S2DFS: Analysis of temporal changes of drifting subpulses (2009)
Serylak, M., Stappers, B. W., Weltevrede, P.
We introduce a new technique, called the Sliding Two-Dimensional Fluctuation Spectrum, used for detecting and characterising the temporal changes of drifting subpulses from radio pulsars. The method...
Further Searches for RRATs in the Parkes Multi-Beam Pulsar Survey (2009)
Keane, E. F., Ludovici, D. A., Eatough, R. P., Kramer, M., Lyne, A. G., McLaughlin, M. A., ...
We describe the steps involved in performing searches for sources of transient radio emission such as Rotating Radio Transients (RRATs), and present 10 new transient radio sources discovered in a...
Unusual glitch activity in the RRAT J1819-1458: an exhausted magnetar? (2009)
Lyne, A. G., McLaughlin, M. A., Keane, E. F., Kramer, M., Espinoza, C. M., Stappers, B. W., ...
We present an analysis of regular timing observations of the high-magnetic-field Rotating Radio Transient (RRAT) J1819$-$1458 obtained using the 64-m Parkes and 76-m Lovell radio telescopes over the...
Lazaridis, K., Wex, N., Jessner, A., Kramer, M., Stappers, B. W., Janssen, G. H., ...
We present results from the high precision timing analysis of the pulsar-white dwarf (WD) binary PSR J1012+5307 using 15 years of multi-telescope data. Observations were performed regularly by the...
Phase-resolved Faraday rotation in pulsars (2009)
Noutsos, A., Karastergiou, A., Kramer, M., Johnston, S., Stappers, B. W.
We have detected significant Rotation Measure variations for 9 bright pulsars, as a function of pulse longitude. An additional sample of 10 pulsars showed a rather constant RM with phase, yet a small...
A new perspective on GCRT J1745-3009 (2009)
Spreeuw, H., Scheers, B., Braun, R., Stappers, B. W., ...
Two WSRT observations were performed and five archival VLA data were reduced in order to redetect the enigmatic radio transient GCRT J1745-3009. The source was not redetected. We were, however, able...
The Radio Sky on Short Timescales with LOFAR: Pulsars and Fast Transients (2009)
Hessels, J. W. T., Stappers, B. W., Van Leeuwen, J.
LOFAR, the "low-frequency array", will be one of the first in a new generation of radio telescopes and Square Kilometer Array (SKA) pathfinders that are highly flexible in capability because they are...
Discovery and timing of the first 8gr8 Cygnus survey pulsars (2009)
Janssen, G. H., Stappers, B. W., Braun, R., Van Straten, W., Edwards, R. T., Rubio-Herrera, E., ...
Since 2004 we have been carrying out a pulsar survey of the Cygnus region with the Westerbork Synthesis Radio Telescope (WSRT) at a frequency of 328 MHz. The survey pioneered a novel interferometric...
Low frequency observations of millisecond pulsars with the WSRT (2009)
Stappers, B.W., Karappusamy, R., Hessels, J.W.T.
With LOFAR beginning operation in 2008 there is huge potential for studying pulsars with high signal to noise at low frequencies. We present results of observations made with the Westerbork Synthesis...
Pulsed gamma-rays from PSR J2021+3651 with the Fermi large area telescope (2009)
Abdo, A. A., Ackermann, M., Ajello, M., Atwood, W. B., Baldini, L., Ballet, J., ...
A population of gamma-ray millisecond pulsars seen with the Fermi large area telescope (2009)
Abdo, A. A., Ackermann, M., Ajello, M., Atwood, W. B., Axelsson, M., Baldini, L., ...
Arecibo pulsar survey using ALFA: probing radio pulsar intermittency and transients (2009)
Deneva, J. S., Cordes, J. M., McLaughlin, M. A., Nice, D. J., Lorimer, D. R., Crawford, F., ...
We present radio transient search algorithms, results, and statistics from the ongoing Arecibo Pulsar ALFA (PALFA) survey of the Galactic plane. We have discovered seven objects through a search for...
Arecibo pulsar survey using ALFA: probing radio pulsar intermittency and transients (2009)
Deneva, J. S., Cordes, J. M., McLaughlin, M. A., Nice, D. J., Lorimer, D. R., Crawford, F., ...
We present radio transient search algorithms, results, and statistics from the ongoing Arecibo Pulsar ALFA (PALFA) survey of the Galactic plane. We have discovered seven objects through a search for...
Simultaneous multi-frequency single-pulse properties of AXP XTE J1810-197 (2008)
Serylak, M., Stappers, B. W., Weltevrede, P., Kramer, M., Jessner, A., Lyne, A. G., ...
We have used the 76-m Lovell, 94-m equivalent WSRT and 100-m Effelsberg radio telescopes to investigate the simultaneous single-pulse properties of the radio emitting magnetar AXP XTE J1810-197 at...
Arecibo Pulsar Survey Using ALFA. III. Probing Radio Pulsar Intermittency and Transients (2008)
Deneva, J. S., Cordes, J. M., McLaughlin, M. A., Nice, D. J., Lorimer, D. R., Crawford, F., ...
We present radio transient search algorithms, results, and statistics from the ongoing Arecibo Pulsar ALFA (PALFA) Survey of the Galactic plane. We have discovered seven objects by detecting isolated...
Pulsar Timing for the Fermi Gamma-ray Space Telescope (2008)
Smith, D. A., Guillemot, L., Camilo, F., Cognard, I., Dumora, D., Espinoza, C., ...
We describe a comprehensive pulsar monitoring campaign for the Large Area Telescope (LAT) on the {\em Fermi Gamma-ray Space Telescope} (formerly GLAST). The detection and study of pulsars in gamma...
Multi-telescope timing of PSR J1518+4904 (2008)
Janssen, G. H., Stappers, B. W., Kramer, M., Nice, D. J., Jessner, A., Cognard, I., ...
PSR J1518+4904 is one of only 9 known double neutron star systems. These systems are highly valuable for measuring the masses of neutron stars, measuring the effects of gravity, and testing...
Radio spectrum of the AXP J1810-197 and of its profile components (2008)
Lazaridis, K., Jessner, A., Kramer, M., Stappers, B. W., Lyne, A. G., Jordan, C. A., ...
As part of a European Pulsar Network (EPN) multi-telescope observing campaign, we performed simultaneous multi-frequency observations at 1.4, 4.9 and 8.4 GHz during July 2006 and quasi-simultaneous...
Hessels, J. W. T., Nice, D. J., Gaensler, B. M., Kaspi, V. M., Lorimer, D. R., Champion, D. J., ...
We present the discovery of the Vela-like radio pulsar J1856+0245 in the Arecibo PALFA survey. PSR J1856+0245 has a spin period of 81ms, a characteristic age of 21kyr, and a spin-down luminosity Edot...
An Eccentric Binary Millisecond Pulsar in the Galactic Plane (2008)
Champion, D. J., Ransom, S. M., Lazarus, P., Camilo, F., Bassa, C., Kaspi, V. M., ...
Binary pulsar systems are superb probes of stellar and binary evolution and the physics of extreme environments. In a survey with the Arecibo telescope, we have found PSR J1903+0327, a radio pulsar...
An eccentric binary millisecond pulsar in the Galactic plane (2008)
Champion, D.J., Ransom, S.M., Lazarus, P., Camilo, F., Bassa, C., Kaspi, V.M., ...
Binary pulsar systems are superb probes of stellar and binary evolution and the physics of extreme environments. In a survey with the Arecibo telescope, we have found PSR J1903+ 0327, a radio pulsar...
The discovery of an eccentric millisecond pulsar in the Galactic plane (2008)
Champion, D.J., Ransom, S.M., Lazarus, P., Camilo, F., Kaspi, V.M., Nice, D.J., ...
The evolution of binary systems is governed by their orbital properties and the stellar density of the local environment. Studies of neutron stars in binary star systems offer unique insights into...
Hessels, J.W.T., Nice, D.J., Gaensler, B.M., Kaspi, V.M., Lorimer, D.R., Champion, D.J., ...
We present the discovery of the Vela-like radio pulsar J1856+0245 in the Arecibo PALFA survey. PSR J1856+0245 has a spin period of 81 ms, a characteristic age of 21 kyr, and a spin-down luminosity...
The GBT350 survey of the Northern Galactic Plane for radio pulsars and transients (2008)
Hessels, J.W.T., Ransom, S.M., Kaspi, V.M., Roberts, M.S.E., Champion, D.J., Stappers, B.W.
Using the Green Bank Telescope (GBT) and Pulsar Spigot at 350 MHz, we have surveyed the Northern Galactic Plane for pulsars and radio transients. This survey covers roughly 1000 square degrees of sky...
Multi-telescope timing of PSR J1518+4904 (2008)
Janssen, G.H., Stappers, B.W., Kramer, M., Nice, D.J., Jessner, A., Cognard, I., ...
Context. PSR J1518+4904 is one of only 9 known double neutron star systems. These systems are highly valuable for measuring the masses of neutron stars, measuring the effects of gravity, and testing...
Radio spectrum of the AXP J1810−197 and of its profile components (2008)
Lazaridis, K., Jessner, A., Kramer, M., Stappers, B.W., Lyne, A.G., Jordan, C.A., ...
As part of a European Pulsar Network (EPN) multitelescope observing campaign, we performed simultaneous multifrequency observations at 1.4, 4.9 and 8.4 GHz during 2006 July and quasi-simultaneous...
Low Frequency Observations of Millisecond Pulsars with the WSRT (2007)
Stappers, B. W., Karuppusamy, R., Hessels, J. W. T.
With LOFAR beginning operation in 2008 there is huge potential for studying pulsars with high signal to noise at low frequencies. We present results of observations made with the Westerbork Synthesis...
The GBT350 Survey of the Northern Galactic Plane for Radio Pulsars and Transients (2007)
Hessels, J. W. T., Ransom, S. M., Kaspi, V. M., Roberts, M. S. E., Champion, D. J., Stappers, B. W.
Using the Green Bank Telescope (GBT) and Pulsar Spigot at 350MHz, we have surveyed the Northern Galactic Plane for pulsars and radio transients. This survey covers roughly 1000 square degrees of sky...
Hessels, J. W. T., Stappers, B. W., Rutledge, R. E., Fox, D. B., Shevchuk, A. H.
The ROSAT X-ray source 1RXS J141256.0+792204 has recently been identified as a likely compact object whose properties suggest it could be a very nearby radio millisecond pulsar at d = 80 - 260pc. We...
Weltevrede, P., Stappers, B. W., Edwards, R. T.
A large sample of pulsars has been observed to study their subpulse modulation at an observing wavelength (when achievable) of both 21 and 92 cm using the Westerbork Synthesis Radio Telescope. In...
Pulsed X-ray Emission from Pulsar A in the Double Pulsar System J0737-3039 (2007)
Chatterjee, S., Gaensler, B. M., Melatos, A., Brisken, W. F., Stappers, B. W.
The double pulsar system J0737-3039 is not only a test bed for General Relativity and theories of gravity, but also provides a unique laboratory for probing the relativistic winds of neutron stars....
The main- interpulse interaction of PSR B1702-19 (2007)
Weltevrede, P., Wright, G. A. E., Stappers, B. W.
This paper reports on single-pulse radio observations of PSR B1702-19 and their implications for pulsar emission theories. These observations were made with the Westerbork Synthesis Radio Telescope...
Polarized radio emission from a magnetar (2007)
Kramer, M., Stappers, B. W., Jessner, A., Lyne, A. G., Jordan, C. A.
We present polarization observations of the radio emitting magnetar AXP J1810-197. Using simultaneous multi-frequency observations performed at 1.4, 4.9 and 8.4 GHz, we obtained polarization...
The Geometry of PSR B0031-07 (2007)
Smits, J. M., Mitra, D., Stappers, B. W., Kuijpers, J., Weltevrede, P., Jessner, A., ...
PSR B0031-07 is well known to exhibit three different modes of drifting sub-pulses (mode A, B and C). It has recently been shown that in a multifrequency observation, consisting of 2700 pulses, all...
Glitch observations in slow pulsars (2007)
Janssen, G. H., Stappers, B. W.
We have analyzed 5.5 years of timing observations of 7 ``slowly'' rotating radio pulsars, made with the Westerbork Synthesis Radio Telescope. We present improved timing solutions and 30, mostly small...
Drifting subpulse survey at 21 cm (2007)
Weltevrede, P., Edwards, R. T., Stappers, B. W.
We present the statistical results of a systematic, unbiased search for subpulse modulation of 187 pulsars performed with the Westerbork Synthesis Radio Telescope (WSRT) in the Netherlands at an...
LOFAR: A powerful tool for pulsar studies (2007)
Stappers, B. W., Kramer, M., Stinebring, D., Hessels, J.
The LOw Frequency ARray, LOFAR, will have the sensitivity, bandwidth, frequency range and processing power to revolutionise low-frequency pulsar studies. We present results of simulations that...
The 8gr8 Cygnus survey for new pulsars and RRATs (2007)
Rubio-Herrera, E., Braun, R., Janssen, G., Van Leeuwen, J., Stappers, B. W.
We are currently undertaking a survey to search for new pulsars and the recently found Rotating RAdio Transcients (RRATs) in the Cygnus OB complex. The survey uses the Westerbrok Synthesis Radio...
Weltevrede, P., Stappers, B. W., Rankin, J. M., Wright, G. A. E.
We present a detailed study of the single radio pulses of PSR B0656+14. The emission can be characterized by two separate populations of pulses: bright pulses have a narrow ``spiky'' appearance in...
The binary pulsar PSR J1811-1736: evidence of a low amplitude supernova kick (2006)
Corongiu, A., Kramer, M., Stappers, B. W., Lyne, A. G., Jessner, A., Possenti, A., ...
Aims: The binary pulsar PSR J1811-1736 has been identified, since its discovery, as a member of a double neutron star system. Observations of such binary pulsars allow the measurement of general...
The bright spiky emission of pulsar B0656+14 (2006)
Weltevrede, P., Wright, G. A. E., Stappers, B. W., Rankin, J. M.
We present a detailed study of the single radio pulses of PSR B0656+14, a pulsar also known to be a strong pulsed source of high-energy emission. Despite the extensive studies at high-energy...
30 Glitches in slow pulsars (2006)
Janssen, G. H., Stappers, B. W.
We have analyzed 5.5 years of timing observations of 7 'slowly' rotating radio pulsars, made with the Westerbork Synthesis Radio Telescope. We present improved timing solutions and 30, mostly small,...
Is pulsar B0656+14 a very nearby RRAT source? (2006)
Weltevrede, P., Stappers, B. W., Rankin, J. M., Wright, G. A. E.
The recently discovered RRAT sources are characterized by very bright radio bursts which, while being periodically related, occur infrequently. We find bursts with the same characteristics for the...
Statistics of the drifting subpulse phenomenon (2006)
Weltevrede, P., Edwards, R. T., Stappers, B. W.
We present the statistical results of a systematic, unbiased search for subpulse modulation of 187 pulsars performed with the Westerbork Synthesis Radio Telescope (WSRT) in the Netherlands at an...
Arecibo and the ALFA Pulsar Survey (2006)
Van Leeuwen, J., Cordes, J. M., Lorimer, D. R., Freire, P. C. C., Camilo, F., Stairs, I. H., ...
The recently started Arecibo L-band Feed Array (ALFA) pulsar survey aims to find ~1000 new pulsars. Due to its high time and frequency resolution the survey is especially sensitive to millisecond...
The bright spiky emission of pulsar B0656+14 (2006)
Weltevrede, P., Wright, G.A.E., Stappers, B.W., Rankin, J.M.
Frequency dependence of orthogonal polarisation modes in pulsars (2006)
Smits, J.M., Stappers, B.W., Edwards, R.T., Kuipers, J., Ramachandran, R.
Is Pulsar B0656+14 a Very Nearby Rotating Radio Transient? (2006)
Weltevrede, P., Stappers, B.W., Rankin, J.M., Wright, G.A.E.
The recently discovered RRAT sources are characterized by very bright radio bursts that, while being periodically related, occur infrequently. We find bursts with the same characteristics for the...
Glitch Observations In Slow Pulsars (2006)
We have analyzed 5.5 years of timing observations of 7 ``slowly'' rotating radio pulsars, made with the Westerbork Synthesis Radio Telescope. We present improved timing solutions and 30, mostly...
The 8gr8 Cygnus Survey for New Pulsars and RRATs (2006)
Rubio-Herrera, E., Braun, R., Janssen, G., Leeuwen, J. Van, Stappers, B.W.
We are currently undertaking a survey to search for new pulsars and the recently found Rotating RAdio Transcients (RRATs) in the Cygnus OB complex. The survey uses the Westerbrok Synthesis Radio...
The LOFAR Transients Key Project (2006)
Fender, R.P., Stappers, B.W., Braun, R., Wise, M., Coenen, T., ...
LOFAR, the Low Frequency Array, is a new radio telescope under construction in the Netherlands, designed to operate between 30 and 240 MHz. The Transients Key Project is one of the four Key Science...
Statistics of the Drifting Subpulse Phenomenon (2006)
Weltevrede, P., Edwards, R.T., Stappers, B.W.
We present the statistical results of a systematic, unbiased search for subpulse modulation of Pulsars pulsars performed with the Westerbork Synthesis Radio Telescope (WSRT) in the Netherlands at an...
Arecibo and the ALFA Pulsar Survey (2006)
Leeuwen, J. Van, Cordes, J.M., Lorimer, D.R., Freire, P.C.C., Camilo, F., Stairs, I.H., ...
The recently started Arecibo L-band Feed Array (ALFA) pulsar survey aims to find ¿ 1000 new pulsars. Due to its high time and frequency resolution the survey is especially sensitive to millisecond...
The European Pulsar Timing Array (2006)
Stappers, B.W., Kramer, M., Lyne, A.G., D'Amico, N., Jessner, A.
The timing of radio pulsars provides a tool for studying a wide range of fundamental physical and astrophysical problems. The best results are obtained by regular, frequent timing observations of a...
High Time Resolution Low-Frequency Pulsar Studies (2006)
Low frequency observations of radio pulsars have, to a certain extent, fallen out of favour in recent times. This is despite exciting and interesting work in Russia, Ukraine and India. The move to...
Arecibo Pulsar Survey Using ALFA. II. The Young, Highly Relativistic Binary Pulsar J1906+0746 (2006)
Lorimer, D.R., Stairs, I.H., Cordes, J.M., Camilo, F., Faulkner, A.J., ...
We report the discovery of PSR J1906+0746, a young 144 ms pulsar in a highly relativistic 3.98 hr orbit with an eccentricity of 0.085 and expected gravitational wave coalescence time of ~300 Myr. The...
Blazek, J.A., Gaensler, B.M., Chatterjee, S., Swaluw, E. Van Der, Camilo, F., Stappers, B.W.
``The Duck'' is a complicated nonthermal radio system, consisting of the energetic radio pulsar B1757-24, its surrounding pulsar wind nebula G5.27-0.90, and the adjacent supernova remnant (SNR)...
Frequency dependence of orthogonal polarisation modes in pulsars (2005)
Smits, J. M., Stappers, B. W., Edwards, R. T., Kuijpers, J., Ramachandran, R.
We have carried out a study of the orthogonal polarisation mode behaviour as a function of frequency of 18 pulsars, using average pulsar data from the European Pulsar Network (EPN). Assuming that the...
Blazek, J. A., Gaensler, B. M., Chatterjee, S., Camilo, F., Stappers, B. W.
"The Duck" is a complicated non-thermal radio system, consisting of the energetic radio pulsar B1757-24, its surrounding pulsar wind nebula G5.27-0.90 and the adjacent supernova remnant (SNR)...
The young, highly relativistic binary pulsar J1906+0746 (2005)
Lorimer, D. R., Stairs, I. H., Freire, P. C. C., Cordes, J. M., Camilo, F., Faulkner, A. J., ...
We report the discovery of PSR J1906+0746, a young 144-ms pulsar in a highly relativistic 3.98-hr orbit with an eccentricity of 0.085 and expected gravitational wave coalescence time of 300 Myr. The...
The subpulse modulation properties of pulsars at 21 cm (2005)
Weltevrede, P., Edwards, R. T., Stappers, B. W.
We present the results of a systematic, unbiased search for subpulse modulation of 187 pulsars performed with the Westerbork Synthesis Radio Telescope (WSRT) in the Netherlands at an observing...
Pulsars as Tools for Fundamental Physics and Astrophysics (2005)
Cordes, J. M., Kramer, M., Lazio, T. J. W., Stappers, B. W., Backer, D. C., Johnston, S.
The sheer number of pulsars discovered by the SKA, in combination with the exceptional timing precision it can provide, will revolutionize the field of pulsar astrophysics. The SKA will provide a...
Kaspi, V. M., Bailes, M., Manchester, R. N., Stappers, B. W., Sandhu, J., Navarro, J., ...
We report on the discovery and follow-up timing observations of a 63-ms radio pulsar, PSR J1105-6107. We show that the pulsar is young, having a characteristic age of only 63kyr. We consider its...
Classical Spin-Orbit Coupling and Periastron Advance in a Binary Pulsar (2004)
Kaspi, V. M., Bailes, M., Manchester, R. N., Stappers, B. W., Bell, J. F.
We report on radio timing observations of PSR J0045-7319, and eccentric pulsar/B star 51-day binary in the Small Magellanic Cloud. Significant deviations from a simple Keplerian orbit, observed as...
Strong-Field Tests of Gravity Using Pulsars and Black Holes (2004)
Kramer, M., Backer, D. C., Cordes, J. M., Lazio, T. J. W., Stappers, B. W., Johnston, S.
The sensitivity of the SKA enables a number of tests of theories of gravity. A Galactic Census of pulsars will discover most of the active pulsars in the Galaxy beamed toward us. In this census will...
Celestial position of the companion of PSR J1740-5340 (2004)
We present optical astrometry of archival ground and space based imaging of the companion to PSR J1740-5340. The optical position of the companion is significantly offset from the timing position of...
Ellipticity and Deviations from Orthogonality in the Polarization Modes of PSR B0329+54 (2004)
Edwards, R. T., Stappers, B. W.
We report on an analysis of the polarization of single pulses of PSR B0329+54 at 328 MHz. We find that the distribution of polarization orientations in the central component diverges strongly from...
Chandra and RXTE studies of the X-ray/gamma-ray millisecond pulsar PSR J0218+4232 (2004)
Kuiper, L., Hermsen, W., Stappers, B.W.
We report on high-resolution spatial and timing observations of the millisecond pulsar PSR J0218+4232 performed with the Chandra X-ray Observatory (CXO) and the Rossi X-ray Timing Explorer (RXTE)....
Ellipticity and deviations from orthogonality in the polarization modes of PSR B0329+54 (2004)
We report on an analysis of the polarization of single pulses of PSR B0329+54 at 328 MHz. We find that the distribution of polarization orientations in the central component diverges strongly from...
Celestial position of the companion of PSR J1740-5340 (2004)
We present optical astrometry of archival ground and space based imaging of the companion to PSR J1740-5340. The optical position of the companion is significantly offset from the timing position of...
The radio counterpart of IGR J00291+5934 (2004)
Fender, R.P., Bruyn, G. De, Pooley, G., Stappers, B.W.
We report further observations of the proposed radio counterpart to the accreting millisecond X-ray pulsar IGR J00291+5934. Following the report of a possible ~1.1 mJy radio counterpart at 15 GHz on...
Strong-field tests of gravity using pulsars and black holes (2004)
Kramer, M., Backer, D.C., Cordes, J.M., Lazio, T.J.W., Stappers, B.W., Johnston, S.
The sensitivity of the SKA enables a number of tests of theories of gravity. A Galactic Census of pulsars will discover most of the active pulsars in the Galaxy beamed toward us. In this census will...
Pulsars as tools for fundamental physics & astrophysics (2004)
Cordes, J.M., Kramer, M., Lazio, T.J.W., Stappers, B.W., Backer, D.C., Johnston, S.
The sheer number of pulsars discovered by the SKA, in combination with the exceptional timing precision it can provide, will revolutionize the field of pulsar astrophysics. The SKA will provide a...
The phase of the radio and X-ray pulses of PSR B1937+21 (2004)
Cusumano, G., Hermsen, W., Kramer, M., Kuiper, L., Löhmer, O., Massaro, E., ...
Weltevrede, P., Stappers, B. W., Edwards, R. T.
The Petrova (2000) model to calculate pulse profiles is extended to a variable emission height model to make it physically self-consistent. In this context variable means that the emission height is...
The phase of the radio and X-ray pulses of PSR B1937+21 (2003)
Cusumano, G., Hermsen, W., Kramer, M., Kuiper, L., Lohmer, O., Massaro, E., ...
We present timing and spectral results of PSR B1937+21, the fastest known millisecond pulsar (P about 1.56 ms), observed with RXTE. The pulse profile, detected up to 20 keV, shows a double peak with...
The frequency-dependence of drifting subpulse patterns (2003)
Edwards, R. T., Stappers, B. W.
Drifting subpulse patterns in pulsar signals are frequently interpreted in terms of a model in which a rotating ring of sparks on the polar cap gives rise to emission from regions of the...
On the Search for Coherent Radiation from Radio Pulsars (2003)
Smits, J. M., Stappers, B. W., Macquart, J-P., Ramachandran, R., Kuijpers, J.
We have examined data from pulsars B0950+08 and B0329+54 for evidence of temporally coherent radiation using the modified coherence function (MCF) technique of Jenet et al. (2001). We consider the...
Jonker, P. G., Nelemans, G., Wang, Z., Kong, A. K. H., Chakrabarty, D., Garcia, M., ...
We have obtained optical and near-infrared images of the field of the accreting millisecond X-ray pulsar XTE J1751-305. There are no stars in the 0.7'' error circle (0.7'' is the overall uncertainty...
Pulse-to-pulse intensity modulation and drifting subpulses in recycled pulsars (2003)
Edwards, R. T., Stappers, B. W.
We report the detection of pulse-to-pulse periodic intensity modulations, in observations of recycled pulsars. Even though the detection of individual pulses was generally not possible due to their...
An X-ray Nebula Associated with the Millisecond Pulsar B1957+20 (2003)
Stappers, B. W., Gaensler, B. M., Kaspi, V. M., Lewin, W. H. G.
We have detected an x-ray nebula around the binary millisecond pulsar B1957+20. A narrow tail, corresponding to the shocked pulsar wind, is seen interior to the known H-alpha bow shock and proves the...
Unusual Subpulse Modulation in PSR B0320+39 (2003)
Edwards, R. T., Stappers, B. W.
We report on an analysis of the drifting subpulses of PSR B0320+39 that indicates a sudden step of ~180 degrees in subpulse phase near the centre of the pulse profile. The phase step, in combination...
Enhanced Optical Emission from the Crab Pulsar (2003)
We have detected an enhancement in the optical emission from the Crab pulsar which is correlated with the presence of the giant radio pulses. Coincident optical pulses were found to be on average 3%...
On the search for coherent radiation from radio pulsars (2003)
Smits, J.M., Stappers, B.W., Macquart, J.P., Ramachandran, R., Kuijpers, J.
Enhanced Optical Emission During Crab Giant Radio Pulses (2003)
Shearer, A., Stappers, B.W., O'Connor, P., Golden, A., Strom, R.G., Redfern, M., ...
The phase of the radio and X-ray pulses of PSR B1937+21 (2003)
Cusumano, G., Hermsen, W., Kramer, M., Kuiper, L., Lohmer, O., Massaro, E., ...
An X-ray nebula associated with the millisecond pulsar B1957+20 (2003)
Stappers, B.W., Gaensler, B.M., Kaspi, V.M., Klis, M. Van Der, Lewin, W.H.G.
Originally published by the American Association for the Advancement of Science http://www.jstor.org/journals/aaas.html
The phase of the radio and X-ray pulses of PSR B1937+21 (2003)
Cusumano, G., Hermsen, W., Kramer, M., Kuiper, L., Löhmer, O., Massaro, E., ...
We present timing and spectral results of PSR B1937+21, the fastest known millisecond pulsar ( P similar or equal to 1.56 ms), observed with RXTE. The pulse profile, detected up to similar to 20 keV,...
Probing drifting and nulling mechanisms through their interaction in PSR B0809+74 (2002)
Stappers, B. W., Ramachandran, R., Rankin, J. M.
Both nulling and subpulse drifting are poorly understood phenomena. We probe their mechanisms by investigating how they interact in PSR B0809+74. We find that the subpulse drift is not aliased but...
Drifting Sub-Pulse Analysis Using the Two-Dimensional Fourier Transform (2002)
Edwards, R. T., Stappers, B. W.
The basic form of drifting sub-pulses is that of a periodicity whose phase depends (approximately linearly) on both pulse longitude and pulse number. As such, we argue that the two-dimensional...
Null-induced mode changes in PSR B0809+74 (2002)
Kouwenhoven, M. L. A., Ramachandran, R., Rankin, J. M., Stappers, B. W.
We have found that there are two distinct emission modes in PSR B0809+74. Beside its normal and most common mode, the pulsar emits in a significantly different quasi-stable mode after most or...
Proper Motion Measurements of Pulsar B1951+32 in the Supernova Remnant CTB 80 (2002)
Migliazzo, J. M., Gaensler, B. M., Backer, D. C., Stappers, B. W., Strom, R. G.
Using the Very Large Array and the Pie Town antenna, we have measured the position of the radio pulsar B1951+32 relative to nearby background radio sources at four epochs between 1989 and 2000. These...
PSR B1951+32 and SNR CTB 80: Association Confirmed (2002)
Migliazzo, J.M., Gaensler, B.M., Backer, D.C., Stappers, B.W., Strom, R.G., Swaluw, E. Van Der
Proper-Motion Measurements of Pulsar B1951+32 in the Supernova Remnant CTB 80 (2002)
Migliazzo, J.M., Gaensler, B.M., Backer, D.C., Stappers, B.W., Swaluw, E. Van Der, Strom, R.G.
Searching for pulsars in close circular binary systems (2002)
Jouteux, S., Ramachandran, R., Stappers, B.W., Jonker, P.G., Klis, M. Van Der
PuMa, a digital Pulsar Machine (2002)
Voute, J.L.L., Kouwenhoven, M.L.A., Haren, P.C. Van, Langerak, J.J., Stappers, B.W., Driesens, D., ...
Null-induced mode changes in PSR B0809+74 (2002)
Kouwenhoven, M.L.A., Ramachandran, R., Rankin, J.M., Stappers, B.W.
A WSRT search for millisecond pulsars (2002)
Tian, W. W., Strom, R. G., Stappers, B. W., Zhang, X. Z., Wu, X. J., Ramachandran, R.
Searching for Pulsars in Close Binary Systems (2001)
Jouteux, S., Ramachandran, R., Stappers, B. W., Jonker, P.
We present a detailed mathematical analysis of the Fourier response of binary pulsar signals whose frequencies are modulated by circular orbital motion. The fluctuation power spectrum of such signals...
Ramachandran, R., Rankin, Joanna M., Stappers, B. W., Kouwenhoven, M. L. A.
Polarization-angle density displays are given for pulsars B0809+74 and B2303+30, which exhibit no evidence of the systematic polarization-angle rotation within individual subpulses previously...
Intrinsic and reprocessed optical emission from the companion to PSR J2051-0827 (2001)
Stappers, B.W., Kerkwijk, M.H. Van, Bell, J.F., Kulkarni, S.R.
Chandra Imaging of the Black Widow Pulsar B1957+20 (2001)
Gaensler, B.M., Stappers, B.W., Kaspi, V.M., Klis, M. Van Der, Lewin, W.H.G.
Search for discrete refractive scattering events (2000)
Ramachandran, R., Deshpande, A.A., Stappers, B.W.
We have searched for discrete refractive scattering events (including effects due to possible non-multiple diffractive scattering) at meter wavelengths in the direction of two close by pulsars...
Search for Discrete Refractive Scattering Events (2000)
Ramachandran, R., Deshpande, A. A., Stappers, B. W.
We have searched for discrete refractive scattering events (including effects due to possible non-multiple diffractive scattering) at meter wavelengths in the direction of two close by pulsars...
Glitches in Southern Pulsars (2000)
Wang, N., Manchester, R. N., Pace, R. T., Bailes, M., Kaspi, V. M., Stappers, B. W., ...
Timing observations of 40 mostly young pulsars using the ATNF Parkes radio telescope between 1990 January and 1998 December are reported. In total, 20 previously unreported glitches and ten other...
Limits on radio emission from pulsar wind nebulae (2000)
Gaensler, B. M., Stappers, B. W., Frail, D. A., Moffett, D. A., Johnston, S., Chatterjee, S.
We report on a sensitive survey for radio pulsar wind nebulae (PWN) towards 27 energetic and/or high velocity pulsars. Observations were carried out at 1.4 GHz using the Very Large Array and the...
PuMa, the new Dutch Pulsar Machine (2000)
Kouwenhoven, M.B.N., Haren, P.C. Van, Driesens, D., Langerak, J.J., Beijaard, T.D., Voute, J.L.L., ...
Millisecond Pulsars and a WSRT Search for Candidates (2000)
Tian, WW., Strom, R.G., Stappers, B.W., Zhang, X., Wu, X.J., Ramachandran, R.
Glitches in southern pulsars (2000)
Wang, N., Manchester, R.N., Pace, R.T., Bailes, M., Kaspi, V.M., Stappers, B.W., ...
Limits on radio emission from pulsar wind nebulae (2000)
Gaensler, B.M., Stappers, B.W., Frail, D.A., Moffet, D.A., Johnston, S., Chatterjee, S.
Glitches in southern pulsars (2000)
Wang, N., Manchester, Richard N., Pace, R., Bailes, Matthew, Kaspi, Victoria M., Stappers, B. W., ...
Timing observations of 40 mostly young pulsars using the ATNF Parkes radio telescope between 1990 January and 1998 December are reported. In total, 20 previously unreported glitches and 10 other...
Search for single scattering events (2000)
Ramachandran, R., Deshpande, A.A., Stappers, B.W.
Restricted Access. Pulsar Astronomy - 2000 and Beyond, ASP Conference Series, Vol. 202; Proceedings of the 177th Colloquium of the IAU held in Bonn, Germany, 30 August - 3 September 1999. (San...
Glitches in southern pulsars (2000)
Wang, N., Manchester, Richard N., Pace, R., Bailes, Matthew, Kaspi, Victoria M., Stappers, B. W., ...
Timing observations of 40 mostly young pulsars using the ATNF Parkes radio telescope between 1990 January and 1998 December are reported. In total, 20 previously unreported glitches and 10 other...
Glitches in southern pulsars (2000)
Wang, N., Manchester, Richard N., Pace, R., Bailes, Matthew, Kaspi, Victoria M., Stappers, B. W., ...
Timing observations of 40 mostly young pulsars using the ATNF Parkes radio telescope between 1990 January and 1998 December are reported. In total, 20 previously unreported glitches and 10 other...
Glitches in southern pulsars (2000)
Wang, N., Manchester, Richard N., Pace, R., Bailes, Matthew, Kaspi, Victoria M., Stappers, B. W., ...
Timing observations of 40 mostly young pulsars using the ATNF Parkes radio telescope between 1990 January and 1998 December are reported. In total, 20 previously unreported glitches and 10 other...
Glitches in southern pulsars (2000)
Wang, N., Manchester, Richard N., Pace, R., Bailes, Matthew, Kaspi, Victoria M., Stappers, B. W., ...
Timing observations of 40 mostly young pulsars using the ATNF Parkes radio telescope between 1990 January and 1998 December are reported. In total, 20 previously unreported glitches and 10 other...
Transient radio emisison from SAX J1808.4-3658 (1999)
Gaensler, B. M., Stappers, B. W., Getts, T. J.
We report on the detection of radio emission from the accretion-powered X-ray millisecond pulsar SAX J1808.4-3658, using the Australia Telescope Compact Array. We detected a ~0.8 mJy source at the...
A deep search for pulsar wind nebulae using pulsar gating (1999)
Stappers, B. W., Gaensler, B. M., Johnston, S.
Using the Australia Telescope Compact Array (ATCA) we have imaged the fields around five promising pulsar candidates to search for radio pulsar wind nebulae (PWNe). We have used the ATCA in its...
Millisecond pulsar velocities (1999)
Toscano, M., Sandhu, J.S., Bailes, M., Manchester, R., Britton, M.C., Kulkarni, S., ...
Millisecond Pulsar Velocities (1998)
Toscano, M., Sandhu, J. S., Bailes, M., Manchester, R. N., Britton, M. C., Kulkarni, S. R., ...
We present improved timing parameters for 13 millisecond pulsars (MSPs) including 9 new proper motion measurements. These new proper motions bring to 23 the number of MSPs with measured transverse...
A search for pulsar wind nebulae using pulsar gating (1998)
Gaensler, B. M., Stappers, B. W., Frail, D. A., Johnston, S.
Previous searches for radio pulsar wind nebulae (PWN) suggest that only the youngest and most energetic pulsars power PWN. However the selection effects associated with such searches are severe, in...
The Orbital Evolution and Proper Motion of PSR J2051-0827 (1998)
Stappers, B. W., Bailes, M., Manchester, R. N., Sandhu, J. S., Toscano, M.
We have carried out high-precision timing observations of the eclipsing binary PSR J2051-0827 in the 3.3 years since its discovery. These data indicate that the orbital period is decreasing at a rate...
An unusual pulsar wind nebula associated with PSR B0906-49 (1998)
Gaensler, B. M., Stappers, B. W., Frail, D. A., Johnston, S.
We report on Australia Telescope Compact Array observations of the ~10^5 yr old pulsar PSR B0906-49. In an image containing only off-pulse emission, we find a weak, slightly extended source...
Timing models for the long-orbital period binary pulsar PSR B1259-63 (1998)
Wex, N., Johnston, S., Manchester, R. N., Lyne, A. G., Stappers, B. W., Bailes, M.
The pulsar PSR B1259-63 is in a highly eccentric 3.4-yr orbit with the Be star SS 2883. Timing observations of this pulsar, made over a 7-yr period using the Parkes 64-m radio telescope, cover two...
The light curve of the companion to PSR J2051-0827 (1998)
Stappers, B.W., Kerkwijk, M.H. Van, Lane, B.F., Kulkarni, S.R.
Discovery of the Young, Energetic Radio Pulsar PSR J1105-6107 (1997)
Kaspi, V. M., Bailes, M., Manchester, R. N., Stappers, B. W., Sandhu, J. S., Navarro, J., ...
We report the discovery and follow-up timing observations of the 63 ms radio pulsar, PSR J1105-6107. The pulsar is young, having a characteristic age of only 63 kyr and, from its dispersion measure,...
PSR J0045-7319: A DUAL-LINE BINARY RADIO PULSAR (1995)
Bell, J. F., Bessell, M. S., Stappers, B. W., Bailes, M., Kaspi, V. M.
Binary radio pulsars are superb tools for mapping binary orbits, because of the precision of the pulse timing method (Taylor and Weisberg 1989). To date, all orbital parameters for binary pulsars...