A very rare triple-peaked type-I X-ray burst in the low-mass X-ray binary 4U 1636-53 (2009)
Zhang, Guobao, Mendez, Mariano, Altamirano, Diego, Belloni, Tomaso M., Homan, Jeroen
We have discovered a triple-peaked X-ray burst from the low-mass X-ray binary (LMXB) 4U 1636-53 with the Rossi X-ray Timing Explorer (RXTE). This is the first triple-peaked burst reported from any...
Hiemstra, Beike, Soleri, Paolo, Mendez, Mariano, Belloni, Tomaso, Mostafa, Reham, Wijnands, Rudy
We analyzed simultaneous archival XMM-Newton and RXTE observations of the X-ray binary and black hole candidate Swift J1753.5-0127. In a previous analysis of the same data a soft thermal component...
XEUS: the physics of the hot evolving universe (2009)
Arnaud, Monique, Barcons, Xavier, Barret, Didier, Bautz, Marshall, Bellazzini, Ronaldo, Bleeker, Johan, ...
Kong, Albert K. H., Miller, Jon M., Mendez, Mariano, Cottam, Jean, Lewin, Walter H. G., Paerels, Frederik, ...
During a 200 ks observation with the XMM-Newton Reflection Grating Spectrometer, we detected 16 type-I X-ray bursts from GS 1826-24. We combined the burst spectra in an attempt to measure the...
Mendez, Mariano, Belloni, Tomaso
There is a general consensus that the frequencies of the kilohertz Quasi-Periodic Oscillations (kHz QPOs) in neutron-star low-mass X-ray binaries are directly linked to the spin of the neutron star....
RossiXTE monitoring of 4U 1636-53: I. Long-term evolution and kHz Quasi-Periodic Oscillations (2007)
Belloni, Tomaso, Homan, Jeroen, Motta, Sara, Ratti, Eva, Mendez, Mariano
We have monitored the atoll-type neutron star low-mass X-ray binary 4U 1636-53 with the Rossi X-Ray Timing Explorer (RXTE) for more than 1.5 years. Our campaign consisted of short (~2 ks) pointings...
The elusive Innermost Stable Circular Orbit: Now you see it, now you don't (2006)
I study the behaviour of the maximum rms fractional amplitude, $r_{\rm max}$ and the maximum coherence, $Q_{\rm max}$, of the kilohertz quasi-periodic oscillations (kHz QPOs) in a dozen low-mass...
Homan, Jeroen, Van Der Klis, Michiel, Wijnands, Rudy, Belloni, Tomaso, Fender, Rob, Klein-Wolt, Marc, ...
(Abridged) We report on ten weeks of RXTE observations of the X-ray transient XTE J1701-462. Comparisons with other sources suggest it had all the characteristics of the neutron star Z sources (the...
I study the behaviour of the maximum rms fractional amplitude, $r_{\rm max}$ and the maximum coherence, $Q_{\rm max}$, of the kilohertz quasi-periodic oscillations (kHz QPOs) in a dozen low-mass...
The distribution of kHz QPO frequencies in bright LMXBs (2005)
Belloni, Tomaso, Mendez, Mariano, Homan, Jeroen
We analyzed all published frequencies, nu_1 and nu_2, of the twin kilohertz quasi-periodic oscillations (kHz QPOs) in bright neutron star low-mass X-ray binaries. The two frequencies are well...
The distribution of kHz QPO frequencies in Sco X-1 (2004)
Belloni, Tomaso, Mendez, Mariano, Homan, Jeroen
The frequencies of kHz Quasi-Periodic Oscillations in the bright Low-Mass X-ray Binary Sco X-1 have been reported to appear preferentially in a 3:2 ratio. We show that a proper statistical analysis...
The continued spectral evolution of the neutron star RX J0720.4-3125 (2004)
Vink, Jacco, De Vries, Cor, Mendez, Mariano, Verbunt, Frank
We observed the isolated neutron star RX J720.4-3125 with Chandra's Low Energy Transmission Grating Spectrometer, following the XMM-Newton discovery of long term spectral evolution of this source....
Long-term variability in the X-ray emission of RX J0720.4-3125 (2004)
De Vries, Cor P., Vink, Jacco, Mendez, Mariano, Verbunt, Frank
We detect a gradual, long-term change in the shape of the X-ray spectrum of the isolated neutron star RX J0720.4-3125, such that the spectrum of the source can no longer be described as a blackbody...
A transient variable 6 Hz QPO from GX 339-4 (2003)
Nespoli, Elisa, Belloni, Tomaso, Homan, Jeroen, Miller, Jon M., Lewin, Walter H. G., Mendez, Mariano, ...
We report the results of an observation with the Rossi X-ray Timing Explorer of the black hole candidate GX 339-4 during its 2002/2003 outburst. This observation took place during a spectral...
The atoll source states of 4U 1608-52 (2003)
Van Straaten, Steve, Van Der Klis, Michiel, Mendez, Mariano
We have studied the atoll source 4U 1608-52 using a large data set obtained with the Rossi X-ray Timing Explorer. We find that the timing properties of 4U 1608-52 are almost exactly identical to...
Chandra Observations of the Faintest Low-Mass X-ray Binaries (2003)
Wilson, Colleen. A., Patel, Sandeep K., Kouveliotou, Chryssa, Jonker, Peter G., Van Der Klis, Michiel, Lewin, Walter H. G, ...
There exists a group of persistently faint galactic X-ray sources that, based on their location in the galaxy, high L_x/L_opt, association with X-ray bursts, and absence of low frequency X-ray...
Iron Emission Lines from Extended X-ray Jets in SS 433: Reheating of Atomic Nuclei (2002)
Migliari, Simone, Fender, Rob, Mendez, Mariano
Powerful relativistic jets are among the most ubiquitous and energetic observational consequences of accretion around supermassive black holes in active galactic nuclei and neutron stars and...
Fast X-ray Oscillations and General Relativity effects in Neutron star systems (2002)
Kilohertz quasi-periodic oscillations (kHz QPOs) are probably caused by matter in Keplerian orbit at some preferred radius in the accretion disc around a compact star. In a given source, QPO...
Contrary to theoretical expectations, observations with the Rossi X-ray Timing Explorer (RXTE) show that in X-ray binaries timing properties are not uniquely correlated with X-ray luminosity. For...
Kilohertz quasi-periodic oscillations and strong field gravity in X-ray binaries (2002)
In the past five years observations with the Rossi X-ray Timing Explorer have revealed fast quasi-periodic oscillations in the X-ray flux of about 20 X-ray binaries. Thought to originate close to the...
Bleeker, Johan, Mendez, Mariano
XEUS, the X-ray Evolving Universe Spectroscopy mission, is at present an ESA-ISAS initiative for the study of the evolution of the hot Universe in the post-Chandra/XMM-Newton era. The key science...
Jonker, Peter G., Mendez, Mariano, Van Der Klis, Michiel
Recent observations of the low-mass X-ray binary 4U 1636-53 with the Rossi X-ray Timing Explorer show, for the first time, a kiloHertz quasi-periodic oscillation (kHz QPO) peak separation that...
A Polarimetric Survey for Dust in 47 Tucanae (NGC 104) (2002)
Forte, Juan C., Bassino, Lilia P., Vega, E. Irene, Gonzalez, Leonardo J. Pellizza, Cellone, Sergio A., Mendez, Mariano
We present linear polarization in the V band for 77 stars in the field of the globular cluster 47 Tucanae (NGC 104), and for 14 bright-star-free regions, located along an elliptical isophotal contour...
XMM-Newton observations of the neutron star X-ray transient KS 1731-260 in quiescence (2002)
Wijnands, Rudy, Guainazzi, Matteo, Van Der Klis, Michiel, Mendez, Mariano
We report on XMM-Newton observations performed on 2001 September 13-14 of the neutron star X-ray transient KS 1731-260 in quiescence. The source was detected at an unabsorbed 0.5-10 keV flux of only...
The erratic luminosity behavior of SAX J1808.4-3658 during its 2000 outburst (2001)
Wijnands, Rudy, Mendez, Mariano, Markwardt, Craig, Van Der Klis, Michiel, Chakrabarty, Deepto, Morgan, Ed
We report on the highly variable and erratic long-term X-ray luminosity behavior of the only known accretion-driven millisecond X-ray pulsar SAX J1808.4-3658 during its 2000 outburst, as observed...
Wijnands, Rudy, Mendez, Mariano, Miller, Jon M., Homan, Jeroen
We present a detailed study of the 5 Hz quasi-periodic oscillation (QPO) recently discovered in the bright X-ray transient and black-hole candidate GRS 1739-278 (Borozdin & Trudolyubov 2000) during a...
Homan, Jeroen, Van Der Klis, Michiel, Jonker, Peter G., Wijnands, Rudy, Kuulkers, Erik, Mendez, Mariano, ...
We have analyzed ~600 ks of Rossi X-ray Timing Explorer data of the neutron star low-mass X-ray binary and Z source GX 17+2. A study was performed of the properties of the noise components and...
The High-Frequency QPOs in GRS 1915+105 (2001)
Belloni, T., Mendez, Mariano, Sanchez-Fernandez, Celia
We analyzed two 1996 observations of the Galactic Microquasar GRS 1915+105 taken with the Proportional Counter Array on board the Rossi X-ray Timing Explorer. We focus on the properties of the...
Discovery of a kHz QPO in 2S 0918-549 (2001)
Jonker, Peter G., Van Der Klis, Michiel, Homan, Jeroen, Mendez, Mariano, Van Paradijs, Jan, Belloni, Tomaso, ...
We report the discovery of a kilohertz quasi-periodic oscillation (kHz QPO) in the low-mass X-ray binary (LMXB) 2S 0918-549. The kHz QPO has a frequency of 1156+-9 Hz, a FWHM of 70+-20 Hz, and a...
An Atlas of Burst Oscillations and Spectral Properties in 4U 1728-34 (2000)
Van Straaten, Steve, Van Der Klis, Michiel, Kuulkers, Erik, Mendez, Mariano
We study correlations between the burst properties and the position in the color-color diagram of the low mass X-ray binary 4U 1728-34 using 21 bursts found in two data sets obtained with the Rossi...
Jonker, Peter G., Mendez, Mariano, Van Der Klis, Michiel
We report the discovery of a third kilohertz quasi-periodic oscillation (kHz QPO) in the power spectra of the low-mass X-ray binaries 4U 1608-52 (6.3 sigma), 4U 1728-34 (6.0 sigma), and 4U 1636-53...
The Harmonic and Sideband Structure of the Kilohertz Quasi-Periodic Oscillations in Sco X-1 (2000)
Mendez, Mariano, Van Der Klis, Michiel
We use data from the Rossi X-ray Timing Explorer to search for harmonics and sidebands of the two simultaneous kilohertz quasi-periodic oscillations (kHz QPOs) in Sco X-1. We do not detect any of...
Timing the Kilohertz Quasi-Periodic Oscillations in Low-mass X-ray Binaries (2000)
I describe a new technique that we have been using in the past few years to get precise measurements of the frequency separation of the kHz QPOs in some Low-mass X-ray binaries. I show how this...
Mendez, Mariano, Van Der Klis, Michiel, Ford, Eric C.
We study the kilohertz quasi-periodic oscillations (kHz QPOs) in the low-mass X-ray binaries 4U 1728-34, 4U 1608-52, and Aql X-1. Each source traces out a set of nearly parallel lines in a frequency...
Ford, Eric C., Van Der Klis, Michiel, Mendez, Mariano, Wijnands, Rudy, Homan, Jeroen, Jonker, Peter G., ...
We measure simultaneously the properties of the energy spectra and the frequencies of the kilohertz quasi-periodic oscillations (QPOs) in fifteen low mass X-ray binaries covering a wide range of...
The power spectral properties of the Z-source GX 340+0 (2000)
Jonker, Peter G., Van Der Klis, Michiel, Wijnands, Rudy, Homan, Jeroen, Van Paradijs, Jan, Mendez, Mariano, ...
We present an analysis of ~390 ksec of data of the Z source GX 340+0 taken during 24 observations with the Rossi X-ray Timing Explorer satellite. We report the discovery of a new broad component in...
Relations Between Timing Features and Colors in the X-Ray Binary 4U 0614+09 (2000)
Van Straaten, Steve, Ford, Eric C., Van Der Klis, Michiel, Mendez, Mariano, Kaaret, Philip
We study the correlations between timing and X-ray spectral properties in the low mass X-ray binary 4U 0614+09 using a large (265-ks) data set obtained with the Rossi X-ray Timing Explorer. We find...
Homan, Jeroen, Wijnands, Rudy, Van Der Klis, Michiel, Belloni, Tomaso, Van Paradijs, Jan, Klein-Wolt, Marc, ...
We present an analysis of RXTE data of the X-ray transient XTE J1550-564. The source went through several states, which were divided into spectrally soft and hard states. These states showed up as...
Discovery of a ~1 Hz quasi-periodic oscillation in the low-mass X-ray binary 4U 1746-37 (1999)
Jonker, Peter G., Van Der Klis, Michiel, Homan, Jeroen, Wijnands, Rudy, Van Paradijs, Jan, Mendez, Mariano, ...
We have discovered a ~1 Hz quasi-periodic oscillation (QPO) in the persistent X-ray emission and during type I X-ray bursts of the globular cluster source, dipper and low-mass X-ray binary (LMXB) 4U...
Relation between Kilohertz QPOs and Inferred Mass Accretion Rate in 4 LMXBs (1999)
I summarize the available RXTE data of the 4 low-mass X-ray binaries (LMXBs) and Atoll sources Aql X-1, 4U 1728-34, 4U 1608-52, and 4U 1636-53. I concentrate on the relation between the frequencies...
Precise Measurements of the Kilohertz Quasi-Periodic Oscillations in 4U 1728-34 (1999)
Mendez, Mariano, Van Der Klis, Michiel
We have analyzed seventeen observations of the low-mass X-ray binary and atoll source 4U 1728-34, carried out by the Rossi X-ray Timing Explorer in 1996 and 1997. We obtain precise measurements of...
Homan, Jeroen, Mendez, Mariano, Wijnands, Rudy, Van Der Klis, Michiel, Van Paradijs, Jan
We report the discovery of twin kHz quasi-periodic oscillations (QPOs) in the persistent X-ray flux of the new X-ray transient XTE J2123-058. We detected the QPOs in data taken with the proportional...
Ford, Eric C., Van Der Klis, Michiel, Mendez, Mariano, Van Paradijs, Jan, Kaaret, Philip
Using the Rossi X-ray Timing Explorer we have measured lags of the 9 to 33 keV photons relative to the 2 to 9 keV photons in the timing noise between 0.01 and 100 Hz in the accreting neutron stars 4U...
Mendez, Mariano, Van Der Klis, Michiel, Ford, Eric C., Wijnands, Rudy, Van Paradijs, Jan
We present new results based on observations carried out with the Rossi X-ray Timing Explorer during the decay of an outburst of the low-mass X-ray binary (LMXB) and atoll source 4U 1608-52. Our...
Discovery of a Second Kilohertz QPO in the X-ray Binary 4U 1735-44 (1998)
Ford, Eric C., Van Der Klis, Michiel, Van Paradijs, Jan, Mendez, Mariano, Wijnands, Rudy, Kaaret, Philip
In recent observations with the Rossi X-Ray Timing Explorer we have detected two simultaneous quasi-periodic oscillation (QPO) peaks in the low mass X-ray binary and atoll source 4U 1735-44. The...
Mendez, Mariano, Van Der Klis, Michiel, Van Paradijs, Jan
We have analyzed data obtained during two observations with the Rossi X-ray Timing Explorer on January 5 and 8, 1997, of the low-mass X-ray binary (LMXB) and atoll source 4U 1636-53. We measure the...
Mendez, Mariano, Van Der Klis, Michiel, Wijnands, Rudy, Ford, Eric C., Van Paradijs, Jan, Vaughan, Brian A.
We present new Rossi X-ray Timing Explorer observations of the low-mass X-ray binary 4U 1608-52 during the decay of its 1998 outburst. We detect by a direct FFT method the existence of a second...
Discovery of KiloHertz Quasi-Periodic Oscillations in the Z source GX 5-1 (1998)
Wijnands, Rudy, Mendez, Mariano, Van Der Klis, Michiel, Psaltis, Dimitrios, Kuulkers, Erik, Lamb, Frederick K.
We discovered two simultaneous kHz quasi-periodic oscillations (QPOs) in the bright low-mass X-ray binary and Z source GX 5-1 with the Rossi X-ray Timing Explorer. In the X-ray color-color and...
``Canonical'' Black Hole States in the Superluminal Source GRO J1655-40 (1998)
Mendez, Mariano, Belloni, Tomaso, Van Der Klis, Michiel
We analyze RXTE/PCA observations of the black hole candidate and galactic superluminal source GRO J1655-40 during its recent outburst. We show that during its decay to quiescence, GRO J1655-40 goes...
Discovery of KiloHertz Quasi-Periodic Oscillations in 4U 1735-44 (1998)
Wijnands, Rudy, Van Der Klis, Michiel, Mendez, Mariano, Van Paradijs, Jan, Lewin, Walter H. G., Lamb, Frederick K., ...
We discovered a single kHz quasi-periodic oscillation (QPO) near 1150 Hz in the Rossi X-ray Timing Explorer X-ray light curve of the low mass X-ray binary and atoll source 4U 1735-44. The rms...
Absorption dips in GRO J1655-40: mapping the inner accretion disk (1997)
Kuulkers, Erik, Wijnands, Rudy, Belloni, Tomaso, Mendez, Mariano, Van Der Klis, Michiel, Van Paradijs, Jan
Using the RXTE PCA we discovered dips in the X-ray light curves of the black-hole candidate GRO J1655-40 during outburst. They are short (~minute) and deep (down to ~8% of the out-of-dip intensity)....
KiloHertz Quasi-Periodic Oscillations in GX 17+2 (1997)
Wijnands, Rudy, Homan, Jeroen, Van Der Klis, Michiel, Mendez, Mariano, Kuulkers, Erik, Van Paradijs, Jan, ...
We observed the low-mass X-ray binary and Z source GX 17+2 with the Rossi X-ray Timing Explorer during 6-8 Feb 1997, 1-4 Apr 1997, and 26-27 Jul 1997. The X-ray color-color diagram shows a clear Z...
Discovery of microsecond time lags in kilohertz QPO (1997)
Vaughan, Brian A., Van Der Klis, Michiel, Mendez, Mariano, Van Paradijs, Jan, Wijnands, Rudy, Lewin, Walter H. G., ...
Using the Rossi X-ray Timing Explorer we have measured 27 microsecond time delays in 830 Hz quasi-periodic oscillations (QPO) between 4-6 keV and 11-17 keV in 4U 1608-52, with high-energy photons...
The EXOSAT data on GX 339-4: further evidence for an ``intermediate'' state (1996)
Mendez, Mariano, Van Der Klis, Michiel
We have studied the fast timing and spectral behavior of the black hole candidate (BHC) GX 339-4 using all 1 - 20 keV EXOSAT ME data: the July 1983, March 1984, May 1984 and April 1985 observations....