Lister, M. L., Cohen, M. H., Homan, D. C., Kadler, M., Kellermann, K. I., Kovalev, Y. Y., ...
We discuss the jet kinematics of a complete flux-density-limited sample of 135 radio-loud active galactic nuclei (AGN) resulting from a 13 year program to investigate the structure and evolution of...
MOJAVE: Monitoring of Jets in AGN with VLBA Experiments. VII. Blazar Jet Acceleration (2009)
Homan, D. C., Kadler, M., Kellermann, K. I., Kovalev, Y. Y., Lister, M. L., Ros, E., ...
We discuss acceleration measurements for a large sample of extragalactic radio jets from the MOJAVE program which studies the parsec-scale jet structure and kinematics of a complete,...
Fermi Discovery of Gamma-Ray Emission from Ngc 1275 (2009)
Abdo, A. A., Ackermann, M., Ajello, M., Asano, K., Baldini, L., Ballet, J., ...
Fermi Discovery of Gamma-Ray Emission from NGC 1275 (2009)
Aller, H. D., Aller, M. F., Kellermann, K. I., Kovalev, Y. Y., Kovalev, Y. A., ...
We report the discovery of high-energy (E>100 MeV) gamma-ray emission from NGC 1275, a giant elliptical galaxy lying at the center of the Perseus cluster of galaxies, based on observations made with...
Lister, M. L., Aller, H. D., Aller, M. F., Cohen, M. H., Homan, D. C., Kadler, M., ...
We present images from a long-term program (MOJAVE: Monitoring of Jets in active galactic nuclei (AGNs) with VLBA Experiments) to survey the structure and evolution of parsec-scale jet phenomena...
Tozzi, P., Mainieri, V., Rosati, P., Padovani, P., Kellermann, K. I., Fomalont, E., ...
We discuss the X-ray properties of the radio sources detected in a deep 1.4 and 5 GHz VLA Radio survey of the Extended Chandra Deep Field South (E-CDFS). Among the 266 radio sources detected, we find...
On the relation between AGN gamma-ray emission and parsec-scale radio jets (2009)
Kovalev, Y. Y., Aller, H. D., Aller, M. F., Homan, D. C., Kadler, M., Kellermann, K. I., ...
We have compared the radio emission from a sample of parsec-scale AGN jets as measured by the VLBA at 15 GHz, with their associated gamma-ray properties that are reported in the Fermi LAT 3-month...
Lister, M. L., Homan, D. C., Kadler, M., Kellermann, K. I., Kovalev, Y. Y., Ros, E., ...
In its first three months of operations, the Fermi Gamma-Ray Observatory has detected approximately one quarter of the radio-flux-limited MOJAVE sample of bright flat-spectrum active galactic nuclei...
Fermi discovery of gamma-ray emission from NGC 1275 (2009)
Abdo, A. A., Ackermann, M., Ajello, M., Asano, K., Baldini, L., Ballet, J., ...
MOJAVE: Monitoring of Jets in AGN with VLBA Experiments. V. Multi-epoch VLBA Images (2008)
Lister, M. L., Aller, H. D., Aller, M. F., Cohen, M. H., Homan, D. C., Kadler, M., ...
We present images from a long term program (MOJAVE: Monitoring of Jets in AGN with VLBA Experiments) to survey the structure and evolution of parsec-scale jet phenomena associated with bright...
The VLA Survey of the Chandra Deep Field South. IV. Source Population (2008)
Padovani, P., Mainieri, V., Tozzi, P., Kellermann, K. I., Fomalont, E. B., Miller, N., ...
We present a detailed analysis of 256 radio sources from our deep (flux density limit of 42 microJy at the field centre at 1.4 GHz) Chandra Deep Field South 1.4 and 5 GHz VLA survey. The radio...
The VLA Survey of the Chandra Deep Field South: I. Overview of the Radio Data (2008)
Kellermann, K. I., Fomalont, E. B., Mainieri, V., Padovani, P., Rosati, P., Shaver, P., ...
We report 20 and 6 cm VLA deep observations of the CDF-S including the Extended CDF-S. We discuss the radio properties of 266 cataloged radio sources, of which 198 are above a 20 cm completeness...
Mainieri, V., Kellermann, K. I., Fomalont, E. B., Miller, N., Padovani, P., Rosati, P., ...
We present the optical and infrared identifications of the 266 radio sources detected at 20 cm with the Very Large Array in the Chandra Deep Field South (Kellermann et al. 2008). Using deep i-band...
The VLA 1.4GHz Survey of the Extended Chandra Deep Field South: First Data Release (2008)
Miller, Neal A., Fomalont, E. B., Kellermann, K. I., Mainieri, V., Norman, C., Padovani, P., ...
We have observed the Extended Chandra Deep Field South (E-CDF-S) using a mosaic of six deep Very Large Array (VLA) pointings at 1.4GHz. In this paper, we present the survey strategy, description of...
Kinematics of AGN and Quasar Jets (2008)
Kellermann, K. I., Lister, M. L., Homan, D. C., Kovalev, Y. Y., Kadler, M., Cohen, M. C.
The major multi-epoch VLBA programs are described and discussed in terms of relativistic beaming models. Broadly speaking the observed kinematics are consistent with models having a parent population...
The Trails of Superluminal Jet Components in 3C111 (2008)
Kadler, M., Ros, E., Perucho, M., Kovalev, Y. Y., Homan, D. C., Agudo, I., ...
In 1996, a major radio flux-density outburst occured in the broad-line radio galaxy 3C111. It was followed by a particularly bright plasma ejection associated with a superluminal jet component, which...
The trails of superluminal jet components in 3C 111 (2008)
Kadler, M., Ros, E., Perucho, M., Kovalev, Y. Y., Homan, D. C., Agudo, I., ...
In 1996 a major radio flux density outburst occurred in the broad-line radio galaxy 3C 111. It was followed by a particularly bright plasma ejection associated with a superluminal jet component,...
Radio Properties of Quasars and AGN (2007)
By Kellermann, K. I. Kellermann, K. I. Kellermann
. We discuss the compact radio sources associated with quasars and AGN with particular emphasis on the implications of their structure and kinematics for relativistic beaming models. 1. Introduction...
Doppler Boosting, Superluminal Motion, and the Kinematics of AGN Jets (2007)
Kellermann, K. I., Kovalev, Y. Y., Lister, M. L., Homan, D. C., Kadler, M., Cohen, M. H., ...
We discuss results from a decade long program to study the fine-scale structure and the kinematics of relativistic AGN jets with the aim of better understanding the acceleration and collimation of...
The Inner Jet of the Radio Galaxy M87 (2007)
Kovalev, Y. Y., Lister, M. L., Homan, D. C., Kellermann, K. I.
We report new 2 cm VLBA images of the inner radio jet of M87 showing a limb brightened structure and unambiguous evidence for a faint 3 mas long counter-feature which also appears limb brightened....
The micro-Jy Radio Source Population: the VLA-CDFS View (2007)
Padovani, P., Mainieri, V., Tozzi, P., Kellermann, K. I., Fomalont, E. B., Miller, N., ...
We analyse the 267 radio sources from our deep (flux limit of 42 microJy at the field center at 1.4 GHz) Chandra Deep Field South 1.4 and 5 GHz VLA survey. The radio population is studied by using a...
Relativistic beaming and the intrinsic properties of extragalactic radio jets (2007)
Cohen, M. H., Lister, M. L., Homan, D. C., Kadler, M., Kellermann, K. I., Kovalev, Y. Y., ...
Relations between the observed quantities for a beamed radio jet, which are the apparent transverse speed and the apparent luminosity (beta(app), L), and the intrinsic quantities, which are the...
The inner jet of the radio galaxy M87 (2007)
Kovalev, Y. Y., Lister, M. L., Homan, D. C., Kellermann, K. I.
We report new 2 cm VLBA images of the inner radio jet of M87 showing a limb-brightened structure and unambiguous evidence for a faint 3 mas long counterfeature which also appears limb brightened....
Doppler boosting, superluminal motion, and the kinematics of AGN jets (2007)
Kellermann, K. I., Kovalev, Y. Y., Lister, M. L., Homan, D. C., Kadler, M., Cohen, M. H., ...
We discuss results from a decade long program to study the fine-scale structure and the kinematics of relativistic AGN jets with the aim of better understanding the acceleration and collimation of...
The micro-Jy radio source population: the VLA-CDFS view (2007)
Padovani, P., Mainieri, V., Tozzi, P., Kellermann, K. I., Fomalont, E. B., Miller, N., ...
Relativistic Beaming and the Intrinsic Properties of Extragalactic Radio Jets (2006)
Cohen, M. H., Lister, M. L., Homan, D. C., Kadler, M., Kellermann, K. I., Kovalev, Y. Y., ...
Relations between the observed quantities for a beamed radio jet, apparent transverse speed and apparent luminosity (beta_app,L), and the intrinsic quantities, Lorentz factor and intrinsic luminosity...
The Radio/Optical Catalog of the SSA13 Field (2006)
Fomalont, E. B., Kellermann, K. I., Cowie, L., Capak, P., Barger, A. J., Partridge, R. B., ...
We present a 1.4-GHz catalog of 810 radio sources (560 sources in the complete sample) with 1.8" resolution found within a 17' radius in the SSA13 field (RA=13h12m,DEC=42d38'). The radio image from...
Intrinsic brightness temperatures of AGN jets (2006)
Homan, D. C., Kovalev, Y. Y., Lister, M. L., Ros, E., Kellermann, K. I., Cohen, M. H., ...
We present a new method for studying the intrinsic brightness temperatures of the parsec-scale jet cores of active galactic nuclei (AGNs). Our method uses observed superluminal motions and observed...
Intrinsic Brightness Temperatures of AGN Jets (2006)
Homan, D. C., Kovalev, Y. Y., Lister, M. L., Ros, E., Kellermann, K. I., Cohen, M. H., ...
We present a new method for studying the intrinsic brightness temperatures of the parsec-scale jet cores of Active Galactic Nuclei (AGN). Our method uses observed superluminal motions and observed...
Intrinsic brightness temperatures of AGN jets (2006)
Homan, D. C., Kovalev, Y. Y., Lister, M. L., Ros, E., Kellermann, K. I., Cohen, M. H., ...
We present a new method for studying the intrinsic brightness temperatures of the parsec-scale jet cores of active galactic nuclei (AGNs). Our method uses observed superluminal motions and observed...
Intrinsic brightness temperatures of AGN jets (2006)
Homan, D. C., Kovalev, Y. Y., Lister, M. L., Ros, E., Kellermann, K. I., Cohen, M. H., ...
We present a new method for studying the intrinsic brightness temperatures of the parsec-scale jet cores of active galactic nuclei (AGNs). Our method uses observed superluminal motions and observed...
Sub-milliarcsecond Imaging of Quasars and Active Galactic Nuclei. IV. Fine Scale Structure (2005)
Kovalev, Y. Y., Kellermann, K. I., Lister, M. L., Homan, D. C., Vermeulen, R. C., Cohen, M. H., ...
We have used VLBA fringe visibility data obtained at 15 GHz to examine the compact structure in 250 extragalactic radio sources. For 171 sources in our sample, more than half of the total flux...
High Resolution Studies of Radio Sources in the Hubble Deep and Flanking Fields (2005)
Muxlow, T. W. B., Richards, A. M. S., Garrington, S. T., Wilkinson, P. N., Anderson, B., Richards, E. A., ...
Eighteen days of MERLIN data and 42 hours of A-array VLA data at 1.4 GHz have been combined to image a 10-arcmin field centred on the Hubble Deep and Flanking Fields (HDF and HFF). A complete sample...
Sub-milliarcsecond imaging of quasars and active galactic nuclei. IV. Fine-scale structure (2005)
Kovalev, Y. Y., Kellermann, K. I., Lister, M. L., Homan, D. C., Vermeulen, R. C., Cohen, M. H., ...
We have examined the compact structure in 250 flat-spectrum extragalactic radio sources using interferometric fringe visibilities obtained with the Very Long Baseline Array (VLBA) at 15 GHz. With...
Sub-milliarcsecond imaging of quasars and active galactic nuclei. IV. Fine-scale structure (2005)
Kovalev, Y. Y., Kellermann, K. I., Lister, M. L., Homan, D. C., Vermeulen, R. C., Cohen, M. H., ...
We have examined the compact structure in 250 flat-spectrum extragalactic radio sources using interferometric fringe visibilities obtained with the Very Long Baseline Array (VLBA) at 15 GHz. With...
A CONTINUUM SURVEY FOR DISCRETE RADIO SOURCES AT 1421 MC/S, (2005)
Kellermann, K. I., Read, R. B.
Preliminary results of a continuum survey at 1412 Mc/s being carried out at the Owens Valley Radio Observatory are given for a 6-1/3 degree strip of declination. The coordinates and apparent flux...
Sub-milliarcsecond imaging of quasars and active galactic nuclei. IV. Fine-scale structure (2005)
Kovalev, Y. Y., Kellermann, K. I., Lister, M. L., Homan, D. C., Vermeulen, R. C., Cohen, M. H., ...
The Exploration of the Unknown (2004)
Wilkinson, P. N., Kellermann, K. I., Ekers, R. D., Cordes, J. M., Lazio, T. Joseph W.
The Square Kilometre Array is conceived as a telescope which will both test fundamental physical laws and transform our current picture of the Universe. However, the scientific challenges outlined in...
The Parkes quarter-Jansky flat-spectrum sample 3. Space density and evolution of QSOs (2004)
Wall, J. V., Jackson, C. A., Shaver, P. A., Hook, I. M., Kellermann, K. I.
We analyze the Parkes quarter-Jansky flat-spectrum sample of QSOs in terms of space density, including the redshift distribution, the radio luminosity function, and the evidence for a redshift...
Kellermann, K. I., Lister, M. L., Homan, D. C., Vermeulen, R. C., Cohen, M. H., Ros, E., ...
We report the results of a 15 GHz (2 cm) multi-epoch VLBA program, begun in 1994 to study the outflow in radio jets ejected from quasars and active galaxies. The observed flow of 208 distinct...
Ionised, Atomic, and Molecular Gas around the Twin Radio Jets of NGC1052 (2003)
Vermeulen, R. C., Ros, E., Zensus, J. A., Kellermann, K. I., Cohen, M. H., Van Langevelde, H. J.
The bright radio structure of the LINER elliptical galaxy NGC1052 is dominated by bi-symmetric jets on parsec scales. Features move outward on both sides of the core at v_{app}~0.26c. We have...
Variability and Velocity of Superluminal Sources (2003)
Cohen, M. H., Russo, M. A., Homan, D. C., Kellermann, K. I., Lister, M. L., Vermeulen, R. C., ...
We investigate the relation between the Doppler factor determined from variations in total flux at 22 and 37 GHz, and the apparent transverse velocity determined from VLBA observations at 2 cm. The...
We review the observations of rapid flux density variations in compact radio sources, and discuss the inverse Compton limit to the maximum brightness temperature of incoherent synchrotron sources in...
Jet Collimation in Action: Re-alignment on Kiloparsec Scales in 3C279 (2003)
Homan, D. C., Lister, M. L., Kellermann, K. I., Cohen, M. H., Ros, E., Zensus, J. A., ...
We report a change in the trajectory of a well studied jet component of the quasar 3C279. The component changes in apparent projected speed and direction, and we find it to be moving with a Lorentz...
Variability and velocity of superluminal sources (2003)
Cohen, M. H., Russo, M. A., Homan, D. C., Kellermann, K. I., Lister, M. L., Vermeulen, R. C., ...
Superluminal motion and relativistic beaming in blazar jets (2003)
Kellermann, K. I., Lister, M. L., Homan, D. C., Ros, E., Zensus, J. A., Cohen, M. H., ...
Kinematics of relativistic jets in active galactic nuclei : the 2 cm VLBA survey (2003)
Lister, M. L., Kellermann, K. I., Homan, D. C., Ros, E., Zensus, J. A., Kadler, M., ...
Ionised, atomic, and molecular gas around the twin radio jets of NGC 1052 (2003)
Vermeulen, R. C., Ros, E., Zensus, J. A., Kellermann, K. I., Cohen, M. H., Van Langevelde, H. J.
4C+12.50 : a superluminal precessing jet in the recent merger system IRAS 13451+1232 (2003)
Lister, M. L., Kellermann, K. I., Vermeulen, R. C., Cohen, M. H., Zensus, J. A., Ros, E.
We present the results of a multiepoch Very Long Baseline Array study of the powerful radio source 4C + 12.50 ( PKS 1345+ 125) at a wavelength of 2 cm. This compact radio source is associated with a...
Jet collimation in action : realignment on kiloparsec scales in 3C 279 (2003)
Homan, D. C., Lister, M. L., Kellermann, K. I., Cohen, M. H., Ros, E., Zensus, J. A., ...
We report a change in the trajectory of a well-studied jet component of the quasar 3C 279. The component changes in apparent projected speed and direction, and we find it to be moving with a Lorentz...
The shroud around the 'compact, symmetric' radio jets in NGC1052 (2003)
Vermeulen, R. C., Ros, E., Kellermann, K. I., Cohen, M. H., Zensus, J. A., Van Langevelde, H. J.
This is a paper on young jet material in a frustratingly complex environment.NGC 1052 has a compact, flat or GHz peaked spectrum radio nucleus consisting of bi-symmetric jets, oriented close to the...
The shroud around the twin radio jets in NGC 1052 (2003)
Vermeulen, R. C., Ros, E., Kellermann, K. I., Cohen, M. H., Zensus, J. A., Van Langevelde, H. J.
We discuss multiple Very Long Baseline Interferometry (VLBI) continuum and spectral line imaging observations and Westerbork Synthesis Radio Telescope spectroscopy of the compact variable nuclear...
Hook, I. M., Shaver, P. A., Jackson, C. A., Wall, J. V., Kellermann, K. I.
We present optical spectra and redshift measurements for 178 flat-spectrum objects from the Parkes quarter-Jansky flat-spectrum sample. These spectra were obtained in order to compile a complete...
The Shroud Around the Twin Radio Jets in NGC 1052 (2002)
Vermeulen, R. C., Ros, E., Kellermann, K. I., Cohen, M. H., Zensus, J. A., Van Langevelde, H. J.
(Abridged) We discuss multiple VLBI continuum and spectral line observations and WSRT spectroscopy of NGC 1052. Sub-parsec scale features move outward at approximately 0.26c in bi-symmetric jets,...
Superluminal Motion and Relativistic Beaming in Blazar Jets (2002)
Kellermann, K. I., Lister, M. L., Homan, D. C., Ros, E., Zensus, J. A., Cohen, M. H., ...
High resolution radio observations remain the most direct way to study the formation and evolution of radio jets associated with the accretion onto massive black holes. We report preliminary results...
4C +12.50: A Superluminal Precessing Jet in the Recent Merger System IRAS 13451+1232 (2002)
Lister, M. L., Kellermann, K. I., Vermeulen, R. C., Cohen, M. H., Zensus, J. A., Ros, E.
We present the results of a multi-epoch VLBA study of the powerful radio source 4C +12.50 (PKS 1345+125) at a wavelength of 2 cm. This compact radio source is associated with a hidden quasar whose...
The shroud around the "compact, symmetric" radio jets in NGC 1052 (2002)
Vermeulen, R. C., Ros, E., Kellermann, K. I., Cohen, M. H., Zensus, J. A., Van Langevelde, H. J.
This is a paper on young jet material in a frustratingly complex environment. NGC 1052 has a compact, flat- or GHz-peaked-spectrum radio nucleus consisting of bi-symmetric jets, oriented close to the...
The Central Parsecs of the Bright Quasar PKS 1921 - 293 (2002)
Moran, J. M., Kellermann, K. I.
We report on a VLBA imaging study of the nearby bright southern blazar PKS 1921 - 293 (OV - 236). High resolution VLBA observations, made at four frequencies (5, 12, 15, and 43 GHz) over the period...
The Diverse Properties of GPS Sources (2002)
Lister, M. L., Kellermann, K. I., Pauliny-Toth, I. I.
We discuss the morphology and kinematics of five gigahertz-peaked spectrum (GPS) sources that have been observed with the VLBA. We find a wide range of observed properties including core-jet...
Kinematics of parsec-scale structures in AGN: the 2cm VLBA Survey (2002)
Ros, E., Kellermann, K. I., Lister, M. L., Zensus, J. A., Cohen, M. H., Vermeulen, R. C., ...
We are investigating the kinematics of jets in active galactic nuclei on parsec scales by studying a representative population of sources. This study is being carried out using the Very Long Baseline...
Sub-Milliarcsecond Imaging of Quasars and Active Galactic Nuclei. II. Additional Sources (2002)
Zensus, J. A., Ros, E., Kellermann, K. I., Cohen, M. H., Vermeulen, R. C., Kadler, M.
We report further results from our imaging survey at 15GHz (lambda=2 cm) with the Very Long Baseline Array. This paper presents single epoch images for 39 sources, bringing the total number of...
The Micro-Jansky Sky at 8.4 GHz (2002)
Fomalont, E. B., Kellermann, K. I., Partridge, R. B., Windhorst, R. A., Richards, E. A.
We present the results from two radio integrations at 8.4 GHz using the VLA. One of the fields, at 13h,+43d (SA13 field), has an rms noise level of 1.49 microJy and is the deepest radio image yet...
Observations with a VLB Array. The Sources 3C120, 3C273, 2134+004, and 3C84. III. (2002)
Schilizzi,R. T., Cohen,M. H., Romney,J. D., Shaffer,D. B., Kellermann,K. I.
The sources 3C120, 3C273, 2134+004 and 3C84 were observed at several apochs at 2.8 cm using a multi-element very-long-baseline interferometer. The resulting visibility data show that the brightness...
Shaffer,D. B., Cohen,M. H., Romney,J. D., Schilizzi,R. T., Kellermann,K. I.
Three-antenna long baseline interferometry at 10.7 GHz is reported for NRAO150, 4C39.25, 3C345, VRO42.22.01, and 3C454.3 for several epochs between April, 1972 and February, 1974. Simple models for...
Sub-milliarcsecond imaging of quasars and active galactic nuclei. II. Additional sources (2002)
Zensus, J. A., Ros, E., Kellermann, K. I., Cohen, M. H., Vermeulen, R. C., Kadler, M.
We report further results from our imaging survey at 15 GHz (lambda = 2 cm) with the Very Long Baseline Array (VLBA). This paper presents single-epoch images for 39 sources, bringing the total number...
Kinematics of parsec-scale structures in AGN : the 2cm VLBA survey (2002)
Ros, E., Kellermann, K. I., Lister, M. L., Zensus, J. A., Cohen, M. H., Vermeulen, R. C., ...
R. C. Vermeulen, E. Ros, K. I. Kellermann, M. H. Cohen, J. A. Zensus
Abstract. We discuss multiple Very Long Baseline Interferometry (VLBI) continuum and spectral line imaging observations and Westerbork Synthesis Radio Telescope spectroscopy of the compact variable...
VLBA studies of the accretion region in NGC 1275 (2001)
Walker, R.C., Kellermann, K.I., Dhawan, V., Romney, J.D., Anantharamaiah, K.R., Vermeulen, R.C., ...
Restricted Access. Galaxies and their Constituents at the Highest Angular Resolutions, Proceedings of IAU Symposium #205, held 15-18 August 2000 at Manchester, United Kingdom. Ed. R. T. Schilizzi,...
VSOP observation of the quasar PKS 2215+020: a new laboratory for core-jet physics at z=3.572 (2000)
Lobanov, A. P., Gurvits, L. I., Frey, S., Schilizzi, R. T., Kellermann, K. I., Kawaguchi, N., ...
We report results of a VSOP (VLBI Space Observatory Programme) observation of a high redshift quasar PKS 2215+020 (z=3.572). The ~1 milliarcsecond resolution image of the quasar reveals a prominent...
VLBA Absorption Imaging of Ionized Gas Associated with the Accretion Disk in NGC 1275 (1999)
Walker, R. C., Dhawan, V., Romney, J. D., Kellermann, K. I., Vermeulen, R. C.
Nearly simultaneous VLBA observations of 3C 84, the radio source associated with NGC 1275, have been made at multiple frequencies to study the free-free absorption of the northern, or "counterjet",...
Optically Faint Microjansky Radio Sources (1999)
Richards, E. A., Fomalont, E. B., Kellermann, K. I., Windhorst, R. A., Partridge, R. B, Cowie, L. L., ...
We report on the identifications of radio sources from our survey of the Hubble Deep Field and the SSA13 fields, both of which comprise the deepest radio surveys to date at 1.4 GHz and 8.5 GHz...
Kellermann, K. I., Richards, E. A.
Deep radio surveys show a population of very red counterparts of microjansky radio sources, which are unidentified to I = 25 in ground based images and I = 28.5 in the Hubble Deep Field. This...
VLBI imaging of extremely high redshift quasars at 5 GHz (1999)
Paragi, Z., Frey, S., Gurvits, L. I., Kellermann, K. I., Schilizzi, R. T., McMahon, R. G., ...
We present very long baseline interferometry (VLBI) images of ten very high redshift (z>3) quasars at 5 GHz. The sources 0004+139, 0830+101, 0906+041, 0938+119 and 1500+045 were observed in September...
VLBI imaging of extremely high redshift quasars at 5 GHz (1999)
Paragi, Z., Frey, S., Gurvits, L.I., Kellermann, K.I., Schilizzi, R.T., McMahon, R.G., ...
VLBI imaging of extremely high redshift quasars at 5 GHz (1999)
Paragi, Z., Frey, S., Gurvits, L.I., Kellermann, K.I., Schilizzi, R.T., McMahon, R.G., ...
VLBI imaging of extremely high redshift quasars at 5 GHz (1999)
Z. Paragi, S. Frey, L. I. Gurvits, K. I. Kellermann, R. T. Schilizzi, R. G. Mcmahon, ...
. We present very long baseline interferometry (VLBI) images of ten very high redshift (z ? 3) quasars at 5 GHz. The sources 0004+139, 0830+101, 0906+041, 0938+119 and 1500+045 were observed in...
Gurvits, L. I., Kellermann, K. I., Frey, S.
We discuss the ``angular size - redshift'' relation for compact radio sources distributed over a wide range of redshifts 0.01 < z < 4.73. Our study is based on a sample of 330 5 GHz VLBI contour maps...
COMPACT RADIO SOURCE IN THE NUCLEUS OF M 87, (1998)
Cohen,M. H., Moffet,A. T., Shaffer,D., Clark,B. G., Kellermann,K. I.
The compact radio source in M 87 has been observed with a long baseline interferometer composed of the 210-foot telescope at Goldstone, California, U.S.A., and the 85-foot telescope at Tidbinbilla,...
High Resolution Observations of Compact Radio Sources at 6 and 18 CM, (1998)
Kellermann,K. I., Jauncey,D. L., Cohen,M. H., Shaffer,D. B., Clark,B. G.
The small scale structure of extragalactic radio sources has been studied at 18 and 6 cm wavelengths using a tape recording interferometer. At the longest antenna spacing, 10,536 km, the baselines at...
Radio Emission from Galaxies In The Hubble Deep Field (1998)
Richards, E. A., Kellermann, K. I., Fomalont, E. B., Windhorst, R. A., Partridge, R. B.
We report on sensitive radio observations made with the VLA at 8.5 GHz, centered on the Hubble Deep Field (HDF). We collected data in the A, CnB, C, DnC, and D configurations, corresponding to...
The Redshift Cutoff and the Quasar Epoch (1998)
Shaver, P. A., Hook, I. M., Jackson, C. A., Wall, J. V., Kellermann, K. I.
We have obtained complete redshift information for a sample of 442 radio-loud quasars with flux densities S(11cm) >= 0.25Jy. These come from a completely-identified sample of 878 flat-spectrum radio...
Sub-milliarcsecond Imaging of Quasars and AGN (1998)
Kellermann, K. I., Vermeulen, R. C., Zensus, J. A., Cohen, M. H.
We have used the VLBA at 15 GHz to image the structure of 132 strong compact AGN and quasars with a resolution better than one milliarcsecond and a dynamic range typically exceeding 1000 to 1. These...
S. Frey, L.I. Gurvits, K. I. Kellermann, R. T. Schilizzi
. We present results of first epoch high resolution imaging observations of four extremely distant quasars. The sample includes the only two radio-loud quasars at redshift z ? 4 known to the date of...
Detection of a Small Scale Cosmic Background Anisotropy at 3.6 cm (1996)
Richards, E. A., Fomalont, E. B., Kellermann, K. I., Partridge, R. B., Windhorst, R. A.
We report on the detection of a feature with negative radio flux in a sensitive, low resolution observation with the VLA. This morphologically peculiar feature is approximately 25" 65" in size with a...
New observations and gravitational lens models of the Cloverleaf quasar H1413 + 117 (1990)
Kayser, R, Surdej, Jean, Condon, J J, Kellermann, K I, Magain, Pierre, Remy, M, ...
New optical and radio observations of the quadruple quasar H1413 + 117, the Cloverleaf, are presented. VLA data show radio counterparts at the positions of the four optical images and an additional...
Observations of the new gravitational lens system UM 673 = Q 0142-100 (1988)
Surdej, Jean, Magain, Pierre, Swings, J-P, Borgeest, U, Courvoisier, T J-L, Kayer, R, ...
The authors have recently initiated a high resolution direct imaging survey of a selected sample of highly luminous quasars (HLQs). The observations are carried out with the 2.2 m telescope at ESO,...
Search for Gravitational Lensing from a Survey of Highly Luminous Quasars (1988)
Surdej, Jean, Swings, J-P, Magain, Pierre, Borgeest, U, Kayser, R, Refsdal, S, ...
Optical Surveys for Quasars, ASP Conference Series
Structure and evolution of the compact radio source in NGC 1275.
Romney, J D, Benson, J M, Dhawan, V, Kellermann, K I, Vermeulen, R C, Walker, R C
Investigations of the fine-scale structure in the compact nucleus of the radio source 3C 84 in NGC 1275 (New General Catalogue number) are reported. Structural monitoring observations beginning as...
Structure and evolution of the compact radio source in NGC 1275.
Romney, J D, Benson, J M, Dhawan, V, Kellermann, K I, Vermeulen, R C, Walker, R C
Investigations of the fine-scale structure in the compact nucleus of the radio source 3C 84 in NGC 1275 (New General Catalogue number) are reported. Structural monitoring observations beginning as...