Suyu, S. H., Marshall, P. J., Auger, M. W., Hilbert, S., Blandford, R. D., Koopmans, L. V. E., ...
Strong gravitational lens systems with measured time delays between the multiple images provide a method for measuring the ``time-delay distance'' to the lens, and thus the Hubble constant. We...
Fermi Discovery of Gamma-Ray Emission from Ngc 1275 (2009)
Abdo, A. A., Ackermann, M., Ajello, M., Asano, K., Baldini, L., Ballet, J., ...
Dissecting the Gravitational Lens B1608+656. I. Lens Potential Reconstruction (2009)
Suyu, S. H., Marshall, P. J., Blandford, R. D., Fassnacht, C. D., Koopmans, L. V. E., McKean, J. P., ...
Strong gravitational lensing is a powerful technique for probing galaxy mass distributions and for measuring cosmological parameters. Lens systems with extended source-intensity distributions are...
Fermi observations of high-energy gamma-ray emission from GRB 080916C (2009)
Abdo, A. A., Ackermann, M., Arimoto, M., Asano, K., Atwood, W. B., Axelsson, M., ...
Fermi large area telescope observations of the Vela pulsar (2009)
Abdo, A. A., Ackermann, M., Atwood, W. B., Axelsson, M., Baldini, L., Ballet, J., ...
The large area telescope on the Fermi gamma-ray space telescope mission (2009)
Atwood, W. B., Abdo, A. A., Ackermann, M., Althouse, W., Anderson, B., Axelsson, M., ...
Early Fermi gamma-ray space telescope observations of the quasar 3C 454.3 (2009)
Abdo, A. A., Ackermann, M., Ajello, M., Atwood, W. B., Axelsson, M., Baldini, L., ...
Fermi discovery of gamma-ray emission from NGC 1275 (2009)
Abdo, A. A., Ackermann, M., Ajello, M., Asano, K., Baldini, L., Ballet, J., ...
Fermi/large area telescope bright gamma-ray source list (2009)
Abdo, A. A., Ackermann, M., Ajello, M., Atwood, W. B., Axelsson, M., Baldini, L., ...
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., ...
Detection of high-energy gamma-ray emission from the globular cluster 47 Tucanae with Fermi (2009)
Abdo, A. A., Ackermann, M., Ajello, M., Atwood, W. B., Axelsson, M., Baldini, L., ...
Detection of 16 gamma-ray pulsars through blind frequency searches using the Fermi LAT (2009)
Abdo, A. A., Ackermann, M., Ajello, M., Anderson, B., Atwood, W. B., Axelsson, M., ...
Dissecting the Gravitational Lens B1608+656. I. Lens Potential Reconstruction (2008)
Suyu, S. H., Marshall, P. J., Blandford, R. D., Fassnacht, C. D., Koopmans, L. V. E., McKean, J. P., ...
Strong gravitational lensing is a powerful technique for probing galaxy mass distributions and for measuring cosmological parameters. We present a pixelated approach to modeling simultaneously the...
Characteristics of EGRET Blazars in the VLBA Imaging and Polarimetry Survey (VIPS) (2007)
Taylor, G. B., Healey, S. E., Helmboldt, J. F., Tremblay, S., Fassnacht, C. D., Walker, R. C., ...
We examine the radio properties of EGRET-detected blazars observed as part of the VLBA Imaging and Polarimetry Survey (VIPS). VIPS has a flux limit roughly an order of magnitude below the MOJAVE...
The Sloan Digital Sky Survey-II Supernova Survey: Technical Summary (2007)
Frieman, Joshua A., Bassett, B., Becker, A., Choi, C., Cinabro, D., DeJongh, F., ...
The Sloan Digital Sky Survey-II (SDSS-II) has embarked on a multi-year project to identify and measure light curves for intermediate-redshift (0.05 < z < 0.35) Type Ia supernovae (SNe Ia) using...
McKean, J. P., Koopmans, L. V. E., Flack, C. E., Fassnacht, C. D., Thompson, D., Matthews, K., ...
The existence of flux-ratio anomalies between fold and cusp images in galaxy-scale strong-lens systems has led to an interpretation based on the presence of a high mass-fraction of cold-dark-matter...
Fassnacht, C. D., McKean, J. P., Koopmans, L. V. E., Treu, T., Blandford, R. D., Auger, M. W., ...
We report the serendipitous discovery of two strong gravitational lens candidates (ACS J160919+6532 and ACS J160910+6532) in deep images obtained with the Advanced Camera for Surveys on the Hubble...
A Bayesian analysis of regularised source inversions in gravitational lensing (2006)
Suyu, S. H., Marshall, P. J., Hobson, M. P., Blandford, R. D.
Strong gravitational lens systems with extended sources are of special interest because they provide additional constraints on the models of the lens systems. To use a gravitational lens system for...
The anatomy of a quadruply imaged gravitational lens system (2005)
The key to using a strong gravitational lens system to measure the Hubble constant is to obtain an accurate model of the lens potential. In this paper, we investigate the properties of gravitational...
CLASS B0631+519: Last of the CLASS lenses (2005)
York, T., Jackson, N., Browne, I. W. A., Koopmans, L. V. E., McKean, J. P., Norbury, M. A., ...
We report the discovery of a new gravitational lens system from the CLASS survey, CLASS B0631+519. VLA, MERLIN and VLBA observations show a doubly-imaged radio core, a doubly-imaged lobe and a second...
CLASS B2108+213: A new wide separation gravitational lens system (2004)
McKean, J. P., Browne, I. W. A., Jackson, N. J., Koopmans, L. V. E., Norbury, M. A., Treu, T., ...
We present observations of CLASS B2108+213, the widest separation gravitational lens system discovered by the Cosmic Lens All-Sky Survey. Radio imaging using the VLA at 8.46 GHz and MERLIN at 5 GHz...
Blandford, R. D., Amin, M., Baltz, E. A., Mandel, K., Marshall, P. J.
Our fundamental lack of understanding of the acceleration of the Universe suggests that we consider a kinematic description. The simplest formalism involves the third derivative of the scale factor...
Keck spectroscopy of CLASS gravitational lenses (2004)
McKean, J. P, Koopmans, L. V. E., Browne, I. W. A., Fassnacht, C. D., Blandford, R. D., Lubin, L. M., ...
We present the optical spectra of four newly discovered gravitational lenses from the Cosmic Lens All-Sky Survey (CLASS). These observations were carried out using the Low Resolution Imaging...
The Hubble Constant from the Gravitational Lens B1608+656 (2003)
Koopmans, L. V. E., Treu, T., Fassnacht, C. D., Blandford, R. D., Surpi, G.
We present a refined gravitational lens model of the four-image lens system B1608+656 based on new and improved observational constraints: (i) the three independent time-delays and flux-ratios from...
X-ray astronomy in the new millenium: a summary (2003)
Recent X-ray observations have had a major impact on topics ranging from protostars to cosmology. They have also drawn attention to important and general physical processes that currently limit our...
Extrinsic Radio Variability of JVAS/CLASS Gravitational Lenses (2003)
Koopmans, L. V. E., Biggs, A., Blandford, R. D., Browne, I. W. A., Jackson, N. J., Mao, S., ...
We present flux-ratio curves of the fold and cusp (i.e. close multiple) images of six JVAS/CLASS gravitational lens systems. The data were obtained over a period of 8.5 months in 2001 with the...
The Phenomena of High Energy Astrophysics (2003)
A brief summary of some highlights in the study of high energy astrophysical sources over the past decade is presented. It is argued that the great progress that has been made derives largely from...
The Cosmic Lens All-Sky Survey:II. Gravitational lens candidate selection and follow-up (2002)
Browne, I. W. A., Wilkinson, P. N., Jackson, N. J. F., Myers, S. T., Fassnacht, C. D., Koopmans, L. V. E., ...
We report the final results of the search for gravitationally lensed flat-spectrum radio sources found in the combination of CLASS (Cosmic Lens All Sky Survey) and JVAS (Jodrell-Bank VLA Astrometric...
The Cosmic Lens All-Sky Survey: I. Source selection and observations (2002)
Myers, S. T., Jackson, N. J., Browne, I. W. A., De Bruyn, A. G., Pearson, T. J., Readhead, A. C. S., ...
The Cosmic Lens All-Sky Survey (CLASS) is an international collaborative program which has obtained high-resolution radio images of over 10000 flat-spectrum radio sources in order to create the...
B0850+054: a new gravitational lens system from CLASS (2002)
Biggs, A. D., Rusin, D., Browne, I. W. A., De Bruyn, A. G., Jackson, N. J., Koopmans, L. V. E., ...
We report the discovery of a new gravitational lens system from the CLASS survey. Radio observations with the VLA, the WSRT and MERLIN show that the radio source B0850+054 is comprised of two compact...
CLASS B0445+123 : a new two-image gravitational lens system (2002)
Norbury, M. A., Myers, S. T., Marlow, D. R., Koopmans, L. V. E., Fassnacht, C. D., Chae, K. H., ...
Submitted to: Mon. Not. R. Astron. Soc. Abstract: A new two-image gravitational lens system has been discovered as a result of the Cosmic Lens All-Sky Survey (CLASS). Radio observations with the VLA,...
CLASS B0445+123: a new two-image gravitational lens system (2002)
Argo, M. K., Jackson, N. J., Browne, I. W. A., York, T., McKean, J. P., Biggs, A. D., ...
A new two-image gravitational lens system has been discovered as a result of the Cosmic Lens All-Sky Survey (CLASS). Radio observations with the VLA, MERLIN and the VLBA at increasingly higher...
Biggs, A. D., Blandford, R. D., Browne, I. W. A., De Bruyn, A. G., Fassnacht, C. D., ...
We derive constraints on cosmological parameters and the properties of the lensing galaxies from gravitational lens statistics based on the final Cosmic Lens All Sky Survey (CLASS) data. For a flat...
New Problems for a New Century (2002)
A summary is presented of a symposium held to review recent progress in X-ray astronomy and to discuss prospects for the next generation of X-ray missions. The summary is organized around ten...
Current High Energy Emission from Black Holes (2002)
Two related topics are discussed. 1. Accretion onto black holes at low and high (though not very high) rates is believed to proceed adiabatically ({\em ie} non-radiatively). It is argued that the...
The extreme hypothesis that essentially all types of ultrarelativistic outflow -- specifically AGN jets, pulsar wind nebulae and GRB --are electromagnetic, rather than gas dynamical, phenomena is...
2016+112 : a gravitationally lensed type II quasar (2002)
Koopmans, L. V. E., Garrett, M. A., Blandford, R. D., Lawrence, C. R., Patnaik, A. R., Porcas, R. W.
A single-screen model of the gravitational lens system 2016+112 is proposed, that explains recent Hubble Space Telescope (HST ) infrared (NICMOS-F160W) observations and new high-resolution European...
The Gravitational Lens B1608+656: I. V, I, and H-band HST Imaging (2001)
We present a multi-wavelength analysis of high-resolution observations of the quadruple lens B1608+656 from the HST archive, acquired with WFPC2 through filters F606W (V-band) and F814W (I-band), and...
The Future of Gravitational Optics (2001)
In this speculative, millenial essay, I try to anticipate what sort of novel gravitational optics investigations might be observed, after it becomes possible to map and monitor roughly a trillion...
There are now several types of relativistic flows in astrophysical settings. The foremost examples are jets and disks orbiting spinning black holes, pulsar winds and gamma ray bursts. As discussed at...
Black Holes and Relativistic Jets (2001)
There is strong observational evidence that AGN, Galactic X-ray transients and (probably) $\gamma$-ray bursts are associated with black holes, and that these sources are able to form collimated,...
Particles and Fields in Radio Galaxies: A Summary (2001)
A summary is presented of a meeting on Particles and Fields in Radio Galaxies held in Oxford in August 2000. Recent detailed studies of radio maps and the first X-ray images from Chandra X-ray...
Energy Release and Transport Processes in the Centers of Galaxies (2001)
Observations over the past decade have verified, beyond reasonable doubt, that most galactic nuclei contain massive black holes. Hole masses are being measured and firm evidence for spin is being...
Probing the Physics of AGN: A Summary (2001)
A summary critique is presented of the topics discussed at a workshop entitled ``Probing the Physics of Active Galactic Nuclei by Multi-wavelength Monitoring'' held at Goddard Space Flight Center...
The Kinematics of High Proper Motion Halo White Dwarfs (2001)
Koopmans, L. V. E., Blandford, R. D.
We analyse the kinematics of the entire spectroscopic sample of 99 recently discovered high proper-motion white dwarfs by Oppenheimer et al. using a maximum-likelihood analysis, and discuss the claim...
2016+112: A Gravitationally Lensed Type-II Quasar (2001)
Koopmans, L. V. E., Garrett, M. A., Blandford, R. D., Lawrence, C. R., Patnaik, A. R., Porcas, R. W.
A single-screen model of the gravitational lens system 2016+112 is proposed, that explains recent Hubble Space Telescope} (HST) infrared (NICMOS-F160W) observations and new high-resolution European...
White Dwarfs: Contributors and Tracers of the Galactic Dark-Matter Halo (2001)
Koopmans, L. V. E., Blandford, R. D.
We examine the claim by Oppenheimer et al. (2001) that the local halo density of white dwarfs is an order of magnitude higher than previously thought. As it stands, the observational data support the...
The new two-image gravitational lens system CLASS B2319+051 (2001)
Rusin, D., Marlow, D. R., Norbury, M., Browne, I. W. A., Jackson, N., Wilkinson, P. N., ...
We report the discovery of a new two-image gravitational lens system from the Cosmic Lens All-Sky Survey, CLASS B2319+051. Radio imaging with the Very Large Array (VLA) and Multi-Element Radio-Linked...
Radio Microlensing: Past, Present & Near Future (2000)
Koopmans, L. V. E., De Bruyn, A. G., Fassnacht, C. D., Wambsganss, J., Blandford, R. D., Collaboration, + CLASS
Strongly correlated non-intrinsic variability between 5 and 8.5 GHz has been observed in one of the lensed images of the gravitational lens B1600+434. These non-intrinsic (i.e. `external') variations...
A New Quadruple Gravitational Lens System: CLASS B0128+437 (2000)
Phillips, P. M., Norbury, M. A., Koopmans, L. V. E., Browne, I. W. A., Jackson, N. J., Wilkinson, P. N., ...
High resolution MERLIN observations of a newly-discovered four-image gravitational lens system, B0128+437, are presented. The system was found after a careful re-analysis of the entire CLASS dataset....
High Spatial Resolution Imaging of NGC 1068 in the Mid Infrared (2000)
Bock, J. J., Neugebauer, G., Matthews, K., Soifer, B. T., Marsh, K., ...
Mid-infrared observations of the central source of NGC 1068 have been obtained with a spatial resolution in the deconvolved image of 0.1" (~ 7pc). The central source is extended by ~1" in the...
CLASS B0739+366: A new two-image gravitational lens system (2000)
Marlow, D. R., Rusin, D., Norbury, M., Jackson, N., Browne, I. W. A., Wilkinson, P. N., ...
We present the discovery of CLASS B0739+366, a new gravitational lens system from the Cosmic Lens All-Sky Survey. Radio imaging of the source with the Very Large Array (VLA) shows two compact...
CLASS B0827+525: `Dark lens' or binary radio-loud quasar? (2000)
Koopmans, L. V. E., De Bruyn, A. G., Fassnacht, C. D., Marlow, D. R., Rusin, D., Blandford, R. D., ...
We present radio, optical, near-infrared and spectroscopic observations of the source B0827+525. We consider this source as the best candidate from the Cosmic Lens All-Sky Survey (CLASS) for a `dark...
Cosmic explosions are observed in many astrophysical environments. They range in scale from hydromagnetic instabilities in the terrestrial magnetotail and solar ``nanoflares'' to cosmological gamma...
Quasar Jets and their Fields (2000)
Observations of jets from quasars and other types of accreting black hole are briefly summarized. The importance of beaming and $\gamma$-ray observations for understanding the origin of these jets is...
Lubin, L. M., Fassnacht, C. D., Readhead, A. C. S., Blandford, R. D., Kundic, T.
We present new results from a continuing Keck program to study gravitational lens systems. We have obtained redshifts for three lens systems, SBS 0909+532, HST 1411+5211, and CLASS B2319+051. For all...
Origin and Evolution of Massive Black Holes in Galactic Nuclei (1999)
Beyond all reasonable doubt, black holes are commonly found in the nuclei of most normal galaxies. In recent years, dynamical measurements of hole masses have transformed the study of their...
Acceleration of Ultra High Energy Cosmic Rays (1999)
Some general features of cosmic ray acceleration are summarized along with some inferences that can be drawn concerning the origin of the UHE component. The UHE luminosity density is found to be...
Myers, S. T., Rusin, D., Fassnacht, C. D., Blandford, R. D., Pearson, T. J., Readhead, A. C. S., ...
The third phase of the Cosmic Lens All-Sky Survey (CLASS) has recently been completed, bringing the total number of sources imaged to over 15000 in the CLASS and JVAS combined survey. In the VLA...
Measuring Cosmological Parameters with the JVAS and CLASS Gravitational Lens Surveys (1999)
Helbig, P., Blandford, R. D., Browne, I. W. A., De Bruyn, A. G., Fassnacht, C. D., Jackson, N., ...
The JVAS (Jodrell Bank-VLA Astrometric Survey) and CLASS (Cosmic Lens All-Sky Survey) are well-defined surveys containing about ten thousand flat-spectrum radio sources. For many reasons,...
Magneto-Centrifugal Launching of Jets from Accretion Disks. I: Cold Axisymmetric Flows (1999)
Krasnopolsky, R., Blandford, R. D.
The magneto-centrifugal model for jet formation is studied by time-dependent simulations reaching steady state in a cold gas with negligible fluid pressure, in an axisymmetric geometry, using a...
A new radio double lens from CLASS: B1127+385 (1998)
Koopmans, L. V. E., De Bruyn, A. G., Marlow, D. R., Jackson, N., Blandford, R. D., Browne, I. W. A., ...
We present the discovery of a new gravitational lens system with two compact radio images separated by 0.701+-0.001 arcsec. The lens system was discovered in the Cosmic Lens All Sky Survey (CLASS) as...
B2045+265: A New Four-Image Gravitational Lens from CLASS (1998)
Fassnacht, C. D., Blandford, R. D., Cohen, J. G., Matthews, K., Pearson, T. J., Readhead, A. C. S., ...
We have discovered a new gravitational lens in the Cosmic Lens All-Sky Survey (CLASS). B2045+265 is a four-image system with a maximum separation of 1.9 arcsec. A fifth radio component is detected,...
The complex gravitational lens system B1933+503 (1997)
Sykes, C. M., Browne, I. W. A., Jackson, N. J., Marlow, D. R., Nair, S., Wilkinson, P. N., ...
We report the discovery of the most complex arcsec-scale radio gravitational lens system yet known. B1933+503 was found during the course of the CLASS survey and MERLIN and VLA radio maps reveal up...
A complete infrared Einstein ring in the gravitational lens system B1938+666 (1997)
King, L. J., Jackson, N. J., Blandford, R. D., Bremer, M. N., Browne, I. W. A., De Bruyn, A. G., ...
We report the discovery, using NICMOS on the Hubble Space Telescope, of an arcsecond-diameter Einstein ring in the gravitational lens system B1938+666. The lensing galaxy is also detected, and is...
Yun, M. S., Scoville, N. Z., Carrasco, J. J., Blandford, R. D.
Gravitational lenses have long been advertised as primitive telescopes, capable of magnifying cosmologically distant sources (Zwicky 1937). In this Letter, we present new 0''.9 resolution CO (7-6)...
Bottorff, M., Korista, K. T., Shlosman, I., Blandford, R. D.
We analyze the results of long-term observations of broad-line region (BLR) in the Sy1 galaxy NGC 5548 and provide a critical comparison with the predictions of a hydromagnetically-driven outflow...
1600+434: a new gravitational lens system (1995)
Jackson, N., Bruyn, A.G. De, Myers, S., Bremer, M.N., Miley, G.K., Schilizzi, R.T., ...
1600+434: a new gravitational lens system (1995)
Jackson, N., Bruyn, A.G. De, Myers, S., Bremer, M.N., Miley, G.K., Schilizzi, R.T., ...
Hogg, David W., Blandford, R. D.
A gravitational lens model of the radio quasar B1422+231 is presented which can account for the image arrangement and approximately for the relative magnifications. The locations of the principal...