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Performance of a Low Noise Front-end ASIC for Si/CdTe Detectors in Compton Gamma-ray Telescope
H. Tajima, T. Nakamoto, T. Tanaka +11
Compton telescopes based on semiconductor technologies are being developed to explore the gamma-ray universe in an energy band 0.1--20 MeV, which is not well covered by the present…
Constraints on Cosmological Parameters from the Analysis of the Cosmic Lens All Sky Survey Radio-Selected Gravitational Lens Statistics
K. -H. Chae, A. D. Biggs, R. D. Blandford +20
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)…
High resolution observations and mass modelling of the CLASS gravitational lens B1152+199
D. Rusin, M. Norbury, A. D. Biggs +5
We present a series of high resolution radio and optical observations of the CLASS gravitational lens system B1152+199 obtained with the Multi-Element Radio-Linked Interferometer N…
The new two-image gravitational lens system CLASS B2319+051
D. Rusin, D. R. Marlow, M. Norbury +10
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-E…
A New Quadruple Gravitational Lens System: CLASS B0128+437
P. M. Phillips, M. A. Norbury, L. V. E. Koopmans +15
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 en…
CLASS B0739+366: A new two-image gravitational lens system
D. R. Marlow, D. Rusin, M. Norbury +10
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…
Redshifts of CLASS Radio Sources
D. R. Marlow, D. Rusin, N. Jackson +3
Spectroscopic observations of a sample of 42 flat-spectrum radio sources from the Cosmic Lens All-Sky Survey (CLASS) have yielded a mean redshift of with an RMS spread…
CFHT AO Imaging of the CLASS Gravitational Lens System B1359+154
D. Rusin, P. B. Hall, R. C. Nichol +3
We present adaptive optics imaging of the CLASS gravitational lens system B1359+154 obtained with the Canada-France-Hawaii Telescope (CFHT) in the infrared K band. The observations…
CLASS B1152+199 and B1359+154: Two New Gravitational Lens Systems Discovered in the Cosmic Lens All-Sky Survey
S. T. Myers, D. Rusin, C. D. Fassnacht +9
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 surv…
Gravitational lensing statistics with extragalactic surveys. II. Analysis of the Jodrell Bank-VLA Astrometric Survey
P. Helbig, D. R. Marlow, R. Quast +3
We present constraints on the cosmological constant from gravitational lensing statistics of the Jodrell Bank-VLA Astrometric Survey (JVAS). Although this is the largest gr…
Measuring Cosmological Parameters with the JVAS and CLASS Gravitational Lens Surveys
P. Helbig, R. D. Blandford, I. W. A. Browne +11
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 r…
A new radio double lens from CLASS: B1127+385
L. V. E. Koopmans, A. G. de Bruyn, D. R. Marlow +9
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 Sk…
B2045+265: A New Four-Image Gravitational Lens from CLASS
C. D. Fassnacht, R. D. Blandford, J. G. Cohen +14
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 compo…
NICMOS and VLBA observations of the gravitational lens system B1933+503
D. R. Marlow, I. W. A. Browne, N. Jackson +1
NICMOS observations of the complex gravitational lens system B1933+503 reveal infrared counterparts to two of the inverted spectrum radio images. The infrared images have arc-like…
The new gravitational lens system B1030+074
E. Xanthopoulos, I. W. A. Browne, L. J. King +6
We report the discovery of a new double image gravitational lens system B1030+074 which was found during the Jodrell Bank - VLA Astrometric Survey (JVAS). We have collected extensi…
The complex gravitational lens system B1933+503
C. M. Sykes, I. W. A. Browne, N. J. Jackson +15
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 rad…
A complete infrared Einstein ring in the gravitational lens system B1938+666
L. J. King, N. J. Jackson, R. D. Blandford +8
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 d…