Britzen, S., Brinkmann, W., Campbell, R. M., Gliozzi, M., Readhead, A. C. S., Browne, I. W. A., ...
Context: We present the soft X-ray properties obtained in the ROSAT All-Sky survey and from pointed PSPC observations for the AGN in the complete flux-density limited Caltech-Jodrell Bank flat...
Britzen, S., Vermeulen, R. C., Taylor, G. B., Campbell, R. M., Pearson, T. J., Readhead, A. C. S., ...
Context: This is the first of a series of papers presenting VLBI observations of the 293 Caltech-Jodrell Bank Flat-Spectrum (hereafter CJF) sources and their analysis. Aims: One of the major goals of...
30 GHz flux density measurements of the Caltech-Jodrell flat-spectrum sources with OCRA-p (2007)
Lowe, S. R., Gawroński, M. P., Wilkinson, P. N., Kus, A. J., Browne, I. W. A., Pazderski, E., ...
To measure the 30-GHz flux densities of the 293 sources in the Caltech-Jodrell Bank flat-spectrum (CJF) sample. The measurements are part of an ongoing programme to measure the spectral energy...
J0316+4328: a Probable "Asymmetric Double" Lens (2007)
Boyce, E. R., Myers, S. T., Browne, I. W. A., Stroman, W. J., Jackson, N. J.
We report a probable gravitational lens J0316+4328, one of 19 candidate asymmetric double lenses (2 images at a high flux density ratio) from CLASS. Observations with the Very Large Array (VLA),...
Joshi, S. A., Battye, R. A., Browne, I. W. A., Jackson, N., Muxlow, T. W. B., Wilkinson, P. N.
We have used the very large JVAS/CLASS 8.4-GHz surveys of flat-spectrum radio sources to test the hypothesis that there is a systematic alignment of polarization position angle vectors on...
Jackson, N., Battye, R. A., Browne, I. W. A., Joshi, S., Muxlow, T. W. B., Wilkinson, P. N.
We have used the very large JVAS/CLASS 8.4-GHz surveys of flat-spectrum radio sources to obtain a large, uniformly observed and calibrated, sample of radio source polarizations. These are useful for...
A search for the third lensed image in JVAS B1030+074 (2007)
Zhang, M., Jackson, N., Porcas, R. W., Browne, I. W. A.
Central gravitational image detection is very important for the study of the mass distribution of the inner parts ($\sim 100$ pc) of lens galaxies. However, the detection of such images is extremely...
The Cosmic Lens All-Sky Survey parent population - I. Sample selection and number counts (2007)
McKean, J. P., Browne, I. W. A., Jackson, N. J., Fassnacht, C. D., Helbig, P.
We present the selection of the Jodrell Bank Flat-spectrum (JBF) radio source sample, which is designed to reduce the uncertainties in the Cosmic Lens All-Sky Survey (CLASS) gravitational lensing...
Improving efficiency in radio surveys for gravitational lenses (2006)
Many lens surveys have hitherto used observations of large samples of background sources to select the small minority which are multiply imaged by lensing galaxies along the line of sight. Recently...
Unification in the low radio luminosity regime; evidence from optical line emission (2005)
Marchã, M. J. M., Browne, I. W. A., Jethava, N., Antón, S.
We address the question of whether or not the properties of all low-luminosity flat spectrum radio sources, not just the obvious BL Lac objects, are consistent with them being the relativistically...
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...
The recognition of blazars and the blazar spectral sequence (2004)
We analyse a group of radio sources, a subset of the 200 mJy sample, all of which have core-jet radio structures measured with VLBI and have flat spectra stretching from the radio to the...
Strong Gravitational Lensing with SKA (2004)
Koopmans, L. V. E., Browne, I. W. A., Jackson, N. J.
The advent of new observational facilities in the last two decades has allowed the rapid discovery and high-resolution optical imaging of many strong lens systems from galaxy to cluster scales, as...
York, T., Jackson, N., Browne, I. W. A., Wucknitz, O., Skelton, J. E.
We present deep optical observations of the gravitational lens system CLASS B0218+357, from which we derive an estimate of the Hubble constant. Extensive radio observations have reduced the...
The SEDs of the revised 200 mJy sample (2004)
Anton, S., Browne, I. W. A., Marcha, M. J. M., Bondi, M., Polatidis, A.
We address the question of why low-luminosity radio sources with similar flat radio spectra show a range of optical activity. The investigation is based on the spectral energy distributions (SEDs) of...
Radio, optical and infrared observations of CLASS B0128+437 (2004)
Biggs, A. D., Browne, I. W. A., Jackson, N. J., York, T., Norbury, M. A., McKean, J. P., ...
We present new observations of the gravitational lens system CLASS B0128+437. HST observations detect a very faint, extended object in I-band with no emission from the lensed images visible; no...
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 spectral energy distributions of the revised 200-mJy sample (2004)
Antón, S., Browne, I. W. A., Marcha, M. J. M., Bondi, M., Polatidis, A.
Models for the lens and source of B0218+357 - A LensClean approach to determine H0 (2003)
Wucknitz, O., Biggs, A. D., Browne, I. W. A.
B0218+357 is one of the most promising systems to determine the Hubble constant from gravitational lenses. Consisting of two bright resolved images plus an Einstein ring, it provides better...
Motion Statistics in the CJ Survey -- The Status in October 2002 (2003)
Vermeulen, R. C., Britzen, S., Taylor, G. B., Pearson, T. J., Readhead, A. C. S., Wilkinson, P. N., ...
In the Caltech-Jodrell Survey of bright flat-spectrum radio sources, 3-5 epochs have now been observed for nearly all 293 sources; a uniquely large sample. The derivation of component motions has not...
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...
Global 8.4-GHz VLBI observations of JVAS B0218+357 (2003)
Biggs, A. D., Wucknitz, O., Porcas, R. W., Browne, I. W. A., Jackson, N. J., Mao, S., ...
In this paper we present new observations of the gravitational lens system JVAS B0218+357 made with a global very long baseline interferometry (VLBI) network at a frequency of 8.4 GHz. Our maps have...
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...
Global 8.4-GHz VLBI observations of JVAS B0218+357 (2002)
Biggs, A. D., Wucknitz, O., Porcas, R. W., Browne, I. W. A., Jackson, N. J., Mao, S., ...
In this paper we present new observations of the gravitational lens system JVAS B0218+357 made with a global VLBI network at a frequency of 8.4 GHz. Our maps have an rms noise of 30 microJy/beam and...
The orientation of the Seyfert nucleus in Markarian 348 (2002)
Anton, S., Thean, A., Pedlar, A., Browne, I. W. A.
Multi-frequency observations of Mrk 348 are presented consisting of 2 epochs of MERLIN data at 5 GHz, ISOPHOT data at 170, 90, 60 and 25 micron, NOT images at U, B, R and I bands and data at 1350...
EVN/Global observations of the gravitational lens JVAS B0218+357 at 8.4 GHz (2002)
Biggs, A. D., Wucknitz, O., Porcas, R. W., Browne, I. W. A., Jackson, N. L., Mao, S., ...
High resolution observations and mass modelling of the CLASS gravitational lens B1152+199 (2001)
Rusin, D., Norbury, M., Biggs, A. D., Marlow, D. R., Jackson, N. J., Browne, I. W. A., ...
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 Network (MERLIN),...
The CLASS blazar survey. I - selection criteria and radio properties (2001)
Marcha, M. J. M., Caccianiga, A., Browne, I. W. A., Jackson, N.
This paper presents a new complete and well defined sample of Flat Spectrum Radio Sources (FSRS) selected from the CLASS survey with the further constraint of a bright (mag
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...
Wilkinson, P. N., Henstock, D. R., Browne, I. W. A., Polatidis, A. G., Augusto, P., Readhead, A. C. S., ...
Using Very Long Baseline Interferometry we have searched a sample of 300 compact radio sources for examples of multiple imaging produced by gravitational lensing; no multiple images were found with...
Intrinsic intraday variability in the gravitational lens system B0218+357 (2000)
Biggs, A. D., Browne, I. W. A., Wilkinson, P. N.
Radio monitoring of the gravitational lens system B0218+357 reveals it to be a highly variable source with variations on timescales of a few days correlated in both images. This shows that the...
VLA and MERLIN monitoring observations of the gravitational lens system B1030+074 (2000)
Xanthopoulos, E., Browne, I. W. A., Patnaik, A. R., Wilkinson, P. N.
We present VLA and MERLIN monitoring data of the JVAS gravitational lens system B1030+074. The system was monitored with the VLA from February 1998 to October 1998 at 8.4-GHz during which the VLA was...
MERLIN/VLA imaging of the gravitational lens system B0218+357 (2000)
Biggs, A. D., Browne, I. W. A., Muxlow, T. W. B., Wilkinson, P. N.
Gravitational lenses offer the possibility of accurately determining the Hubble parameter (H_0) over cosmological distances, and B0218+357 is one of the most promising systems for an application of...
The JVAS/CLASS 6'' to 15'' Lens Search (2000)
Phillips, P. M., Browne, I. W. A., Wilkinson, P. N., Jackson, N. J.
We present the strategy and status of a gravitational lens search for multiple imaging with angular separations between 6'' and 15'' with the combined JVAS and CLASS data set of ~15,000 flat-spectrum...
ARCS, The Arcminute Radio Cluster-lens Search - I. Selection Criteria and Initial Results (2000)
Phillips, P. M., Browne, I. W. A., Wilkinson, P. N.
We present the results of an unbiased radio search for gravitational lensing events with image separations between 15 and 60 arcsec, which would be associated with clusters of galaxies with masses...
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....
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...
VLA 8.4-GHz monitoring observations of the CLASS gravitational lens B1933+503 (2000)
Biggs, A. D., Xanthopoulos, E., Browne, I. W. A., Koopmans, L. V. E., Fassnacht, C. D.
The complex ten-component gravitational lens system B1933+503 has been monitored with the VLA during the period February to June 1998 with a view to measuring the time delay between the four compact...
VLA 8.4-GHz monitoring observations of the CLASS gravitational lens B1933+503 (2000)
Fassnacht, C. D., Koopmans, L. V. E., Browne, I. W. A., Xanthopoulos, E., Biggs, A. D.
Submitted to: Mon. Not. R. Astron. Soc. Abstract: The complex ten-component gravitational lens system B1933+503 has been monitored with the VLA during the period February to June 1998 with a view to...
Redshifts of CLASS Radio Sources (2000)
Marlow, D. R., Rusin, D., Jackson, N., Wilkinson, P. N., Browne, I. W. A., Koopmans, L.
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 $ = 1.27$ with an RMS spread of 0.95, at a...
VLA 8.4 GHz monitoring observations of the CLASS gravitational lens B1933+503 (1999)
Browne, I. W. A., Xanthopoulos, E., Biggs, A. D., Norbury, M.
The complex 10-component gravitational lens B1933+503 has been monitored with the VLA during the period February to June 1998. Here we present the results of this A-configuration 8.4 GHz monitoring...
Xanthopoulos, E., Browne, I. W. A., Wilkinson, P. N., Jackson, N. J., Karidis, A., Porcas, R. W., ...
We present an overview of all the observations (radio - VLA, MERLIN, VLBA,EVN - and optical - WFPC2 and NICMOS -) that were initially used to confirm the gravitational lens nature of the double JVAS...
NICMOS images of JVAS/CLASS gravitational lens systems (1999)
Jackson, N. J., Xanthopoulos, E., Browne, I. W. A.
We present Hubble Space Telescope (HST) infrared images of four gravitational lens systems from the JVAS/CLASS gravitational lens survey and compare the new infrared HST pictures with previously...
B0218+357 : Time Delays and New MERLIN/VLA 5GHz Maps of the Einstein Ring (1999)
Helbig, P., Muxlow, T. W. B., Wilkinson, P. N., Browne, I. W. A., Biggs, A. D., Koopmans, L. V. E.
Abstract: This poster presents a new 5 GHz combined MERLIN/VLA map of B0218+357 which shows for the first time believable substructure in the Einstein ring. This will now be exploited for further...
Fassnacht, C. D., Pearson, T. J., Readhead, A. C. S., Browne, I. W. A., Koopmans, L. V. E., Myers, S. T., ...
We present the results of a program to monitor the four-image gravitational lens B1608+656 with the VLA. The system was observed over a seven month period from 1996 October to 1997 May. The 64 epochs...
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...
Browne, I. W. A., Wilkinson, P. N., Quast, R., Marlow, D. R., Helbig, P., Koopmans, L. V. E.
Published in: Astron. Astrophys. Suppl. Ser. 136 (1999) no. 2, pp.297-305 citations recorded in [Science Citation Index] Abstract: We present constraints on the cosmological constant $lambda_{0}$...
Helbig, P., Marlow, D. R., Quast, R., Wilkinson, P. N., Browne, I. W. A., Koopmans, L. V. E.
We present constraints on the cosmological constant $\lambda_{0}$ from gravitational lensing statistics of the Jodrell Bank-VLA Astrometric Survey (JVAS). Although this is the largest gravitational...
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,...
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...
Time delay for the gravitational lens system B0218+357 (1998)
Wilkinson, P. N., Koopmans, L. V. E., Helbig, P., Browne, I. W. A., Biggs, A. D., Perley, R. A.
Published in: Mon. Not. R. Astron. Soc. 304 (1999) 349-358 citations recorded in [Science Citation Index] Abstract: Measurement of the time delay between multiple images of a gravitational lens...
Time delay for the gravitational lens system B0218+357 (1998)
Biggs, A. D., Browne, I. W. A., Helbig, P., Koopmans, L. V. E., Wilkinson, P. N., Perley, R. A.
Measurement of the time delay between multiple images of a gravitational lens system is potentially an accurate method of determining the Hubble constant over cosmological distances. One of the most...