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SDSS J131339.98+515128.3: A new gravitationally lensed quasar selected based on near-infrared excess
E. O. Ofek, M. Oguri, N. Jackson +2
We report the discovery of a new gravitationally lensed quasar, SDSS J131339.98+515128.3, at a redshift of 1.875 with an image separation of 1.24". The lensing galaxy is clearly de…
The Hubble Constant
Neal Jackson
I review the current state of determinations of the Hubble constant, which gives the length scale of the Universe by relating the expansion velocity of objects to their distance. T…
A survey of polarization in the JVAS/CLASS flat-spectrum radio source surveys: I. The data and catalogue production
N. Jackson, R. A. Battye, I. W. A. Browne +3
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. Th…
A search for the third lensed image in JVAS B1030+074
M. Zhang, N. Jackson, R. W. Porcas +1
Central gravitational image detection is very important for the study of the mass distribution of the inner parts ( pc) of lens galaxies. However, the detection of such i…
The Cosmic Lens All-Sky Survey parent population - I. Sample selection and number counts
J. P. McKean, I. W. A. Browne, N. J. Jackson +2
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) gravit…
Near-infrared spectra of Seyfert galaxies and line production mechanisms
N. Jackson, R. Beswick
New observations are reported of J-band spectra (1.04micron -- 1.4 micron) of three Seyfert 2 galaxies, Mkn 34, Mkn 78 and NGC 5929. In each case the spectral range includes the ne…