SIMBAD references

2004MNRAS.350..167M - Mon. Not. R. Astron. Soc., 350, 167-174 (2004/May-1)

Keck spectroscopy of Cosmic Lens All-Sky Survey gravitational lenses.

McKEAN J.P., KOOPMANS L.V.E., BROWNE I.W.A., FASSNACHT C.D., BLANDFORD R.D., LUBIN L.M. and READHEAD A.C.S.

Abstract (from CDS):

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 Spectrograph on the W. M. Keck-I Telescope as part of a programme to study galaxy-scale gravitational lenses. From our spectra, we found the redshift of the background source in CLASS B0128+437 (zs= 3.1240±0.0042) and the lensing galaxy redshifts in CLASS B0445+123 (z1= 0.5583±0.0003) and CLASS B0850+054 (zl= 0.5883±0.0006). Intriguingly, we also discovered that CLASS B0631+519 may have two lensing galaxies (zl,1= 0.0896±0.0001, zl,2= 0.6196±0.0004). We also found a single unidentified emission line from the lensing galaxy in CLASS B0128+437 and the lensed source in CLASS B0850+054. We find the lensing galaxies in CLASS B0445+123 and CLASS B0631+519 (l, 2) to be early-type galaxies with Einstein radii of 2.8-3.0 h–1 kpc. The deflector in CLASS B0850+054 is a late-type galaxy with an Einstein radius of 1.6 h–1 kpc.

Abstract Copyright: 2004 RAS

Journal keyword(s): gravitational lensing - quasars: individual: CLASS B0128+437 - quasars: individual: CLASS B0445+123 - quasars: individual: CLASS B0631+519 - quasars: individual: CLASS B0850+054

Simbad objects: 10

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2021.05.13-12:28:44

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