Astron. J., 119, 451-459 (2000/February-0)
A Keck survey of gravitational lens systems. I. Spectroscopy of SBS 0909+532, HST 1411+5211, and CLASS B2319+051.
LUBIN L.M., FASSNACHT C.D., READHEAD A.C.S., BLANDFORD R.D. and KUNDIC T.
Abstract (from CDS):
We present new results from a continuing Keck program designed 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 of these systems, either the source or lens redshift (or both) has been previously unidentified. Our observations provide some of these missing redshifts. We find (zl,z_s_)=(0.830,1.377) for SBS 0909+532; (zl,zs)=(0.465,2.811) for HST 1411+5211, although the source redshift is still tentative; and (z_l,1_,z_l,2_)=(0.624,0.588) for the two lensing galaxies in CLASS B2319+051. The background radio source in B2319+051 has not been detected optically; its redshift is, therefore, still unknown. We find that the spectral features of the central lensing galaxy in all three systems are typical of an early-type galaxy. The observed image splittings in SBS 0909+532 and HST 1411+5211 imply that the masses within the Einstein ring radii of the lensing galaxies are 1.4x1011 and 2.0x1011 h–1 M☉, respectively. The resulting B-band mass-to-light ratio (M/L) for HST 1411+5211 is 41.3±1.2 h (M/L)☉, a factor of ∼5 times higher than the average early-type lensing galaxy. This large mass-to-light ratio is almost certainly the result of the additional mass contribution from the cluster CL 3C 295 at z=0.46. For the lensing galaxy in SBS 0909+532, we measure (M/L)B=4+11–3 h (M/L)☉, where the large errors are the result of significant uncertainty in the galaxy luminosity. While we cannot measure directly the mass-to-light ratio of the lensing galaxy in B2319+051, we estimate that (M/L)B is between 3-7 h (M/L)☉.
Cosmology: Distance Scale - Galaxies: Distances and Redshifts - Cosmology: Gravitational Lensing - quasars: individual (CLASS 2319+051, HST 1411+5211, SBS 0909+532)
Text, Fig.7, Table 1: objects are [RMN2001] CLASS B2319+051 A or [RMN2001] CLASS B2319+051 GNa.
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