Results from the CASTLES survey of gravitational lenses
Abstract
We show that most gravitational lenses lie on the passively evolving fundamental plane for early-type galaxies. For burst star formation models (1 Gyr of star formation, then quiescence) in low Ω0 cosmologies, the stellar populations of the lens galaxies must have formed at zf>~2. Typical lens galaxies contain modest amounts of patchy extinction, with a median differential extinction for the optical (radio) selected lenses of ΔE(B-V)=0.04(0.07) mag. The dust can be used to determine both extinction laws and lens redshifts. For example, the zl=0.96 elliptical lens in MG0414+0534 has an RV=1.7+/-0.1 mean extinction law. Arc and ring images of the quasar and AGN source host galaxies are commonly seen in NICMOS H band observations. The hosts are typically blue, L<~L* galaxies.
- Publication:
-
After the Dark Ages: When Galaxies were Young (the Universe at 2 < Z < 5)
- Pub Date:
- April 1999
- DOI:
- 10.1063/1.58598
- arXiv:
- arXiv:astro-ph/9811111
- Bibcode:
- 1999AIPC..470..163K
- Keywords:
-
- 98.62.Sb;
- 98.80.Es;
- Gravitational lenses and luminous arcs;
- Observational cosmology;
- Astrophysics
- E-Print:
- 12 pages, 10 figures, from Proceedings of the 9th Annual Astrophysics Conference in Maryland, After the Dark Ages: When Galaxies Were Young