Program: GS-2024A-Q-320
| Title: | A Galaxy Redshift Survey of the Line-of-Sight Environment of two quadruply imaged Lensed Quasars |
| PI: | Elizabeth Buckley-Geer |
| Co-I(s): | Huan Lin, Anowar Shajib, Emory Murff, Dominique Sluse |
Abstract
Quadruply imaged quasars (hereafter quads) are a particularly powerful manifestation of strong lensing for the study of the dark universe. The time delays between multiple images provide a direct measurement of cosmic distances, and thus of the Hubble Constant and other cosmological parameters. Recent results based on the blind analysis of seven systems presented limits on the Hubble constant H_0 that are competitive and complementary with established methods such as Cepheids, Baryonic Acoustic Oscillations and Supernovae Ia. One of the key components is characterization of the mass distribution along the line of sight. Our goal will be to use GMOS-S to target about half the i < 23 galaxies within a 3-arcmin radius around two quad systems, GRAL J1131-4419 and GRAL J1651-0417.