Galaxy-Galaxy Lensing


Prof. Adam Bolton and postdoc Dr. Joel Brownstein are exploiting the unique wide-field spectroscopic capability of the Apache Point Observatory's 2.5-meter telescope, currently using the Baryon Oscillation Spectroscopic Survey (BOSS) of the Sloan Digital Sky Survey III (SDSS3) to discover new strong gravitational galaxy lenses. In conjunction with follow-up Hubble Space Telescope (HST) multi-color images of the galaxy lenses detected in the Sloan Lens ACS (SLACS) survey, we are providing constraints on structure formation and galaxy evolution problems.

0BOSS will gather spectra of 1.5 million luminous red galaxies out to a redshift of z=0.7 across 10,000 square degrees of the sky, and 160,000 quasars at redshifts 2.2 < z < 3, across 8,000 square degrees of the sky. These maps are needed to make improved measurements of the expanding Universe and Dark Energy content.