Size, Luminosity and Stellar Mass of Compact Lensed Galaxies at Intermediate Redshift

Details Size, Luminosity and Stellar Mass of Compact Lensed Galaxies at Intermediate Redshift Size, Luminosity and Stellar Mass of Compact Lensed Galaxies at Intermediate Redshift

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21734705n&link_type=abstract

American Astronomical Society, AAS Meeting #217, #347.05; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We exploit the strong lensing effect to explore the properties of intrinsically faint and compact galaxies at intermediate redshift, at the highest possible resolution at optical wavelengths. We model 46 strongly-lensed emission line galaxies discovered by the Sloan Lens ACS (SLACS) Survey, using KLENS, a quick and robust new code which we test extensively on real and synthetic non-lensed galaxies, and also on simulated lenses. We are able to infer their size, luminosity, and stellar mass using stellar population synthesis models. Modeling the SLACS sources reveals a population of galaxies with colors and Sersic indices (median n 1) consistent with the objects detected in the field with HST in the GEMS survey, but that are (typically) 2 magnitudes fainter and 5 times smaller in apparent size. The closest analog to the population we see are the ultra-compact emission line galaxies identified by HST grism surveys. The lowest mass galaxies in our sample are comparable in stellar mass to the brightest Milky Way satellites (107 M &sun;) and have well-determined half light radii of 0.05 arcsec (≈ 0.3 kpc).
TT and ERN acknowledge support from the NSF through CAREER award NSF-0642621, and from the Packard Foundation through a Packard Research Fellowship. PJM is grateful to the TABASGO and Kavli foundations for support in the form of two research fellowships.

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