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The Far-Infrared Properties of Optically-Selected Galaxies

Marco Viero
Stanford University

Abstract
Far-infrared/Submillimeter wavelengths provide a unique window into obscured star formation at high redshifts, with the full ensemble of dusty star-forming galaxies combining to make up the Cosmic Infrared Background (CIB). However, source confusion - a noise floor which is present in maps where the instrument resolution so large as to contain multiple sources - makes identifying individual sources and relating them to their optical counterparts incredibly challenging. Given these limitations, I will outline (relatively simple) methods designed to statistically make this connection, and I will present latest results from HerMES on the evolving infrared properties of optical/NIR-selected galaxies, and how these properties are intimately tied to their host galaxy stellar mass and redshift. I will show how the missing CIB fraction can be cleverly accounted for by considering how they bias the measurement. I will finish by presenting HeLMS and HerS, two Hershel surveys in the SDSS Stripe 82 which were designed to leverage the rich set of ancillary data in the stripe to better answer these and other exciting questions.

2016 May 03, 15:00

IA/U.Lisboa
Observatůrio Astronůmico de Lisboa (Seminar room)
Tapada da Ajuda, 1349-018 Lisboa

Instituto de Astrof√≠sica e Ci√™ncias do Espa√ßo Universidade do Porto Faculdade de Ciências da Universidade de Lisboa Funda√ß√£o para a Ci√™ncia e a Tecnologia
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