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Towards the full characterization of rapidly assembling low-mass galaxies out to z=1
  Astronomy and astrophysics

Friday 23 May 2014
from 10:30 to 11:30
at FA31
Speaker : Ricardo Amorin (INAF-Rome)
Abstract : Galaxies showing early and significant stages of mass assembling are key objects for understanding galaxy evolution. Being rare in the local universe, deep surveys have recently revealed an increasing population of extremely compact, low-mass, actively star-forming galaxies out to z=1. These rapidly growing systems offer the ideal laboratories for studying the details of massive star formation, feedback and chemical enrichment under physical conditions likely resembling those in galaxies at higher redshift. In this seminar, I will review recent progress on the detailed spectrophotometric characterization of these unique objects. In particular, I will present new results from two unprecedentedly large and representative samples of extreme emission-line galaxies at z<1 assembled from the zCOSMOS-20k Bright Survey and the VIMOS Ultra Deep Survey (VUDS). Selected on the basis of their unusually high emission-line equivalent widths, we find these galaxies experiencing a transient and probably early period of their evolution, where they efficiently build-up most of their present-day stellar mass in an ongoing galaxy-wide starburst. The two samples are complementary, including galaxies as faint as B~ -14 and spanning a wide range of stellar mass, star formation rate and metallicity. I will discuss these properties along with their HST morphology and environment, which will serve to investigate the low-mass end of fundamental relations involving mass, metallicity and SFR over the last 8 billion years.

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