Towards the full characterization of rapidly assembling low-mass galaxies out to z=1
by
Ricardo Amorin(INAF-Rome)
→
Europe/Stockholm
FA31
FA31
Description
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.
