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OATS-UNI/TS SEMINAR
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Speaker: Giulia Rodighiero (Dip. Fisica e Astron. - Univ. Padova)
Title: A galaxy's life in and out the main-sequence of star-forming galaxies at z~2
Date: Wednesday, May 2nd, 2012
Time: 11:30
Venue: Villa Bazzoni
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Abstract:
I will review recent results obtained by the PACS Evolutionary Probe
(PEP) extragalactic survey. PEP covers popular multiwavelength fields
from wide (COSMOS, 2 deg2) to deep, pencil-beam observations (e.g.
GOODS-N/S) and lensing galaxy clusters at 70, 100 and 160 microns.
Herschel observations break the confusion limit of previous infrared
space telescopes and cover the whole flux range from ~1 mJy to 200
mJy, thus resolving more than 70% (55%) of the Cosmic IR background
(CIB) at 160 microns (100 micron).
Combining PACS-derived calorimetric star formation rates and ancillary
datasets (e.g. high-resolution ACS imaging, deep Chandra X-ray maps
and spectroscopy at several wavelengths), we perform a highly complete
sampling of the properties of star forming galaxies: their SEDs,
structure, extinction, timescale of star formation, and possible AGN
components, across the so-called star-forming "main-sequence" from
redshift z~2.5 to the local Universe.
Among the results that I will present, our analyses show that at each
mass and redshift galaxies on the main sequence have the largest size
and are well approximated by exponential disks. A well defined
correlation between structure and stellar populations is already in
place since at least z~2.5. Objects off the main sequence, hosting
merger-driven starbursts, represent only less than 5% of mass-selected star
forming galaxies, thus playing a relatively minor role in the
formation of stars in galaxies.
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Contact: Pierluigi Monaco (DAUTS)