Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..380...75v&link_type=abstract
At the Edge of the Universe: Latest Results from the Deepest Astronomical Surveys ASP Conference Series, Vol. 380, proceedings o
Physics
Scientific paper
High redshift galaxies play a key role in our developing understanding of galaxy formation and evolution. Since such galaxies are being studied within a Gyr after the big bang they provide a unique probe of the physics of one of the first generations of large-scale star-formation. We describe a study of high redshift galaxies selected from the deep, multiwavelength GOODS survey in the Chandra Deep Field South. Using the Lyman-break technique we have identified a robust sample of z˜5 UV luminous star-forming galaxies for which we present a complete statistical study of their physical properties as derived from their rest-frame UV-to-visible SEDs. The characteristic properties of this sample differ from LBGs at z˜3 of comparable luminosity in that they are a factor of ten less massive (˜few×10^9 M&sun;) and the majority (˜70%) are considerably younger (<100 Myr). We estimate the contribution of this young population to the global star formation rate and stellar mass density of the universe at z˜5. The constraint derived for the latter is affected by their young ages and short duty cycles which imply z˜5 LBG samples may be highly incomplete. These intense starbursts have high unobscured star formation rate intensities (˜100s M&sun; yr-1 kpc-2), suggesting they drive outflows and winds that enrich the intra- and inter-galactic media with metals. These properties imply that the majority of z˜5 LBGs are `in formation' meaning that most of their star-formation has likely occurred during the last few crossing times. They are experiencing their first (few) generations of large-scale star formation and are accumulating their first significant stellar mass. As such, z˜5 LBGs are the likely progenitors of the spheroidal components of present-day massive galaxies (supported by their high stellar mass surface densities and their core phase-space densities).
Bremer Malcolm
Douglas Laura
Forster Schreiber Natascha
Lehnert Matt
Verma Amit
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