Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..381..351p&link_type=abstract
The Second Annual Spitzer Science Center Conference: Infrared Diagnostics of Galaxy Evolution. ASP Conference Series, Vol. 381,
Astronomy and Astrophysics
Astronomy
Scientific paper
I discuss constraints on star-formation and AGN in massive, red galaxies at z˜1-3 using Spitzer observations at 3-24 µ. In particular I focus on a sample of distant red galaxies (DRGs) with jmk>2.3 in the southern Great Observatories Origins Deep Survey (GOODS-S) field. The DRGs have typical stellar masses mcal≳10^{11} M_{&sun;}. Interestingly, the majority (≳50%) of these objects have 24 µ flux densities ≳50 ujy. At these redshifts massive galaxies undergo intense (and possibly frequent) IR-active phases, which is in constrast to lower-redshift massive galaxies. If the 24 µ emission in these z˜1-3 galaxies is attributed to star formation, then it implies star-formation rates (SFRs) in excess of ≃100 msol\ yr^{-1}. These galaxies have specific SFRs equal to or exceeding the global average value at that epoch. Thus, this is an active period in their assembly. Based on their X-ray luminosities and near-IR colors, as many as 25% of the massive galaxies at z≳ 1.5 host AGN, suggesting that the growth of supermassive black holes coincides with massive-galaxy assembly.
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