Tracing the Life Cycle of Massive Red Galaxies

Details Tracing the Life Cycle of Massive Red Galaxies Tracing the Life Cycle of Massive Red Galaxies

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..380..405d&link_type=abstract

At the Edge of the Universe: Latest Results from the Deepest Astronomical Surveys ASP Conference Series, Vol. 380, proceedings o

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Samples of Extremely Red Galaxies (ERGs) are usually found to be a mix of actively star-forming galaxies with significant dust reddening and evolved, passive galaxies, at redshifts about z˜1-2. Initial results from deep Keck spectroscopy of ERGs tep{doh:doh05} revealed dominant old stellar populations in the majority of our spectroscopic sample, but only a third have spectra with no evidence of recent star formation activity. This study suggests that the bulk of the ERGs are luminous, spheroidal, evolved galaxies, but with intermittent activity consistent with continued growth. Through template fitting of the spectra and broad-band spectral energy distributions, combined with morphological analysis and Spitzer archival observations we investigate a subset of these objects in detail, to address various outstanding questions. What fraction of their mass is produced in ongoing star formation? Is there a characteristic mass at which star formation is abruptly truncated? What mechanism provokes a secondary burst of star formation in evolved galaxies?

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