Massive and Evolved Galaxies at z⪆5

Details Massive and Evolved Galaxies at z⪆5 Massive and Evolved Galaxies at z⪆5

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..380..327w&link_type=abstract

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

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We search for massive and evolved galaxies at z ≥ 5 in the Great Observatories Origins Deep Survey (GOODS) southern field. Combining HST ACS, VLT ISAAC and Spitzer IRAC broad--band photometric data, we develop a color selection technique to identify candidates for being evolved galaxies at high redshifts. The color selection is primarily based on locating the Balmer--break using the K- and 3.6μm bands. Stellar population synthesis models are fitted to the SEDs of these galaxies to identify the final sample. We find 11 candidates with photometric redshifts in the range 4.9 < z < 5.6, dominated by an old stellar population, with ages 0.2-1.0 Gyr, and stellar masses in the range (0.7 - 5) × 1011 M&sun;. Most of the candidates have modest amounts of internal dust extinction. The majority of the stars in these galaxies were formed at z > 9 and the current star formation activity is a few percent of the inferred initial star formation rate.

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