Discovery of an Evolved Galaxy Cluster at z>2

Details Discovery of an Evolved Galaxy Cluster at z>2 Discovery of an Evolved Galaxy Cluster at z>2

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..399..363o&link_type=abstract

Panoramic Views of Galaxy Formation and Evolution ASP Conference Series, Vol. 399, proceedings of the conference held 11-16 Dece

Astronomy and Astrophysics

Astronomy

Scientific paper

Over a 1,000-arcmin^2 field imaged with the Spitzer/IRAC, we have discovered a candidate galaxy cluster at z>2 with extremely red, evolved galaxies concentrated within an area of only 30 arcsec in diameter. The cluster candidate shows an extended x-ray emission with L_{X}(0.1-2.4 keV) ˜eq 10^{44} erg s^{-1} likely to be associated with cluster potential. Among the galaxies with meaningful photometric redshifts, 20 galaxies in this region are consistent with photometric redshift of z_{phot}=2.15±0.2. Their rest-frame optical colors are consistent with those of red-sequence galaxies with 1-3 Gyr stellar populations, reaching (z-K)_{AB}˜eq 4. Compared with the passively evolving field galaxies at similar redshifts, these colors are typically ˜eq1 magnitude redder, indicating the presence of a strong environmental effect on the evolution of stellar populations at high redshift.

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