Mathematics – Logic
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.2106s&link_type=abstract
American Astronomical Society, 188th AAS Meeting, #21.06; Bulletin of the American Astronomical Society, Vol. 28, p.853
Mathematics
Logic
1
Scientific paper
We have obtained optical--IR imaging of ~ 40 galaxy clusters in the range 0.02 < z < 0.9. Our sample traces cluster galaxy properties over nearly half a Hubble time. The imaging typically reaches 2 mag below K_*, yielding ~ 50--100 galaxies per cluster. We are using this dataset in conjunction with archival WFPC2 imaging to investigate color evolution of the elliptical galaxy population. Analysis of a subset of the clusters has been carried out using IR--selected galaxy samples. After field--correction, we calculated median optical--IR colors of the morphologically--identified ellipticals. The colors are then zeropointed to the Coma cluster using our own UBVRIzJHK photometry of an IR--selected sample. The resulting observed--frame color differences represent change from the present epoch, largely independent of model--dependent k--corrections. We find a bluing trend with redshift in the optical--IR colors, in general agreement with the standard passive evolution scenario in which ellipticals are a coeval population formed at z > 5.
Dickinson Mark Everett
Eisenhardt Peter R. M.
Stanford Spencer A.
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