The Faint End of the Galaxy Luminosity Function in A1689: A Steep Red Faint End Upturn at z = 0.18

Details The Faint End of the Galaxy Luminosity Function in A1689: A Steep Red Faint End Upturn at z = 0.18 The Faint End of the Galaxy Luminosity Function in A1689: A Steep Red Faint End Upturn at z = 0.18

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714917b&link_type=abstract

American Astronomical Society, AAS Meeting #217, #149.17; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a deep and wide I Luminosity Function (LF) for galaxies in Abell 1689 (z=0.183) from HST WFPC2 mosaic images covering 10' on the side. The main result of this work is the detection of a steep upturn in the dwarf galaxy LF, with a faint-end slope -2. We show that the faint end upturn is dominated by red quiescent galaxies.
Evidence of luminosity segregation is presented: the dwarf-to-giant ratio appears to increase outward, but this is because giant galaxies are missing in the cluster outskirts.
It seems likely therefore that the fainter galaxies have not been accreted from the field at recent times.

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