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Gemini Deep Deep Survey VI: Massive post-starburst galaxies at z=1 | | Damien Le Borgne
; Roberto Abraham
; Kathryne Daniel
; Patrick McCarthy
; Karl Glazebrook
; Sandra Savaglio
; David Crampton
; Stephanie Juneau
; Ray Carlberg
; Hsiao-Wen Chen
; Ronald O. Marzke
; Kathy Roth
; Inger Jorgensen
; Richard Murowinski
; | | Date: |
17 Mar 2005 | | Subject: | astro-ph | | Affiliation: | 5,4), Ray Carlberg , Hsiao-Wen Chen , Ronald O. Marzke , Kathy Roth , Inger Jorgensen , Richard Murowinski ( Univ. of Toronto, John Hopkins Univ., Carnegie Obs., NRS Herzberg Institute, Univ. of Montreal, Center for Space Sciences, San Francisc | | Abstract: | We show that there has been a dramatic decline in the abundance of massive post-starburst galaxies from z=1.2 to the present. Combining data from the Gemini Deep Deep and the Sloan Digital Sky Surveys to make mass-matched samples (M*>=10^10.2 Msun), we find that the fraction of galaxies in a post-starburst phase, identified by their strong Hdelta absorption lines, has decreased from about 50% at z=1.2 to a few percent today. This trend originates from a (1+z)^{2.5 pm 0.7} evolution in the distribution of Hdelta equivalent widths for massive galaxies. With few exceptions, the local and the distant massive post-starburst galaxies have high visual extinction and young luminosity-weighted ages. Spectral synthesis studies of the high-redshift population using the PEGASE code, treating HdeltaA, EW[OII], Dn4000, and rest-frame colors, favor models in which these massive Hdelta-strong systems reveal the echoes of intense episodes of star-formation that faded ~1 Gyr prior to the epoch of observation on time-scales shorter than a few hundred million years. The z=1.4-2 epoch appears to be a time at which massive galaxies transition from a mode of sustained star formation to a quiet mode with weak and rare star-formation episodes. We argue that the most likely local counterparts for the distant massive post-starburst galaxies are passively evolving massive galaxies in the field and small groups. | | Source: | arXiv, astro-ph/0503401 | | Services: | Forum | Review | PDF | Favorites | |
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