Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21922904w&link_type=abstract
American Astronomical Society, AAS Meeting #219, #229.04
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the first measurements of the evolution of the group stellar mass function (GSMF) since z=1 from the Carnegie-Spitzer-IMACS (CSI) Survey. CSI combines robust mass selection through Spitzer 3.6-micron photometry with low-resolution spectroscopy over a 15 deg2 area, allowing the detailed study of large group (and group/field galaxy) samples over the expected epoch of group formation. From the initial 36,000 CSI galaxy redshifts over 5 deg2, we select groups using a standard friends-of-friends algorithm in angular and redshift space, constructing the GSMF in 3 redshift bins. These mass functions agree well with GSMFs from SDSS at z=0, and with X-ray-selected cluster mass functions at higher masses and redshifts. At all masses the GSMF evolves strongly from z=0.5-1, but only weak evolution is seen in low-mass (log M* ∼ 12.0) groups since z=0.5, indicating that most of these were in place at that epoch. As the majority of low-redshift galaxies reside in groups, the group environment may therefore play an important role in the decline in star formation and evolution of galaxy structures since z=1.
Dressler Alan
Kelson Daniel
McCarthy Patrick
Mulchaey John
Oemler Augustus Jr.
No associations
LandOfFree
Carnegie-Spitzer-IMACS Survey: The Rise of Galaxy Groups Since z=1 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Carnegie-Spitzer-IMACS Survey: The Rise of Galaxy Groups Since z=1, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Carnegie-Spitzer-IMACS Survey: The Rise of Galaxy Groups Since z=1 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1578118