Mathematics – Logic
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20918102c&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #181.02; Bulletin of the American Astronomical Society,
Mathematics
Logic
Scientific paper
The stellar mass function for galaxies has been measured out to redshift z 1.5, and it appears that the most massive galaxies are formed by then. However, it is not yet known if massive galaxies, those larger than log M > 11, evolve in anyway since the universe was about half its current age. To address this point we present results from the Palomar Observatory Wide-Field Infrared Survey which contains over 1.5 sq. degrees of K-band and J-band imaging to K =20.5-21 and J=23-23.5. We use this imaging, as well as DEEP2 spectroscopy and other AEGIS data sets to locate these massive galaxies out to z 1.5 and to trace their: 1. number densities and mass densities, 2. their morphological evolution and merging properties, including dry mergers, 3. their star formation rate and 4. their X-ray emission from Chandra imaging. It appears that while within the errors the most massive galaxies appear to be formed by z 1.5 there is still significant evolution for most of the population, both morphologically, in their merger rates, as well as their AGN properties. This suggests that the idea that massive galaxies are already formed by z 1 and evolve passively thereafter may need revision.
AEGIS Team
Conselice Christopher
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