Candels Observations Of The Relation Between Galaxy Color, Stellar Mass, And Morphology With Environment At Z=1.6

Details Candels Observations Of The Relation Between Galaxy Color, Stellar Mass, And Morphology With Environment At Z=1.6 Candels Observations Of The Relation Between Galaxy Color, Stellar Mass, And Morphology With Environment At Z=1.6

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21942905b&link_type=abstract

American Astronomical Society, AAS Meeting #219, #429.05

Mathematics

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Scientific paper

We study the relationship between color, stellar mass, morphology, and environment for a sample of galaxies at z = 1.6 selected from the CANDELS data in the UKIDSS Ultradeep Survey. For each galaxy in this sample, we quantify the morphology using the Sersic index as measured by GALFIT from the WFC3 F125W images. We quantify the environment using the projected distance to the 7th nearest neighbor, d7. Several trends appear between color, mass, Sersic index, and environment. Compared to galaxies in low density regions, bulge dominated (n > 2) galaxies in high density regions (d7 < 0.7 Mpc) lie almost exclusively on the red sequence: there are very few star-forming, bulge dominated galaxies in high density regions. Furthermore, we find a lack of low mass (M < 3 × 1010 M&sun;), bulge-dominated red-sequence galaxies in the low-density regions, while these are clearly present in the high density regions. We explore these trends further by selecting only the quiescent galaxies using a color-color selection. We find that quiescent galaxies in the high density regions are nearly all bulge dominated (only 3/23 galaxies, are apparently disk dominated with n < 2). In contrast, in the low density regions roughly 20% of the quiescent galaxies are disk dominated. These results provide evidence that galaxies in high density regions experience accelerated assembly histories, which both accelerates morphological evolution (faster transition to bulge-dominated galaxies) and may also cause faster cessation of star formation, producing more low mass red galaxies.

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