Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 419, Issue 4, Pages 3018-3027Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2011.19938.x
Keywords
galaxies: evolution; galaxies: formation; galaxies: fundamental parameters; galaxies: high-redshift; galaxies: statistics; large-scale structure of Universe
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Funding
- W.M. Keck Foundation
- NASA [NAS 5-26555, HF-51269.01-A, HST-G0-10134.13-A]
- Space Telescope Science Institute
- NSF [AST-0507428, AST-0507483, AST-0071048, AST-0071198, AST-0808133, AST-0806732]
- Hubble Space Telescope Archival grant [HST-AR-10947.01]
- Spitzer Space Telescope Fellowship
- Southern California Center for Galaxy Evolution
- University of California Office of Research
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [808133] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [0806732] Funding Source: National Science Foundation
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Using data drawn from the DEEP2 and DEEP3 Galaxy Redshift Surveys, we investigate the relationship between the environment and the structure of galaxies residing on the red sequence at intermediate redshift. Within the massive (10 < log10(M/h(-2) M) < 11) early-type population at 0.4 < z < 1.2, we find a significant correlation between local galaxy overdensity (or environment) and galaxy size, such that early-type systems in higher density regions tend to have larger effective radii (by similar to 0.5 h-1 kpc or 25 per cent larger) than their counterparts of equal stellar mass and Sersic index in lower density environments. This observed sizedensity relation is consistent with a model of galaxy formation in which the evolution of early-type systems at z < 2 is accelerated in high-density environments such as groups and clusters and in which dry, minor mergers (versus mechanisms such as quasar feedback) play a central role in the structural evolution of the massive, early-type galaxy population.
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