Environmental dependence of galaxy age in the Main galaxy sample of SDSS DR10
Xin-Fa Deng
TL;DR
This study examines how galaxy age correlates with environment using SDSS DR10 data, finding older galaxies in dense regions and younger ones in less dense areas, influenced by stellar mass relations.
Contribution
It demonstrates the environmental dependence of galaxy age in SDSS DR10, highlighting the combined effects of age-stellar mass and mass-density relations.
Findings
Old galaxies are in dense regions.
Young galaxies are in low-density regions.
The age-density relation is influenced by stellar mass relations.
Abstract
Using two volume-limited Main galaxy samples of the Sloan Digital Sky Survey Data Release 10 (SDSS DR10), I investigate the environmental dependence of galaxy age, and get the same conclusions in two volume-limited Main galaxy samples: old galaxies exist preferentially in the densest regions of the universe, while young galaxies are located preferentially in low density regions. Such an age-density relation is likely a combination of a strong age-stellar mass relation and the stellar mass-density relation.
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Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Astronomy and Astrophysical Research · Stellar, planetary, and galactic studies