The Different Physical Mechanisms that Drive the Star-Formation Histories of Giant and Dwarf Galaxies

Details The Different Physical Mechanisms that Drive the Star-Formation Histories of Giant and Dwarf Galaxies The Different Physical Mechanisms that Drive the Star-Formation Histories of Giant and Dwarf Galaxies

2007-07-09

arxiv.org/abs/0707.1262v1

Astronomy and Astrophysics

Astrophysics

29 pages, 11 figures. Accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2007.12189.x

We present an analysis of star-formation and nuclear activity in galaxies as a function of both luminosity and environment in the SDSS DR4 dataset. Using a sample of 27753 galaxies at 0.00590% complete to Mr=-18.0 we find that the EW(Ha) distribution is strongly bimodal, allowing galaxies to be robustly separated into passive and star-forming populations about a value EW(Ha)=2A. In high-density regions ~70% of galaxies are passive independent of luminosity. In the rarefied field however, the fraction of passively-evolving galaxies is a strong function of luminosity, dropping from ~50% for Mr<-21 to zero by Mr~-18. Indeed for the lowest luminosity range covered (-18

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