Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-11-17
Astronomy and Astrophysics
Astrophysics
Proceedings of the 6th RESCEU international symposium, 4-7 Nov. 2003, Tokyo, Japan
Scientific paper
E+A galaxies are galaxies with strong Balmer absorption lines and with no significant emission in [OII] or H$\alpha$ lines. The existence of strong Balmer absorption lines shows that these galaxies have experienced a starburst within the last 1 Gyr. At the same time, these galaxies do not show any sign of on-going star formation as indicated by the lack of [OII] or H$\alpha$ emission lines. Therefore, E+A galaxies are interpreted as a post-starburst galaxy -- a galaxy which truncated starburst suddenly. However, for more than 20 years, the origin of this post-starburst phenomena remained a mystery. Using the 100,000 galaxy spectra of the Sloan Digital Sky Survey Data Release 1, we tested three popular explanations to the E+A phenomenon.
collaboration the SDSS
Goto Tomotsugu
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