Elliptical Galaxies with Emission Lines from the Sloan Digital Sky Survey

Details Elliptical Galaxies with Emission Lines from the Sloan Digital Sky Survey Elliptical Galaxies with Emission Lines from the Sloan Digital Sky Survey

2005-07-11

arxiv.org/abs/astro-ph/0507245v1

Chin.J.Astron.Astrophys.6:15-24,2006

Astronomy and Astrophysics

Astrophysics

Scientific paper

10.1088/1009-9271/6/1/002

We present the results of 11 elliptical galaxies with strong nebular emission lines during our study of star formation history along the Hubble sequence. After removing the dilution from the underlying old stellar populations by use of stellar population synthesis model, we derive the accurate fluxes of all emission lines for these objects, which are later classified with emission line ratios into one Seyfert 2, six LINERs and four HII galaxies. We also identify one HII galaxy (A1216+04) as a hitherto unknown Wolf-Rayet galaxy from the presence of the Wolf-Rayet broad bump at 4650 \AA. We propose that the star-forming activities in elliptical galaxies are triggered by either galaxy-galaxy interaction or the merging of a small satellite/a massive star cluster, as already suggested by recent numerical simulations.

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