Stellar ages and metallicities of nearby elliptical galaxies

Details Stellar ages and metallicities of nearby elliptical galaxies Stellar ages and metallicities of nearby elliptical galaxies

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009raa.....9.1215t&link_type=abstract

Research in Astronomy and Astrophysics, Volume 9, Issue 11, pp. 1215-1229 (2009).

Astronomy and Astrophysics

Astrophysics

Scientific paper

Stellar ages and metallicities are crucial for understanding the formation and evolution of elliptical galaxies. However, due to the age--metallicity degeneracy, it is hard to measure these two parameters accurately with broad-band photometry. In this paper, we observed high-resolution spectra for a sample of 20 nearby elliptical galaxies (EGs) with the NAOC 2.16 m telescope, and determined stellar ages and metallicities by using the empirical population synthesis and Lick/IDS index system methods. We found that stellar ages from these two methods are consistent with each other for purely old EGs; however, stellar metallicities show a zeropoint offset of 0.5 Zodot. Our results confirm that stellar populations in low-density environment galaxies are more diverse compared to their high-density counterparts. We also investigated the element abundance--galaxy mass relation for nearby elliptical galaxies.

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