Journal
RESEARCH IN ASTRONOMY AND ASTROPHYSICS
Volume 9, Issue 11, Pages 1215-1229Publisher
NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
DOI: 10.1088/1674-4527/9/11/005
Keywords
galaxies: elliptical and lenticular, cD; galaxies: statistics; galaxies: stellar content
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Funding
- National Natural Science Foundation of China [10878010, 10221001, 10633040]
- Program for New Century Excellent Talents in University (NCET)
- National Basic Research Program (973 program) [2007CB815405]
- CNPq
- CAPES
- FAPESP
- France-Brazil CAPES/Cofecub program
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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 in 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 metalticities show a zeropoint offset of 0.5 Z(circle dot). 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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