Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 389, Issue 4, Pages 1791-1804Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2008.13660.x
Keywords
galaxies : active; galaxies : elliptical and lenticular; cD; galaxies : evolution; galaxies : general; galaxies : spiral; galaxies : statistics
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Funding
- Korea Science and Engineering Foundation (KOSEF) [R01-2007-000-203360]
- Alfred P. Sloan Foundation
- Participating Institutions
- National Science Foundation
- U. S. Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max-Planck Society
- Higher Education Funding Council for England
- Ministry of Education, Science & Technology (MoST), Republic of Korea [2008131000, PG016902] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [R11-2002-096-01001-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We present a comprehensive study of the nature of the Sloan Digital Sky Survey (SDSS) galaxies divided into various classes based on their morphology, colour and spectral features. The SDSS galaxies are classified into early-type and late-type; red and blue; passive, H II, Seyfert and LINER, returning a total of 16 fine classes of galaxies. We examine the luminosity dependence of seven physical parameters of galaxies in each class. We find that more than half of red early-type galaxies (REGs) have star formation or active galactic nuclei activity, and that these active REGs have smaller axis ratio and bluer outside compared to the passive REGs. Blue early-type galaxies (BEGs) show structural features similar to those of REGs, but their centres are bluer than REGs. H II BEGs are found to have bluer centres than passive BEGs, but H II REGs have bluer outside than passive REGs. Bulge-dominated late-type galaxies have red colours. Passive red late-types are similar to REGs in several aspects. Most blue late-type galaxies (BLGs) have forming stars, but a small fraction of BLGs do not show evidence for current star formation activity. Differences of other physical parameters among different classes are inspected, and their implication on galaxy evolution is discussed.
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