Statistics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pabei..19s..72c&link_type=abstract
"Progress in Astronomy, Vol. 19, Supp., p. 72 - 75 (2001). In: Proceedings of the Fourth China-Germany Workshop on Cosmology "Co
Statistics
Ultraluminous Infrared Galaxies, Galactic Nuclei: Statistics, Active Galactic Nuclei
Scientific paper
Using photometric criterion and incorporating the global morphologies, we separated nuclei from bright star cluster associations based on an ultraluminous infrared galaxies (ULIRGs) image sample provided by HST snapshot image survey. The result supports the multi-merger as a way to form elliptical galaxies through ULIRGs phase. Comparing with the optical spectral properties, we find that the fractions of AGN in multiple, double and single nuclei/nucleus systems are 36%, 65% and 80%, respectively. Furthermore, most of the QSOs/Seyfert 1s in this sample are in single nucleus category. It indicates that the activity of galaxies could be triggered by galaxy interaction and mergers, and QSOs/Seyfert 1s tend to appear at the post merger stage. For multiple and double mergers, we find a high fraction of very close nucleus pairs. This strengthens the conclusion that systems at later merging phase preferentially host ULIRGs.
Cui Jiajia
Deng Zu-Gang
Mao Shijun
Xia Xiao-Yang
Zou Zhen-Long
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