Mathematics – Logic
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.2003p&link_type=abstract
American Astronomical Society, AAS Meeting #211, #20.03; Bulletin of the American Astronomical Society, Vol. 39, p.771
Mathematics
Logic
Scientific paper
We studied the dependence of morphology and luminosity of the SDSS galaxies on the environmental factors, and present a unified picture on the evolution of galaxy luminosity and morphology. The environmental factors considered include the local density due to the nearest neighbor galaxy rho_n, morphology of the nearest neighbor, and the large-scale background density.
We found the local environment set up by the nearest neighbor galaxy gives stong effects on the galaxy morphology. The probability for a galaxy to have an early morphological type critically depends on whether or not rho_n is above the virialization density. Large part of the morphology-local density relation is due to the correlation between rho_n and the large-scale background density.
We also found that galaxy luminosity depends on rho_n, and that more isolated galaxies are more likely to be recent merger products. We propose a scenario that a series of morphology and luminosity transformation occur through distant interactions and mergers, which results in the morphology-luminosity-local density relation.
Choi Yemon
Gott J.
Park Changbom
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