Journal article
Internal and Collective Properties of Galaxies in the Sloan Digital Sky Survey
The Astrophysical journal, v 658(2 I), pp 884-897
19 Nov 2006
Abstract
Astrophys.J.658:884-897,2007 We examine volume-limited samples from the SDSS galaxies to look for
relations among internal and collective physical parameters of galaxies as
faint as M_r=- 17.5, which include morphology, luminosity, color, color
gradient, concentration, size, velocity dispersion, equivalent width (EW) of
H_alpha line,axis ratio, the luminosity and velocity dispersion functions. At
fixed morphology and luminosity, we find that bright (M_r<-20) early-types show
very small dispersions in color, color gradient, concentration, size, and
velocity dispersion. These dispersions increase at fainter magnitudes, where
the fraction of blue early-types increases. Late-types show wider dispersions
in all physical parameters compared to early types at the same luminosity.
Concentration indices of early-types are well-correlated with velocity
dispersion, but are insensitive to luminosity and color for bright galaxies.
The slope of the Faber-Jackson relation continuously changes from 4.6 +- 0.4 to
2.7+- 0.2 when luminosity changes from M_r = -22 to -20. The size of early-
types is well-correlated with stellar velocity dispersion (for >100 km/s). We
find that passive spirals are well-separated from star-forming late-types at EW
(H_alpha) of about 4. An interesting finding is that many physical parameters
of galaxies manifest different behaviors across the absolute magnitude of about
M_* +- 1. The morphology fraction as a function of luminosity depends less
sensitively on large scale structure than the luminosity function (LF) does,
and thus seems to be more universal. The effects of internal extinction in
late-types on the completeness of volume limited samples and on the LF and
morphology fraction are found to be very important. (abridged)
Metrics
Details
- Title
- Internal and Collective Properties of Galaxies in the Sloan Digital Sky Survey
- Creators
- Yun-Young Choi - Korea Institute for Advanced StudyChangbom Park - Korea Institute for Advanced StudyMichael S Vogeley - Drexel University
- Publication Details
- The Astrophysical journal, v 658(2 I), pp 884-897
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000245405900018
- Scopus ID
- 2-s2.0-34247185294
- Other Identifier
- 991019168405304721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics