Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-04-06
Astrophys.J.664:738-749,2007
Astronomy and Astrophysics
Astrophysics
31 pages, 10 figures, accepted for publication in ApJ
Scientific paper
10.1086/518856
We study the dependence of the isophotal shape of early-type galaxies on their absolute B-band magnitude, their dynamical mass, and their nuclear activity and environment, using an unprecedented large sample of 847 early-type galaxies identified in the SDSS by Hao et al (2006). We find that the fraction of disky galaxies smoothly decreases with increasing luminosity. The large sample allows us to describe these trends accurately with tight linear relations that are statistically robust against the uncertainty in the isophotal shape measurements. There is also a host of significant correlations between the disky fraction and indicators of nuclear activity (both in the optical and in the radio) and environment (soft X-rays, group mass, group hierarchy). Our analysis shows however that these correlations can be accurately matched by assuming that the disky fraction depends only on galaxy luminosity or mass. We therefore conclude that neither the level of activity, nor group mass or group hierarchy help in better predicting the isophotal shape of early-type galaxies.
Pasquali Anna
Rix Hans-Walter
van den Bosch Frank C.
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