other query modes : |
Identifier query |
Coordinate query |
Criteria query |
Reference query |
Basic query |
Script submission |
TAP |
Output options |
Object types |
Help |
2008AJ....135...20E - Astron. J., 135, 20-54 (2008/January-0)
The outer disks of early-type galaxies. I. Surface-brightness profiles of barred galaxies.
ERWIN P., POHLEN M. and BECKMAN J.E.
Abstract (from CDS):
The profiles are derived from a variety of different sources, including the Sloan Digital Sky Survey (Data Release 5). For about half of the galaxies, we have profiles derived from more than one telescope; this allows us to check the stability and repeatability of our profile extraction and classification. The vast majority of the profiles are reliable down to levels of µR ~ 27 mag.arcsec–2; in exceptional cases, we can trace profiles down to µR>28. We can typically follow disk profiles out to at least 1.5 times the traditional optical radius R25; for some galaxies, we find light extending to ∼3xR25. For type I (single-exponential) profiles, this means that we can trace the exponential disk out to 6-7 scale lengths.
We classify the profiles into three main groups: type I (single-exponential), type II (down-bending), and type III (up-bending). The frequencies of these types are approximately 27%, 42%, and 24%, respectively, plus another 6% which are combinations of types II and III. We further classify type II profiles by where the break falls in relation to the bar length, and in terms of the postulated mechanisms for breaks at large radii ("classical truncation" of star formation versus the influence of the Outer Lindblad Resonance of the bar). We also classify the type III profiles by the probable morphology of the outer light (disk or spheroid). Illustrations are given for all cases.
Abstract Copyright: ∼
Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: spiral - galaxies: structure
Simbad objects: 67
To bookmark this query, right click on this link: simbad:2008AJ....135...20E and select 'bookmark this link' or equivalent in the popup menu