Bibcode
Aladro, R.; Gutiérrez, L.; Erwin, P.; Beckman, J. E.
Bibliographical reference
Pathways Through an Eclectic Universe ASP Conference Series, Vol. 390, proceedings of the conference held 23-27 April, 2007 at Santiago del Teide, Tenerife, Spain. Edited by J. H. Knapen, T. J. Mahoney, and A. Vazdekis San Francisco: Astronomical Society of the Pacific, 2008., p.288
Advertised on:
6
2008
Citations
0
Refereed citations
0
Description
We classify 46 broad band surface-brightness profiles in the visible
from a sample of nearby early-type unbarred galaxies imaged at the ING
(La Palma) and in the SDSS. A key result is that the fraction of these
galaxies showing truncations in their outer disks is relatively small
(of order 10%). The largest single category of galaxies show what
tet{erwin05} have termed ``Type III'' profiles, which have an
exponential inner disk, and also an exponential outer disk but with a
shallower slope. They show no sign of truncations out to beyond at least
five scale-lengths. The second most frequent category is that of
tet{free70} ``Type I'' disks, which show a single exponential slope out
to the radial limits of detection, with no sign of any truncation.
Together, Types I and III account for over 75% of the galaxies in our
sample. This is part of an ongoing program to use galaxy
surface-brightness profiles to test models of galaxy formation.