For refcode 2010ApJ...720.1674S: Retrieve 2989 NED objects in this reference. Please click here for ADS abstract
NED Abstract
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2010ApJ...720.1674S
Photometric Properties of the M33 Star Cluster System
San Roman, Izaskun; Sarajedini, Ata; Aparicio, Antonio
Abstract. We present a catalog of 2990 extended sources in a 1^degree^ x
1^degree^ area centered on M33 using the MegaCam camera on the 3.6 m
Canada-France-Hawaii Telescope. The catalog includes 599 new candidate
stellar clusters, 204 previously confirmed clusters, 1969 likely
background galaxies, and 218 unknown extended objects. We present ugriz
integrated magnitudes of the candidates and confirmed star clusters (SCs)
as well as the full width at half maximum, ellipticity, and stellarity.
Based on the properties of the confirmed SCs, we select a sub-sample of
highly probable clusters composed of 246 objects. The integrated
photometry of the complete cluster catalog reveals a wide range of colors
of --0.4 < (g -- r) < 1.5 and --1.0 < (r -- i) < 1.0 with no obvious
cluster subpopulations. Comparisons with models of simple stellar
populations suggest a large range of ages some as old as ~10 Gyr. In
addition, we find a sequence in the color-color diagrams that deviates
from the expected direction of evolution. This feature could be associated
with very young clusters (<10^7^ yr) possessing significant nebular
emission. Analysis of the radial density distribution suggests that the
cluster system of M33 has suffered from significant depletion possibly due
to interactions with M31. We also detect a gap in the cluster distribution
in the color-color diagram at (g -- r) ~= 0.3 and (u -- g) ~= 0.8. This
gap could be interpreted as an evolutionary effect. This complete catalog
provides promising targets for deep photometry and high-resolution
spectroscopy to study the structure and star formation history of M33.
Key words: galaxies: individual: M33, galaxies: spiral, galaxies: star
clusters: general, galaxies: stellar content
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