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Title:
Newly Identified Star Clusters in M33. II. Radial Hubble Space Telescope/Advanced Camera for Surveys Fields
Authors:
San Roman, Izaskun; Sarajedini, Ata; Garnett, Donald R.; Holtzman, Jon A.
Affiliation:
AA(Department of Astronomy, University of Florida, 211 Bryant Space Science Center, Gainesville, FL 32611-2055, USA ), AB(Department of Astronomy, University of Florida, 211 Bryant Space Science Center, Gainesville, FL 32611-2055, USA ), AC(801 W. Wheatridge Drive, Tucson AZ 85704, USA ), AD(New Mexico State University, Las Cruces, NM, USA )
Publication:
The Astrophysical Journal, Volume 699, Issue 1, pp. 839-849 (2009). (ApJ Homepage)
Publication Date:
07/2009
Origin:
IOP
ApJ Keywords:
galaxies: individual: M33, galaxies: spiral, galaxies: star clusters, galaxies: stellar content
DOI:
10.1088/0004-637X/699/1/839
Bibliographic Code:
2009ApJ...699..839S

Abstract

We present integrated photometry and color-magnitude diagrams (CMDs) for 161 star clusters in M33, of which 115 were previously uncataloged, using the Advanced Camera For Surveys Wide Field Channel onboard the Hubble Space Telescope. The integrated V-band magnitudes of these clusters range from MV ~-9 to as faint as MV ~-4, extending the depth of the existing M33 cluster catalogs by ~1 mag. Comparisons of theoretical isochrones to the CMDs using the Padova models yield ages for 148 of these star clusters. The ages range from log(t) ~ 7.0 to log(t) ~ 9.0. Our CMDs are not sensitive to clusters older than ~1 Gyr. We find that the variation of the clusters' integrated colors and absolute magnitudes with age is consistent with the predictions of simple stellar population models. These same models suggest that the masses of the clusters in our sample range from 5 × 103 to 5 × 104 M sun.

Based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Telescope Science Institute. STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.

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