Newly Identified Star Clusters in M33. II. Radial HST/ACS Fields

Details Newly Identified Star Clusters in M33. II. Radial HST/ACS Fields Newly Identified Star Clusters in M33. II. Radial HST/ACS Fields

2009-04-28

arxiv.org/abs/0904.4287v1

Astrophys.J.699:839-849,2009

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

28 pages, 12 figures, accepted for publication in The Astrophysical Journal

Scientific paper

10.1088/0004-637X/699/1/839

We present integrated photometry and color-magnitude diagrams 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 color-magnitude diagrams 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 color-magnitude diagrams 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 5x10^3 to 5x10^4 *Msun.

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