Young Clusters in Virgo and Fornax Dwarf Irregulars

Details Young Clusters in Virgo and Fornax Dwarf Irregulars Young Clusters in Virgo and Fornax Dwarf Irregulars

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aspc..322..215s&link_type=abstract

The Formation and Evolution of Massive Young Star Clusters, ASP Conference Series, Vol. 322. Edited by H.J.G.L.M. Lamers, L.J.

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the results of a search for massive star clusters in dwarf irregular galaxies in the Virgo and Fornax Cluster using HST WFPC2 snapshot data. We detect 237 cluster candidates in 11 confirmed Virgo and Fornax cluster galaxies. We separated the young cluster (< 1 Gyr) candidates from the sample using their V-I color. After statistical subtraction of background and foreground sources we detect a total of 114 young cluster candidates. In addition to V and I magnitudes, we used a sequence of model cluster profiles to derive radii for the cluster candidates. Based on this information we find that most of the young cluster candidates appear to have masses between 104 and 105 solar masses and 40% are reliably resolved with rcore ˜ 2 pc. Using ground based Hα data we find that about a quarter of the young cluster candidates are most likely HII regions. Additionally we find that a large number of the young candidate clusters detected lie around the periphery of the galaxies.

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