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Young Stellar Populations in the Collisional Ring Galaxy NGC 922

Published online by Cambridge University Press:  13 April 2010

A. Pellerin ,
G. R. Meurer ,
K. Bekki ,
D. M. Elmegreen ,
O. I. Wong  and
P. Knezek
A. Pellerin
Affiliation:
George P. and Cynthia W. Mitchell Institute for Fundamental Physics and Astronomy, Department of Physics, Texas A&M University, College Station, TX 77843, USA
G. R. Meurer
Affiliation:
Physics & Astronomy Department, Johns Hopkins University, 3400 Charles Street, Baltimore, MD 21218, USA
K. Bekki
Affiliation:
Dept. of Astrophysics & Optics, School of Physics, University of New South Wales, NSW, 2052, Australia
D. M. Elmegreen
Affiliation:
Vassar College, Department of Physics and Astronomy, Box 745, Poughkeepsie, NY 12604, USA
O. I. Wong
Affiliation:
Astronomy Department, Yale University, P.O. Box 208101, New Haven, CT 06520-8101, USA
P. Knezek
Affiliation:
WIYN Consortium Inc., PO Box 26732, Tucson, AZ 85726, USA
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Abstract

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We studied the star cluster population properties in the nearby collisional ring galaxy NGC 922 using HST/WFPC2 photometry and population synthesis modeling. We found that 69% of the detected clusters are younger than 7 Myr, and that most of them are located in the ring or along the bar, consistent with the strong Hα emission. The images also show a tidal plume pointing toward the companion. Its stellar age is consistent with pre-existing stars that were probably stripped off during the passage of the companion. We compared the star-forming complexes observed in NGC 922 with those of a distant ring galaxy from the GOODS eld. It indicates very similar masses and sizes, suggesting similar origins. Finally, we found clusters that are excellent progenitor candidates for faint fuzzy clusters.

Keywords

galaxies: individual (NGC 922)galaxies: interactionsgalaxies: star clustersgalaxies: stellar contentgalaxies: high-redshift
Type
Poster Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S262: Stellar Populations – Planning for the Next Decade , August 2009 , pp. 406 - 407
Copyright
Copyright © International Astronomical Union 2010

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