Young stellar populations in the collisional ring galaxy NGC 922

A. Pellerin, G. R. Meurer, K. Bekki, D. M. Elmegreen, O. I. Wong, P. Knezek

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)406-407
Number of pages2
JournalProceedings of the International Astronomical Union
Issue numberS262
Publication statusPublished - Aug 2009
Externally publishedYes


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