The Star Cluster Population of the Collisional Ring Galaxy NGC 922 - Astrophysics > Cosmology and Nongalactic AstrophysicsReportar como inadecuado




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Abstract: We present a detailed study of the star cluster population detected in thegalaxy NGC922, one of the closest collisional ring galaxies known to date,using HST-WFPC2 UBVI photometry, population synthesis models, and N-body-SPHsimulations.We find that 69% of the clusters are younger than 7Myr, and thatmost of them are located in the ring or along the bar, consistent with thestrong Halpha emission. The cluster luminosity function slope of 2.1-2.3 forNGC922 is in agreement with those of young clusters in nearby galaxies. Modelsof the cluster age distribution match the observations best when clusterdisruption is considered. We also find clusters with ages >50Myr and masses>10^5 Msun that are excellent progenitors for faint fuzzy clusters. Theimages also show a tidal plume pointing toward the companion. Its stellar agefrom our analysis is consistent with pre-existing stars that were stripped offduring the passage of the companion. Finally, a comparison of the star-formingcomplexes observed in NGC922 with those of a distant ring galaxy from the GOODSfield indicates very similar masses and sizes, suggesting similar origins.



Autor: Anne Pellerin, Gerhardt R. Meurer, Kenji Bekki, Debra M. Elmegreen, O. Ivy Wong, Patricia M. Knezek

Fuente: https://arxiv.org/



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