Intermediate Old Star Clusters in a Young Starburst: The case of NGC 5253
D. Harbeck, J. Gallagher III, and D. Crnojevi\'c
TL;DR
This study uses Hubble Space Telescope data to identify and analyze star clusters in NGC 5253, revealing evidence of past star formation episodes and the galaxy's complex starburst history.
Contribution
It provides the first detailed analysis of outer star clusters in NGC 5253, highlighting potential ancient massive clusters and past star formation activity.
Findings
Identification of three massive star clusters aged 1-2 Gyr
Evidence of a high historical star formation rate
Supports the idea of multiple starburst episodes in NGC 5253
Abstract
We investigate the star cluster population in the outer parts of the starburst galaxy NGC 5253 using archive images taken with the Hubble Space Telescope's Advanced Camera for Surveys. Based on the F415W, F555W, and F814W photometry ages and masses are estimated for bona-fide star cluster candidates. We find three potentially massive ( \Msun) star clusters at ages of order of 1-2 Gyr, implying, if confirmed, a high global star formation rate in NGC 5253 during that epoch. This result underlines earlier findings that the current star burst is just one episode in an very active dwarf galaxy.
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