D. Harbeck, J. Gallagher III, D. Crnojević
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 ($\ge 10 \time 10^5$ \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.
View original:
http://arxiv.org/abs/1202.5004
No comments:
Post a Comment