Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-10-18
Astron.J.135:120-129,2008
Astronomy and Astrophysics
Astrophysics
21 pages, 11 figures, accepted by AJ
Scientific paper
10.1088/0004-6256/135/1/120
Ultraviolet, optical and near infrared images of the nearby (D ~ 5.5 Mpc) SBm galaxy NGC 1311, obtained with the Hubble Space Telescope, reveal a small population of 13 candidate star clusters. We identify candidate star clusters based on a combination of their luminosity, extent and spectral energy distribution. The masses of the cluster candidates range from ~1000 up to ~100000 Solar masses, and show a strong positive trend of larger mass with increasing with cluster age. Such a trend follows from the fading and dissolution of old, low-mass clusters, and the lack of any young super star clusters of the sort often formed in strong starbursts. The cluster age distribution is consistent with a bursting mode of cluster formation, with active episodes of age ~10 Myr, ~100 Myr and ~1 Gyr. The ranges of age and mass we probe are consistent with those of the star clusters found in quiescent Local Group dwarf galaxies.
Anders Peter
de Grijs Richard
Eskridge Paul B.
Jansen Rolf A.
Mager Violet A.
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