The Astronomical Journal

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Paul B. Eskridge et al. 2008 The Astronomical Journal 135 120 doi:10.1088/0004-6256/135/1/120

STAR CLUSTERS IN THE NEARBY LATE-TYPE GALAXY NGC 1311*

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Paul B. Eskridge1, Richard de Grijs2,3, Peter Anders4, Rogier A. Windhorst5, Violet A. Mager6,7 and Rolf A. Jansen5

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Abstract References Cited By

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 ~103 Msun up to ~105 Msun, 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 ${\ga}1$ Gyr. The ranges of age and mass we probe are consistent with those of the star clusters found in quiescent Local Group dwarf galaxies.


Footnote
*  Based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract no. NAS5-26555.
Keywords

galaxies: individual (NGC 1311); galaxies: spiral; galaxies: star clusters; infrared: galaxies; ultraviolet: galaxies


Dates

Issue 1 (2008 January)

Received 2007 May 28, accepted for publication 2007 October 14

Published 2007 December 7



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