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Star clusters in the starburst galaxy M82

Published online by Cambridge University Press:  18 January 2010

Sungsoon Lim ,
Narae Hwang  and
Myung Gyoon Lee
Sungsoon Lim
Affiliation:
Department of Physics and Astronomy, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul, Republic of Korea email: slim@astro.snu.ac.kr, mglee@astro.snu.ac.kr
Narae Hwang
Affiliation:
Department of Physics and Astronomy, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul, Republic of Korea email: slim@astro.snu.ac.kr, mglee@astro.snu.ac.kr National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, Japan email: narae.hwang@nao.ac.jp
Myung Gyoon Lee
Affiliation:
Department of Physics and Astronomy, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul, Republic of Korea email: slim@astro.snu.ac.kr, mglee@astro.snu.ac.kr
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Abstract

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We present a study of star clusters in the starburst galaxy M82 using the BVI mosaic images taken with the Hubble Space Telescope's Advanced Camera for Surveys. We have selected about 850 clusters with V < 23 mag based on their morphological information. The brightest cluster is as bright as V ~ 16.5 mag (MV ~ −11.2 mag) and most clusters are fainter than V = 18 mag (MV = −9.7 mag). The V-band luminosity function is represented by a power law with a slope α ~ −2.0 in the range of −9.5 < MV < −7 mag. The star clusters in M82 are mainly distributed in the galaxy's disk. However, about a dozen clusters are found far from the disk and are considered to belong to the halo of M82. The color–magnitude diagrams of star clusters show that most star clusters are highly reddened. We have derived the age of the star clusters using a spectral-energy-distribution fitting method with Bruzual & Charlot simple stellar population models. We discuss the age distribution as well as the photometric properties of the star clusters in regard to the formation history of the M82 cluster population.

Keywords

galaxies: individual (M 82)galaxies: star clusters
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S266: Star clusters: basic galactic building blocks throughout time and space , August 2009 , pp. 454 - 457
Copyright
Copyright © International Astronomical Union 2010

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