The Astrophysical Journal Letters

The Astrophysical Journal Letters

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The Astrophysical Journal Letters Volume 678 Number 2 Create an alert RSS this journal

T. J. Davidge 2008 ApJ 678 L85 doi:10.1086/588551

An Arc of Young Stars in the Halo of M82*

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T. J. Davidge1

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Abstract References Cited By
The properties of the brightest resolved stars in an arc that was originally identified by Sun et al. and is located in the extraplanar regions of M82 are discussed. The stars form an elongated structure that is traced over a projected area of 3.0 × 0.8 kpc2. The integrated brightness is MV ~ − 11, while the total stellar mass is between 3 × 105 and 2 × 106 Msun. If there is only foreground extinction then the youngest stars have a metallicity Z ≥ 0.008 and an age log(tyr) ~ 7.75; thus, the youngest stars formed at roughly the same time as stars in tidal features that are associated with other M81 Group galaxies. If the arc disperses then it will deposit young, chemically enriched stars into the M82 halo.

Footnote
*  Based on observations obtained with the MegaPrime/MegaCam, a joint project of the CFHT and CEA/DAPNIA, at the Canada-France-Hawaii Telescope (CFHT), which is operated by the National Research Council (NRC) of Canada, the Institut National des Sciences de l'Univers of the Centre National de la Recherche Scientifique (CNRS) of France, and the University of Hawaii.
Subject headings

galaxies: evolution; galaxies: halos; galaxies: individual (M82); galaxies: starburst


Dates

Issue 2 (2008 May 10)

Received 2008 January 23, accepted for publication 2008 March 25

Published 2008 April 14



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