TL;DR
This paper studies a stellar arc in M82's halo, analyzing its properties, composition, and potential dispersal, revealing insights into star formation and galactic interactions in the M81 Group.
Contribution
It provides detailed characterization of the stellar arc in M82, including its structure, stellar populations, and implications for galaxy evolution and star formation history.
Findings
The arc spans 3.0 x 0.8 kpc with an integrated brightness of M_V ~ -11.
Young stars in the arc have metallicity Z > 0.008 and formed around 56 million years ago.
If dispersing, the arc will contribute young, enriched stars to M82's halo.
Abstract
The properties of the brightest resolved stars in an arc that was originally identified by Sun et al. (2005) 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 x 0.8 kpc. The integrated brightness is M_V ~ -11, while the total stellar mass is between 3 x 10^5 and 2 x 10^6 solar masses. If there is only foreground extinction then the youngest stars have a metallicity Z > 0.008 and an age log(tyears) ~ 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 is dispersing then it will deposit young, chemically enriched stars into the M82 halo.
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