About the nature of Mercer14

Details About the nature of Mercer14 About the nature of Mercer14

2011-08-12

arxiv.org/abs/1108.2601v2

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

10pages, 2tables, 5figures, accepted for publication by MNRAS, a version with higher resolution figures can be found at http

Scientific paper

We used UKIRT near infrared (NIR) broad band JHK photometry, narrow band imaging of the 1-0S(1) molecular hydrogen emission line and mid infrared Spitzer IRAC data to investigate the nature of the young cluster Mercer14. Foreground star counts in decontaminated NIR photometry and a comparison with the Besancon Galaxy Model are performed to estimate the cluster distance. This method yields a distance of 2.5kpc with an uncertainty of about 10% and can be applied to other young and embedded clusters. Mercer14 shows clear signs of ongoing star formation with several detected molecular hydrogen outflows, a high fraction of infrared excess sources and an association to a small gas and dust cloud. Hence, the cluster is less than 4Myrs old and has a line of sight extinction of A_K=0.8mag. Based on the most massive cluster members we find that Mercer14 is an intermediate mass cluster with about 500Mo.

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