Uncharted Territory in M17: In Search of an Older Generation of Young Stars

Details Uncharted Territory in M17: In Search of an Older Generation of Young Stars Uncharted Territory in M17: In Search of an Older Generation of Young Stars

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cxo..prop.2766p&link_type=abstract

Chandra proposal ID #11200254

Physics

Scientific paper

We request a 40-ks ACIS-I pointing northeast of the giant H II region M17. M17 exhibits a unique, bright outflow of hot, wind-shocked plasma. It is located on the rim of a 20-pc diameter wind-blown bubble. This suggests that the young (~1 Myr old) massive NGC 6618 cluster ionizing M17 may have been triggered. We will search for the "trigger," a massive cluster called NGC 6618PG. While NGC 6618PG contains 7 OB stars, it lacks >1 Msun stars with disks, suggesting an age >2 Myr. It is impossible to separate cluster members from field stars using IR imaging alone. We require high-resolution X-ray imaging to address the following questions: Does the cluster exist? Does O star X-ray emission change significantly in a few Myr? What confines the hot plasma from M17 at its northern boundary?

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