Chandra Finds Buried Stellar Treasure in the Clouds of W40

Details Chandra Finds Buried Stellar Treasure in the Clouds of W40 Chandra Finds Buried Stellar Treasure in the Clouds of W40

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe.136k&link_type=abstract

Chandra's First Decade of Discovery, Proceedings of the conference held 22-25 September, 2009 in Boston, MA. Edited by Scott Wo

Physics

Stars And Star Formation

Scientific paper

The heavily obscured cluster illuminating the W40 HII region, one of the nearest massive star forming regions, has been observed with the ACIS detector on board the Chandra X-ray Observatory. Due to its high obscuration this is a poorly studied stellar cluster with only a handful of bright stars identified in the optical band, including three OB stars as primary excitation sources. This neglected region deserves detailed investigation. We detect 225 X-ray sources, of which 85% are confidently identified as young stellar members of the region. Our X-ray luminosity function (XLF) analysis confirms the 600 pc distance to W40. Under the assumption of a coeval population with a uniform obscuration the XLF analysis further gives a total stellar population of at least 400 stars down to 0.1Mo. However, we find spatial patches with different source obscurations and Ks-band-excess disk fractions which might suggest that the true underlying population is higher. The location of the strip with highest obscuration is unusual relative to the location of the central cluster and the cold molecular core. The disk fraction has a large variation across the field. Properties of the interesting sources, including diffuse X-ray emission, OB stars, and the young stellar object with a super-hot flare are also discussed.

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