ACIS-I Reveals a 60 Mega Kelvin Cocoon Surrounding a Galactic Star Burst Monster

Details ACIS-I Reveals a 60 Mega Kelvin Cocoon Surrounding a Galactic Star Burst Monster ACIS-I Reveals a 60 Mega Kelvin Cocoon Surrounding a Galactic Star Burst Monster

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cxo..prop.1806t&link_type=abstract

Chandra Proposal ID #06910723

Physics

Chandra Proposal Id #06910723

Scientific paper

We propose an ACIS-I imaging-spectroscopy observation of W49A, one of the most luminous and youngest giant HII region in our Galaxy. The aim of this observation is to establish the hard X-ray diffuse emission from giant HII regions and to discuss the cause and affect of the enigmatic phenomenon. A part of W49A was coincidently covered by ACIS-S at its edge, indicating the existence of T~60 MK plasma in W49A. Our observation will identify the diffuse nature of this emission and determine the morphology and plasma parameters with an improved PSF radius. The contribution of diffuse emission from HII regions to the Galactic diffuse X-ray emission is going to be discussed based on this data.

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