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Title:
Hard X-Ray Emission from the W3 Core
Authors:
Hofner, Peter; Churchwell, Ed
Publication:
Astrophysical Journal Letters v.486, p.L39 (ApJL Homepage)
Publication Date:
09/1997
Origin:
APJ
ApJ Keywords:
ISM: H II REGIONS, STARS: FORMATION, X-RAYS: ISM, X-RAYS: STARS
DOI:
10.1086/310825
Bibliographic Code:
1997ApJ...486L..39H

Abstract

We report broadband imaging and spectral observations in the energy range 0.8--12 keV with ASCA toward the H II region complex W3. We find a hard X-ray source, with substantial emission at energies greater than 4 keV, coincident with the W3 core region. The SIS images show that the emission in the W3 core is extended in the east-west direction, similar to the distribution of the compact H II regions. Fitting an optically thin, thermal plasma model to the X-ray spectra from the W3 core region, we find a temperature of 7 x 107 K, an absorbing hydrogen column of 2.1 x 1022 cm-2, and a luminosity of ~1033 ergs s-1 in the 2--10 keV band. Weak line emission from the He-like ion of Fe XXV at 6.7 keV is also detected. If the X-ray emission is typical of Galactic compact H II regions, then they cannot be the primary source of the Fe XXV emission from the Galactic disk.
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