An ASCA Study of the W51 Complex

Details An ASCA Study of the W51 Complex An ASCA Study of the W51 Complex

2001-12-15

arxiv.org/abs/astro-ph/0112367v1

Astronomy and Astrophysics

Astrophysics

13 pages, 11 figures, to be published in Astronomical Journal

Scientific paper

10.1086/339179

We present the analysis of ASCA archival data from the Galactic source W51. The ASCA spectra show that the soft (kT<= 2.5 keV) X-rays are of thermal origin and are compatible with W51C being a single, isothermal (kT~0.3 keV) supernova remnant at the far-side of the Sagittarius arm. The ASCA images reveal hard (kT>=2.5 keV) X-ray sources which were not seen in previous X-ray observations. Some of these sources are coincident with massive star-forming regions and the spectra are used to derive X-ray parameters. By comparing the X-ray absorbing column density with atomic hydrogen column density, we infer the location of star-forming regions relative to molecular clouds. There are unidentified hard X-ray sources superposed on the supernova remnant and we discuss the possibility of their association.

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