SIMBAD references

2002AJ....123.1629K - Astron. J., 123, 1629-1638 (2002/March-0)

An ASCA study of the W51 complex.

KOO B.-C., LEE J.-J. and SEWARD F.D.

Abstract (from CDS):

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 that 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.

Abstract Copyright:

Journal keyword(s): ISM: H II Regions - ISM: Individual: Alphanumeric: W51 - Stars: Formation - ISM: Supernova Remnants - X-rays: ISM

Nomenclature: Table 1, Fig.2: [KLS2002] HX-N (Nos 1-3), [KLS2002] HX3-east, [KLS2002] HX3-west. Fig.2: [KLS2002] XW (Nos XN, XW, XS).

Simbad objects: 15

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