An ASCA Study of the W51 Complex

Abstract

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.

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

References in corpus (2)

• A Bow Shock Nebula Around a Compact X-Ray Source in the Supernova Remnant IC443
• A Pulsar Wind Nebula in the Oxygen-Rich Supernova Remnant G292.0+1.8

Cited by in corpus (18)

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• Morphological and spectral properties of the W51 region measured with the MAGIC telescopes
• Comparing Neutron Star Kicks to Supernova Remnant Asymmetries
• Supernova Remnants Interacting with Molecular Clouds: X-ray and Gamma-ray Signatures
• OH (1720 MHz) Masers: A Multiwavelength Study of the Interaction between the W51C Supernova Remnant and the W51B Star Forming Region
• Astrometry of Galactic Star-Forming Region G48.61+0.02 with VERA
• The Metal-enriched Thermal Composite Supernova Remnant Kesteven 41 (G337.8-0.1) in a Molecular Environment
• Mixed-Morphology Supernova Remnants in X-rays: Isothermal Plasma in HB21 and Probable Oxygen-Rich Ejecta in CTB 1
• Prediction of the diffuse neutrino flux from cosmic ray interactions near Supernova Remnants
• High velocity HI is not associated with TeV supernova remnant W51C
• XMM-Newton observation of the Galactic supernova remnant W51C (G49.1-0.1)
• Towards a new modelling of gas flows in a semi-analytical model of galaxy formation and evolution
• X-Ray Observations of the W51 Complex with Suzaku
• A LOFAR search for steep-spectrum pulsars in Supernova Remnants and Pulsar Wind Nebulae
• On the Nonthermal Emission from the Supernova Remnant W51C
• Suzaku Observations of Fe K-shell Lines in the Supernova Remnant W51C and Hard X-ray Sources in the Proximity