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Title: LOCALIZED SiO EMISSION TRIGGERED BY THE PASSAGE OF THE W51C SUPERNOVA REMNANT SHOCK

The region toward W51C is a convincing example of interaction between a supernova remnant (SNR) and a surrounding molecular cloud. Large electron abundances have been reported toward the position W51C-E located in this interaction region, and it was proposed that the enhanced ionization fraction was due to cosmic ray particles freshly accelerated by the SNR shock. We present Plateau de Bure Interferometer observations of the H{sup 13}CO{sup +}(1-0) and DCO{sup +}(2-1) emission lines centered at position W51C-E. These observations confirm the previous scenario of cosmic-ray-induced ionization at this location. In addition, SiO(2-1) emission has been successfully mapped in the close vicinity of W51C-E, with a spatial resolution of 7''. The morphology and kinematics of the SiO emission are analyzed and strongly suggest that this emission is produced by the passage of the SNR primary shock. Put in conjunction with the enhanced ionization fraction in this region, we give a consistent picture in which the W51C-E position is located downstream of the shock, where a large reservoir of freshly accelerated particles is available.
Authors:
 [1] ; ; ; ;  [2] ;  [3] ;  [4]
  1. Institut de Radioastronomie Millimétrique, 300 Rue de la Piscine, F-38406 Saint Martin d'Hères (France)
  2. UJF-Grenoble 1/CNRS-INSU, Institut de Planétologie et d" Astrophysique de Grenoble (IPAG) UMR 5274, F-38041 Grenoble (France)
  3. UPMC-CNRS, UMR 7095, Institute d'Astrophysique de Paris, 98 bis boulevard Arago, F-75014 Paris (France)
  4. APC, AstroParticule et Cosmologie, Université Paris Diderot, CNRS, CEA, Observatoire de Paris, Sorbonne Paris, F-75205 Paris (France)
Publication Date:
OSTI Identifier:
22365858
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 786; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMIC RADIATION; ELECTRONS; EMISSION; HYDROGEN 1; INTERFEROMETERS; IONIZATION; MOLECULES; MORPHOLOGY; SILICON OXIDES; SPATIAL RESOLUTION; SUPERNOVA REMNANTS