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Title:
H I voids around filled-center supernova remnants
Authors:
Wallace, B. J.; Landecker, T. L.; Taylor, A. R.
Affiliation:
AA(The University of Calgary, Calgary, Canada), AB(The University of Calgary, Calgary, Canada), AC(The University of Calgary, Calgary, Canada)
Publication:
Astronomy and Astrophysics (ISSN 0004-6361), vol. 286, no. 2, p. 565-578 (A&A Homepage)
Publication Date:
06/1994
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
ABSORPTION SPECTRA, CRAB NEBULA, H I REGIONS, INTERSTELLAR MATTER, LINE SPECTRA, RADIO ASTRONOMY, RADIO SPECTRA, SUPERNOVA REMNANTS, DECIMETER WAVES, INFRARED RADIATION, ULTRAHIGH FREQUENCIES
Bibliographic Code:
1994A&A...286..565W

Abstract

Low resolution observations in the 21 cm line of neutral atomic hydrogen (HI) have been made of 8.5 deg x 8.5 deg regions centered on four supernova remnants having a 'filled-center' radio morphology; the Crab Nebula, 3C58, G74.9+1.2, and G21.5-0.9. Each of these objects is bright enough for HI absorption spectra to have been measured, positioning the objects in velocity-space. Three of the fields have large voids in the HI distribution encompassing the positions and velocities of the remnants, while data for the fourth field are inconclusive. It is suggested that the voids delay formation of synchrotron emitting shells around the central plerions. In addition, we identify an expanding bubble in the HI distribution immediately surrounding an O7 III star in the vicinity of the Crab Nebula.

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