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An atlas of supernova remnant candidates in Messier 31Narrow-band CCD imagery in H-alpha and forbidden SII of a large fraction of the spiral arms in the Northeast half of Messier 31 has been used to isolate a sample of 52 'forbidden-line' SNR candidates for which the integrated ratio forbidden SII:H-alpha is greater than 0.5. An atlas of images in these emission lines, red optical continuum, and 1465 MHz radio continuum is presented, together with the tabulated integral properties of these sources. Assessing the completeness of the sample yields a crude estimate of the massive supernova rate (due to stars more massive than 7 solar masses) of 1 in 80 yr. The range of measured luminosities in both H-alpha and radio continuum is fully consistent with those found for 'forbidden-line' SNR in Messier 33, the LMC, and the Galaxy. With the inclusion of our candidates the number of extragalactic SNRs (with well-known distances) now exceeds the number of known galactic SNRs.
Document ID
19930056179
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Braun, R.
(Netherlands Foundation for Research in Astronomy, Dwingeloo; Kitt Peak National Observatory, Tucson AZ, United States)
Walterbos, R. A. M.
(New Mexico State Univ. Las Cruces; Kitt Peak National Observatory, Tucson, AZ, United States)
Date Acquired
August 16, 2013
Publication Date
April 1, 1993
Publication Information
Publication: Astronomy and Astrophysics Supplement Series
Volume: 98
Issue: 2
ISSN: 0365-0138
Subject Category
Astronomy
Accession Number
93A40176
Funding Number(s)
CONTRACT_GRANT: NAS5-26555
Distribution Limits
Public
Copyright
Other

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