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New Supernova Remnants in M33

Published online by Cambridge University Press:  12 April 2016

Knox S. Long ,
William P. Blair ,
Robert P. Kirshner  and
P. Frank Winkler Jr.
Knox S. Long
Affiliation:
The Johns Hopkins University, Baltimore, Md., U.S.A
William P. Blair
Affiliation:
The Johns Hopkins University, Baltimore, Md., U.S.A
Robert P. Kirshner
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, Ma., U.S.A
P. Frank Winkler Jr.
Affiliation:
Middlebury College, Middlebury, Vt., U.S.A

Abstract

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Existing catalogues of supernova remnants (SNRs) in external galaxies are very incomplete. Potentially however, such samples are of great importance in understanding SNRs, since the distances to objects in a given sample are essentially the same and since absorption is small (compared to galactic SNRs). We have recently obtained Hα+[NII], Hβ, [SII], [OIII], and 6100 Å continuum CCD images of nine selected areas in M33 using the KPNO 4m. In addition to the six SNRs already known to exist in the fields we have surveyed, we have identified 21 other nebulae with [SII]:Hα+[NII] ratios which may be SNRs. Spectra of seven of these nebulae were obtained subsequently and show that the majority are indeed SNRs. A more detailed analysis of regions containing significant HII region contamination and a search for very small diameter remnants is currently underway.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 101: Supernova Remnants and the Interstellar Medium , 1988 , pp. 197 - 200
Copyright
Copyright © Cambridge University Press 1988

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