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28 March 2024
 
  » arxiv » astro-ph/0407507

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Two New X-ray/Optical/Radio Supernova Remnants in M31
B. F. Williams ; L. O. Sjouwerman ; A. K. H. Kong ; J. D. Gelfand ; M. R. Garcia ; S. S. Murray ;
Date 23 Jul 2004
Journal Astrophys.J. 615 (2004) 720-726
Subject astro-ph
AbstractWe compare a deep (37 ks) Chandra ACIS-S image of the M31 bulge to Local Group Survey narrow-band optical data and Very Large Array (VLA) radio data of the same region. Our precisely registered images reveal two new optical shells with X-ray counterparts. These shells have sizes, [S II]/H-alpha flux ratios, and X-ray spectral properties typical of supernova remnants (SNRs) with ages of 9$^{+3}_{-4}$ and 17$^{+6}_{-9}$ kyr. Analysis of complementary VLA data reveals the radio counterparts, further confirming that they are SNRs. We discuss and compare the properties and morphologies of these SNRs at the different wavelengths.
Source arXiv, astro-ph/0407507
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