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
Abstract
We 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.
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