Two New X-ray/Optical/Radio Supernova Remnants in M31

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${}_{-4}^{+3}$ and 17${}_{-9}^{+6}$ 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.

arXiv comment18 pages, 5 figures, accepted for publication in ApJ

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• XMM-Newton survey of M 31
• Supernova remnants and candidates detected in the XMM-Newton M31 large survey
• A SITELLE view of M31's central region - I: Calibrations and radial velocity catalogue of nearly 800 emission-line point-like sources
• A Close Look at the Population of Supersoft and Quasi-Soft X-Ray Sources Observed in M31 with XMM-Newton
• XMM-Newton observations of the M31 northern disk: Properties of selected X-ray sources and diffuse emission
• Optical supernova remnants in nearby galaxies and their influence on star formation rates derived from H$\alpha$ emission
• Comparing Chandra and Hubble in the Northern Disk of M31
• The Remnants of Intergalactic Supernovae
• Deep XMM-Newton observations of the northern disc of M31. I. Source catalogue