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arXiv · 1206.4789

Supernova remnants and candidates detected in the XMM-Newton M31 large survey

Manami Sasaki·Wolfgang Pietsch·Frank Haberl·Despina Hatzidimitriou·Holger Stiele·Benjamin Williams·Albert Kong·Ulrich Kolb
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Abstract

We present the analysis of supernova remnants (SNRs) and candidates in M31 identified in the XMM-Newton large programme survey of M31. SNRs are among the bright X-ray sources in a galaxy. They are good indicators of recent star formation activities of a galaxy and of the interstellar environment in which they evolve. By combining the X-ray data of sources in M31 with optical data as well as with optical and radio catalogues, we aim to compile a complete, revised list of SNRs emitting X-rays in M31 detected with XMM-Newton, study their luminosity and spatial distribution, and understand the X-ray spectrum of the brightest SNRs. We analysed the X-ray spectra of the twelve brightest SNRs and candidates using XMM-Newton data. The four brightest sources allowed us to perform a more detailed spectral analysis and the comparison of different models to describe their spectrum. For all M31 large programme sources we searched for optical counterparts on the Ha, [Sii], and [Oiii] images of the Local Group Galaxy Survey. We confirm 21 X-ray sources as counterparts of known SNRs. In addition, we identify five new X-ray sources as X-ray and optically emitting SNRs. Seventeen sources are no longer considered as SNR candidates. We have thus created a list of 26 X-ray SNRs and 20 candidates in M31 based on their X-ray, optical, and radio emission, which is the most recent complete list of X-ray SNRs in M31. The brightest SNRs have X-ray luminosities of up to 8 x 10^36 erg/s in the 0.35 - 2.0 keV band.

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Manami Sasaki, Wolfgang Pietsch, Frank Haberl, Despina Hatzidimitriou, Holger Stiele, Benjamin Williams, Albert Kong, Ulrich Kolb. 2012-06-21. Supernova remnants and candidates detected in the XMM-Newton M31 large survey. https://doi.org/10.1051/0004-6361%2F201219025

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