XMM-Newton and Canadian Galactic Plane Survey Observations of the Supernova Remnant G107.5-1.5

TL;DR

This study used XMM-Newton to observe the supernova remnant G107.5-1.5, finding no diffuse X-ray emission and identifying several point sources, but no evidence of an associated neutron star.

Contribution

First X-ray observation of G107.5-1.5 with upper limits on diffuse emission and analysis of point sources ruling out neutron star association.

Findings

No diffuse X-ray emission detected from the SNR.

Eight bright point sources identified, unlikely to be neutron star counterparts.

No pulsations found in the analyzed point sources.

Abstract

We present an XMM-Newton observation of the highly polarized low-surface brightness supernova remnant G107.5-1.5, discovered with the Canadian Galactic Plane Survey (CGPS). We do not detect diffuse X-ray emission from the SNR and set an upper limit on the surface brightness of ~2 x 10^30 erg arcmin^-2 s^-1, at an assumed distance of 1.1 kpc. We found eight bright point sources in the field, including the ROSAT source 1RXS J225203.8+574249 near the centre of the radio shell. Spectroscopic analysis of some of the embedded point sources, including the ROSAT source, has been performed, and all eight sources are most likely ruled out as the associated neutron star, primarily due to counterpart bright stars in optical and infrared bands. Timing analysis of the bright point sources yielded no significant evidence for pulsations, but, due to the timing resolution, only a small part of the frequency space could be searched. An additional ten fainter point sources were identified in the vicinity of the SNR. Further X-ray observation of these and the region in the vicinity of the radio shell may be warranted.