Journal Article

Optical and X-ray observations of candidate isolated neutron stars in the G315.4-2.3 supernova remnant<sup>⋆</sup>

R. P. Mignani, A. Tiengo and A. de Luca

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 425, issue 3, pages 2309-2312
Published in print September 2012 | ISSN: 0035-8711
Published online September 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21610.x
Optical and X-ray observations of candidate isolated neutron stars in the G315.4-2.3 supernova remnant⋆

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Abstract

G315.4−2.3 is a young Galactic supernova remnant (SNR) whose identification as the remains of a Type II supernova (SN) explosion has been debated for a long time. In particular, recent multiwavelength observations suggest that it is the result of a Type Ia SN, based on spectroscopy of the SNR shell and the lack of a compact stellar remnant. However, two X-ray sources, one detected by Einstein and ROSAT (Source V) and the other by Chandra (Source N), have been proposed as possible isolated neutron star candidates. In both cases, no clear optical identification was available and, therefore, we performed an optical and X-ray study to determine the nature of these two sources. Based on Chandra astrometry, Source V is associated with a bright V ∼ 14 star, which has been suggested based on the less accurate ROSAT position. Similarly, from Very Large Telescope archival observations, we found that Source N is associated with a relatively bright star (V = 20.14). These likely identifications suggest that both X-ray sources cannot be isolated neutron stars.

Keywords: stars: neutron

Journal Article.  3183 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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