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Bibliographic Details
Main Authors:	Lazarević, S., Brose, R., Oskinova, L. M., Chernyakova, M., Dai, S., Kargaltsev, O., Freund, S., Maitra, C., Filipović, M. D., Edwards, P. G., Mellah, I. El, Guo, Z., Osses, J., van Soelen, B., Potter, S. B., Kothes, R., Rowell, G. P., Velović, V., Ahmad, A., Ball, B. D., Burger-Scheidlin, C., Galvin, T. J., Gordon, Y. A., Hopkins, A. M., Leahy, D., Pritchard, J., West, J.
Format:	Preprint
Published:	2026
Subjects:	High Energy Astrophysical Phenomena
Online Access:	https://arxiv.org/abs/2604.16882
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In a search for low surface brightness radio nebulae using the ASKAP-EMU survey, we discovered a faint radio shell, G289.6+5.8, and its central point radio source at the position of the soft gamma-ray source IGR J11187-5438. The central radio source is spatially coincident with a previously known low-mass X-ray binary (LMXB) with an M-type donor star. However, the newly determined Gaia DR3 distance of 267 pc and correspondingly low X-ray luminosity (3 x 10e31 erg/s) cast doubt on the LMXB classification. Neither radio nor X-ray pulsations are detected. Chance-alignments between radio shell, central radio source, optical star, gamma-ray, and X-ray sources appear unlikely. By combining all currently available evidence, we conclude that G289.6+5.8 is a remnant of a low-energy core-collapse explosion of an intermediate mass star (~8Msun) in a binary system with an M-type secondary, which remained bound after the explosion. In this scenario, G289.6+5.8 is a supernova remnant, while the central gamma- and X-ray source is associated with a young neutron star driving a pulsar wind interacting with its M-type stellar companion, making IGR J11187-5438 a nascent spider-type X-ray binary.

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