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Wiley, Monthly Notice- Royal Astronomical Society -Letters-, 1(457), p. L5-L9, 2015

DOI: 10.1093/mnrasl/slv194

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EXTraS discovery of an 1.2-s X-ray pulsar in M 31

Journal article published in 2015 by P. Esposito, G. L. Israel, A. Belfiore, G. Novara, L. Sidoli, G. A. Rodríguez Castillo ORCID, A. De Luca, A. Tiengo, F. Haberl ORCID, R. Salvaterra, Andrew M. Read, D. Salvetti, S. Sandrelli, M. Marelli, J. Wilms and other authors.
This paper is available in a repository.
This paper is available in a repository.

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Abstract

During a search for coherent signals in the X-ray archival data of XMM–Newton, we discovered a modulation at 1.2 s in 3XMM J004301.4+413017 (3X J0043), a source lying in the direction of an external arm of M 31. This short period indicates a neutron star (NS). Between 2000 and 2013, the position of 3X J0043 was imaged by public XMM–Newton observations 35 times. The analysis of these data allowed us to detect an orbital modulation at 1.27 d and study the long-term properties of the source. The emission of the pulsar was rather hard (most spectra are described by a power law with Γ