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http://hdl.handle.net/20.500.12386/24301
Title: | EXTraS discovery of an 1.2-s X-ray pulsar in M 31 | Authors: | Esposito, P. ISRAEL, Gian Luca Belfiore, A. Novara, G. SIDOLI, Lara RODRIGUEZ CASTILLO, Guillermo Andres DE LUCA, Andrea Tiengo, A. Haberl, F. SALVATERRA, Ruben Read, A. M. Salvetti, D. SANDRELLI, Stefano MARELLI, MARTINO Wilms, J. D'Agostino, D. |
Issue Date: | 2016 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. LETTERS | Number: | 457 | Issue: | 1 | First Page: | L5 | 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 < 1) and, assuming the distance to M 31, the 0.3-10 keV luminosity was variable, from ̃3 × 10<SUP>37</SUP> to 2 × 10<SUP>38</SUP> erg s<SUP>-1</SUP>. The analysis of optical data shows that, while 3X J0043 is likely associated to a globular cluster in M 31, a counterpart with V ≳ 22 outside the cluster cannot be excluded. Considering our findings, there are two main viable scenarios for 3X J0043: a peculiar low-mass X-ray binary, similar to 4U 1822-37 or 4U 1626-67, or an intermediate-mass X-ray binary resembling Her X-1. Regardless of the exact nature of the system, 3X J0043 is the first accreting NS in M 31 in which the spin period has been detected.... | URI: | http://hdl.handle.net/20.500.12386/24301 | URL: | https://academic.oup.com/mnrasl/article/457/1/L5/2589570 https://arxiv.org/abs/1512.00467 |
ISSN: | 1745-3925 | DOI: | 10.1093/mnrasl/slv194 | Bibcode ADS: | 2016MNRAS.457L...5E | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
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1512.00467.pdf | preprint | 1.44 MB | Adobe PDF | View/Open |
slv194.pdf | pdf editoriale | 10.79 MB | Adobe PDF | View/Open |
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