EXTraS discovery of an 1.2-s X-ray pulsar in M 31
| Autor: | G. Novara, G. L. Israel, G. A. Rodríguez Castillo, D. Salvetti, Ruben Salvaterra, Jörn Wilms, S. Sandrelli, Frank Haberl, Andrea Tiengo, A. De Luca, Daniele D'Agostino, Lara Sidoli, A. M. Read, M. Marelli, Andrea Belfiore, Paolo Esposito |
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| Přispěvatelé: | ITA, GBR, DEU |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Physics
High Energy Astrophysical Phenomena (astro-ph.HE) Astrophysics::High Energy Astrophysical Phenomena galaxies: individual: M 31 X-rays: binaries X-rays: individual: 3XMM J004301.4+413017 Astronomy FOS: Physical sciences Astronomy and Astrophysics Astrophysics 01 natural sciences Power law Spectral line Luminosity Neutron star Pulsar Space and Planetary Science Globular cluster 0103 physical sciences 010306 general physics Astrophysics - High Energy Astrophysical Phenomena 010303 astronomy & astrophysics X-ray pulsar Spin-½ |
| Zdroj: | Monthly notices of the Royal Astronomical Society. Letters 457 (2016): L5–L9. doi:10.1093/mnrasl/slv194 info:cnr-pdr/source/autori:P. Esposito, G. L. Israel, A. Belfiore, G. Novara, L. Sidoli, G. A. Rodríguez Castillo, A. De Luca, A. Tiengo, F. Haberl, R. Salvaterra, A. M. Read, D. Salvetti, S. Sandrelli, M. Marelli, J. Wilms, and D. D'Agostino/titolo:EXTraS discovery of an 1.2-s X-ray pulsar in M 31/doi:10.1093%2Fmnrasl%2Fslv194/rivista:Monthly notices of the Royal Astronomical Society. Letters/anno:2016/pagina_da:L5/pagina_a:L9/intervallo_pagine:L5–L9/volume:457 |
| DOI: | 10.1093/mnrasl/slv194 |
| Popis: | 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 $\Gamma < 1$) and, assuming the distance to M 31, the 0.3-10 keV luminosity was variable, from $\sim$$3\times10^{37}$ to $2\times10^{38}$ erg s$^{-1}$. The analysis of optical data shows that, while 3X J0043 is likely associated to a globular cluster in M 31, a counterpart with $V\gtrsim22$ 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. Comment: To appear in MNRAS Letters; 2 color figures, 2 tables; 5 pages plus full Table 1 (1 page) |
| Databáze: | OpenAIRE |
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