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http://hdl.handle.net/20.500.12386/28732
Title: | Discovery of a 0.42-s pulsar in the ultraluminous X-ray source NGC 7793 P13 | Authors: | ISRAEL, Gian Luca PAPITTO, ALESSANDRO Esposito, P. STELLA, Luigi ZAMPIERI, Luca Belfiore, A. RODRIGUEZ CASTILLO, Guillermo Andres DE LUCA, Andrea Tiengo, A. Haberl, F. Greiner, J. SALVATERRA, Ruben SANDRELLI, Stefano Lisini, G. |
Issue Date: | 2017 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 466 | Issue: | 1 | First Page: | L48 | Abstract: | NGC 7793 P13 is a variable (luminosity range ∼100) ultraluminous X-ray source proposed to host a stellar-mass black hole of less than 15 M<SUB>☉</SUB> in a binary system with orbital period of 64 d and a 18-23 M<SUB>☉</SUB> B9Ia companion. Within the EXTraS (Exploring the X-ray Transient and variable Sky) project, we discovered pulsations at a period of ∼0.42 s in two XMM-Newton observations of NGC 7793 P13, during which the source was detected at L<SUB>X</SUB> ∼ 2.1 × 10<SUP>39</SUP> and 5 × 10<SUP>39</SUP> erg s<SUP>-1</SUP> (0.3-10 keV band). These findings unambiguously demonstrate that the compact object in NGC 7793 P13 is a neutron star accreting at super-Eddington rates. While standard accretion models face difficulties accounting for the pulsar X-ray luminosity, the presence of a multipolar magnetic field with B ∼ few × 10<SUP>13</SUP> G close to the base of the accretion column appears to be in agreement with the properties of the system. | URI: | http://hdl.handle.net/20.500.12386/28732 | URL: | https://academic.oup.com/mnrasl/article/466/1/L48/2417274 | ISSN: | 0035-8711 | DOI: | 10.1093/mnrasl/slw218 | Bibcode ADS: | 2017MNRAS.466L..48I | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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