Discovery of a 0.42-s pulsar in the ultraluminous X-ray source NGC 7793 P13

被引：275

作者：

Israel, G. L. ^{[1
]}

Papitto, A. ^{[1
]}

Esposito, P. ^{[2
,3
]}

Stella, L. ^{[1
]}

Zampieri, L. ^{[4
]}

Belfiore, A. ^{[3
]}

Castillo, G. A. Rodriguez ^{[1
]}

De Luca, A. ^{[3
]}

Tiengo, A. ^{[3
,5
,6
]}

Haberl, F. ^{[7
]}

Greiner, J. ^{[7
]}

Salvaterra, R. ^{[3
]}

Sandrelli, S. ^{[8
]}

Lisini, G. ^{[5
]}

机构：

[1] Osserv Astron Roma, INAF, Via Frascati 33, I-00040 Monte Porzio Catone, Italy

[2] Univ Amsterdam, Anton Pannekoek Inst Astron, Postbus 94249, NL-1090 GE Amsterdam, Netherlands

[3] Ist Astrofis Spaziale & Fis Cosm Milano, INAF, Via E Bassini 15, I-20133 Milan, Italy

[4] Osserv Astron Padova, INAF, Vicolo Osservatorio 5, I-35122 Padua, Italy

[5] Scuola Univ Super IUSS Pavia, Piazza Vittoria 15, I-35122 Pavia, Italy

[6] Ist Nazl Fis Nucl, Sez Pavia, Via A Bassi 6, I-27100 Pavia, Italy

[7] Max Planck Inst Extraterr Phys, Giessenbachstr, D-85748 Garching, Germany

[8] Osserv Astron Brera, INAF, Via Brera 28, I-20121 Milan, Italy

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2017年 / 466卷 / 01期

关键词：

galaxies: individual: NGC 7793; X-rays: binaries : X-rays: individual:CXOU J235750.9-323726 (XMMU J235751.1-323725; NGC 7793 P13); MAGNETIZED NEUTRON-STARS; BLACK-HOLE; ACCRETION; ABSORPTION; GALAXIES; SCULPTOR; MASS;

D O I：

10.1093/mnrasl/slw218

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

NGC 7793 P13 is a variable (luminosity range similar to 100) ultraluminous X-ray source proposed to host a stellar-mass black hole of less than 15M circle dot in a binary system with orbital period of 64 d and a 18-23 M-circle dot B9Ia companion. Within the EXTraS ( Exploring the X-ray Transient and variable Sky) project, we discovered pulsations at a period of similar to 0.42 s in two XMM-Newton observations of NGC 7793 P13, during which the source was detected at LX similar to 2.1 x 1039 and 5 x 1039 erg s(-1) (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 similar to few x 10(13) G close to the base of the accretion column appears to be in agreement with the properties of the system.

引用

页码：L48 / L52

页数：5

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