AX J1910.7+0917: the slowest X-ray pulsar

被引：19

作者：

Sidoli, L. ^{[1
]}

Israel, G. L. ^{[2
]}

Esposito, P. ^{[3
]}

Castillo, G. A. Rodriguez ^{[2
]}

Postnov, K. ^{[4
,5
]}

机构：

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

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

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

[4] Moscow Lomonosov State Univ, Fac Phys, Leninskie Gory 1-2, Moscow 119991, Russia

[5] Moscow Lomonosov State Univ, Sternberg Astron Inst, 13 Univ Skij Pr, Moscow 119234, Russia

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2017年 / 469卷 / 03期

基金：

俄罗斯科学基金会;

关键词：

stars: neutron; pulsars: general; X-rays: binaries; X-rays: individual: AX J1910.7+0917; CXOU J191043.7+091629; 2XMM J191043.4+091629; PHOTON IMAGING CAMERA; GALACTIC PLANE SURVEY; SUPERNOVA REMNANT; XMM-NEWTON; EMISSION; BINARIES; PERIOD; TRANSIENTS; CATALOG;

D O I：

10.1093/mnras/stx1105

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Pulsations from the high-mass X-ray binary AX J1910.7+0917 were discovered during Chandra observations performed in 2011. We report here more details on this discovery and discuss the source nature. The period of the X-ray signal is P = 36200 +/- 110 s, with a pulsed fraction, PF, of 63 +/- 4 per cent. Given the association with a massive B-type companion star, we ascribe this long periodicity to the rotation of the neutron star (NS), making AX J1910.7+0917 the slowest known X-ray pulsar. We also report on the spectroscopy of XMM-Newton observations that serendipitously covered the source field, resulting in a highly absorbed (column density almost reaching 10(23) cm(-2)), power-law X-ray spectrum. The X-ray flux is variable on a time-scale of years, spanning a dynamic range greater than or similar to 60. The very long NS spin period can be explained within a quasi-spherical settling accretion model that applies to low luminosity, wind-fed, X-ray pulsars.

引用

页码：3056 / 3061

页数：6

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