A NuSTAR OBSERVATION OF THE GAMMA-RAY-EMITTING X-RAY BINARY AND TRANSITIONAL MILLISECOND PULSAR CANDIDATE 1RXS J154439.4-112820

被引：13

作者：

Bogdanov, Slavko ^{[1
]}

机构：

[1] Columbia Univ, Columbia Astrophys Lab, 550 West 120th St, New York, NY 10027 USA

来源：

ASTROPHYSICAL JOURNAL | 2016年 / 826卷 / 01期

关键词：

pulsars: general; stars: neutron; X-rays: binaries; SUB-LUMINOUS ACCRETION; PSR J1023+0038; STATE CHANGE; TRANSIENT; ROTATION; SYSTEM; DISK; PULSATIONS; M28;

D O I：

10.3847/0004-637X/826/1/28

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

I present a 40 ks Nuclear Spectroscopic Telescope Array observation of the recently identified low-luminosity X-ray binary and transitional millisecond pulsar (tMSP) candidate 1RXS J154439.4-112820, which is associated with the high-energy gamma-ray source 3FGL J1544.6-1125. The system is detected up to similar to 30 keV with an extension of the same power-law spectrum and rapid large-amplitude variability between two flux levels observed in soft X-rays. These findings provide further evidence that 1RXS J154439.4-112820 belongs to the same class of objects as the nearby bona fide tMSPs PSR J1023+0038 and XSS J12270-4859 and therefore almost certainly hosts a millisecond pulsar accreting at low luminosity. I also examine the long-term accretion history of 1RXS J154439.4-112820 based on archival optical, ultraviolet, X-ray, and gamma-ray light curves covering approximately the past decade. Throughout this period, the source has maintained similar flux levels at all wavelengths, which is an indication that it has not experienced prolonged episodes of a non-accreting radio pulsar state but may spontaneously undergo such events in the future.

引用

页数：7

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