X-RAY OBSERVATIONS OF XSS J12270-4859 IN A NEW LOW STATE: A TRANSFORMATION TO A DISK-FREE ROTATION-POWERED PULSAR BINARY

被引：53

作者：

Bogdanov, Slavko ^{[1
]}

Patruno, Alessandro ^{[2
,3
]}

Archibald, Anne M. ^{[3
]}

Bassa, Cees ^{[3
]}

Hessels, Jason W. T. ^{[3
,4
]}

Janssen, Gemma H. ^{[3
]}

Stappers, Ben W. ^{[5
]}

机构：

[1] Columbia Univ, Columbia Astrophys Lab, New York, NY 10027 USA

[2] Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands

[3] ASTRON, NL-7990 AA Dwingeloo, Netherlands

[4] Univ Amsterdam, Astron Inst Anton Pannekoek, NL-1098 XH Amsterdam, Netherlands

[5] Univ Manchester, Sch Phys & Astron, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England

来源：

ASTROPHYSICAL JOURNAL | 2014年 / 789卷 / 01期

关键词：

pulsars: general; pulsars: individual (XSS J12270-4859); stars: neutron; X-rays: binaries; PHOTON IMAGING CAMERA; MILLISECOND PULSAR; GAMMA-RAY; XMM-NEWTON; EMISSION; CHANDRA; ACCRETION; J102347.6+003841; DISCOVERY; TUCANAE;

D O I：

10.1088/0004-637X/789/1/40

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present XMM-Newton and Chandra observations of the low-mass X-ray binary XSS J12270-4859, which experienced a dramatic decline in optical/ X-ray brightness at the end of 2012, indicative of the disappearance of its accretion disk. In this new state, the system exhibits previously absent orbital-phase-dependent, large-amplitude X-ray modulations with a decline in flux at superior conjunction. The X-ray emission remains predominantly non-thermal but with an order of magnitude lower mean luminosity and significantly harder spectrum relative to the previous high flux state. This phenomenology is identical to the behavior of the radio millisecond pulsar (MSP) binary PSR J1023+0038 in the absence of an accretion disk, where the X-ray emission is produced in an intra-binary shock driven by the pulsar wind. This further demonstrates that XSS J12270-4859 no longer has an accretion disk and has transformed to a full-fledged eclipsing "redback" system that hosts an active rotation-powered MSP. There is no evidence for diffuse X-ray emission associated with the binary that may arise due to outflows or a wind nebula. An extended source situated 1'.5 from XSS J12270-4859 is unlikely to be associated, and is probably a previously uncataloged galaxy cluster.

引用

页数：7

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