INTEGRAL and XMM-Newton observations of LSI+61° 303

被引：55

作者：

Chernyakova, M.

Neronov, A.

Walter, R.

机构：

[1] INTEGRAL Sci Data Ctr, CH-1290 Chavannes Des Bois, Switzerland

[2] Observ Geneva, CH-1290 Chavannes Des Bois, Switzerland

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2006年 / 372卷 / 04期

关键词：

pulsars : individual : LSI+61 degrees 303; X-rays : binaries; X-rays : individual : LSI+61 degrees 303;

D O I：

10.1111/j.1365-2966.2006.10946.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

LSI +61 degrees 303 is one of the few X-ray binaries with Be star companion from which both radio and high-energy gamma-ray emission have been observed. We present XMM-Newton and INTEGRAL observations which reveal variability of the X-ray spectral index of the system. The X-ray spectrum is hard (photon index Gamma similar or equal to 1.5) during the orbital phases of both high and low X-ray flux. However, the spectrum softens at the moment of transition from high to low X-ray state. The spectrum of the system in the hard X-ray band does not reveal the presence of a cut-off (or, at least a spectral break) at 10-60 keV energies, expected if the compact object is an accreting neutron star. The observed spectrum and spectral variability can be explained if the compact object in the system is a rotation-powered pulsar.

引用

页码：1585 / 1592

页数：8

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