Swift and Chandra confirm the intensity-hardness correlation of the AXP 1RXS J170849.0-400910

被引：33

作者：

Campana, S.

Rea, N.

Israel, G. L.

Turolla, R.

Zane, S.

机构：

[1] INAF, Osservatorio Astron Brera, I-23807 Merate, Lc, Italy

[2] SRON, Netherlands Inst Space Res, NL-3584 CA Utrecht, Netherlands

[3] Osserv Astron Roma, INAF, I-00040 Monte Catone, Rome, Italy

[4] Univ Padua, Dept Phys, I-35131 Padua, Italy

[5] UCL, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England

来源：

ASTRONOMY & ASTROPHYSICS | 2007年 / 463卷 / 03期

关键词：

star : individual : 1RXS J170849.0-400910; stars : neutron; X-rays : stars;

D O I：

10.1051/0004-6361:20065482

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Convincing evidence of long-term variations in the emission properties of the anomalous X-ray pulsar 1RXS J170849.0-400910 has been gathered in the past few years. In particular, and following the pulsar glitches of 1999 and 2001, XMM-Newton witnessed a decline in 2003 of the X-ray flux accompanied by a definite spectral softening. This suggested the existence of a correlation between the luminosity and the spectral hardness in this source, similar to what was seen in the soft gamma-repeater SGR 1806-20. Here we report on new Chandra and Swift observations of 1RXS J170849.0-400910 performed in 2004 and 2005, respectively. These observations confirm and strengthen the proposed correlation. The trend appears to have now reversed: the flux has increased and the spectrum is now harder. We briefly discuss the consequences of these observations for the twisted magnetosphere scenario for anomalous X-ray pulsars.

引用

页码：1047 / 1051

页数：5

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