ASCA discovery of a Be X-ray pulsar in the SMC: AX J0051-733

被引：20

作者：

Imanishi, K ^{[1
]}

Yokogawa, J ^{[1
]}

Tsujimoto, M ^{[1
]}

Koyama, K ^{[1
]}

机构：

[1] Kyoto Univ, Dept Phys, Grad Sch Sci, Sakyo Ku, Kyoto 6068502, Japan

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN | 1999年 / 51卷 / 06期

关键词：

binaries : general; pulsars : individual (AX J0051-733); X-rays : general;

D O I：

10.1093/pasj/51.6.L15

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

ASCA observed the central region of the Small Magellanic Cloud, and found a hard X-ray source, AX J0051-733, at the position of the ROSAT source RX J0058.8-7316, which has an optical counterpart of a Be star. Coherent X-ray pulsations of 323.1 +/- 0.3 s were discovered from AX J0051-733. The pulse profile shows several sub-peaks in the soft (0.7-2.0 keV) X-Pay band, but becomes nearly sinusoidal in the harder (2.0-7.0 keV) X-ray band. The X-ray spectrum was found to be hard, and is well fitted by a power-law model with a photon index of 1.0 +/- 0.4. The long-term flux history was examined with the archival data of Einstein observatory and ROSAT; a flux variability with a factor greater than or similar to 10 was found.

引用

页码：L15 / L19

页数：5

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