SIGMA-OBSERVATION OF THE PULSAR OAO-1657-415 - PRECISE LOCALIZATION AT HARD X-RAY-ENERGY AND DISCOVERY OF SPIN-DOWN

被引：13

作者：

MEREGHETTI, S

BALLET, J

LAMBERT, A

MANDROU, P

NATALUCCI, L

PAUL, J

ROQUES, JP

SALOTTI, L

GILFANOV, M

SUNYAEV, R

BABALYAN, G

CHURAZOV, E

KHAVENSON, N

KUZNETSOV, A

STEPANOV, D

YUNIN, S

机构：

[1] CENS,CEA,SERV ASTROPHYS,F-91191 GIF SUR YVETTE,FRANCE

[2] MOSCOW SPACE RES INST,MOSCOW 117296,USSR

来源：

ASTROPHYSICAL JOURNAL | 1991年 / 366卷 / 01期

关键词：

D O I：

10.1086/185901

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The region of sky containing the 38 s X-ray pulsar OAO 1657-415 has been observed on 1990 March with Sigma, an imaging gamma-ray telescope exploiting the coded mask technique. This observation has yielded an accurate (∼arcminute-scale) localization for OAO 1657-415 at hard X-ray energy, confirming its association with a previously suggested soft X-ray candidate. A timing analysis of the 40-120 keV data has revealed for the first time a spin-down episode in OAO 1657-415, implying that an important change in the accretion torque experienced by this X-ray pulsar must have recently occurred.

引用

页码：L23 / L25

页数：3

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