X-rays from radio millisecond pulsars: Comptonized thermal radiation

被引：17

作者：

Bogdanov, Slavko ^{[1
]}

Grindlay, Jonathan E. ^{[1
]}

Rybicki, George B. ^{[1
]}

机构：

[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

来源：

ASTROPHYSICAL JOURNAL | 2006年 / 648卷 / 01期

基金：

美国国家航空航天局;

关键词：

pulsars : general; pulsars : individual (PSR J0437-4715); stars : neutron; X-rays : stars;

D O I：

10.1086/507827

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

X-ray emission from many rotation-powered millisecond pulsars (MSPs) is observed to be of predominantly thermal nature. In PSR J0437 - 4715, the nearest MSP known, an additional faint power-law tail is observed above 2.5 keV, commonly attributed to nonthermal magnetospheric radiation. We propose that the hard emission in this and other similar MSPs is instead due to weak Comptonization of the thermal (blackbody or hydrogen atmosphere) polar cap emission by energetic electrons/positrons of small optical depth presumably in the pulsar magnetosphere and wind. This spectral model implies that all soft X-rays are of purely thermal origin, which has profound implications in the study of neutron star structure and fundamental pulsar physics.

引用

页码：L55 / L58

页数：4

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