X-ray Halo of the Pulsar 4U 1538-52 from SRG Data

被引：1

作者：

Shtykovsky, A. E. ^{[1
,2
]}

Lutovinov, A. A. ^{[1
]}

Krivonos, R. A. ^{[1
]}

Gilfanov, M. R. ^{[1
,3
]}

Medvedev, P. S. ^{[1
]}

Mereminskiy, I. A. ^{[1
]}

Arefiev, V. A. ^{[1
]}

Molkov, S. V. ^{[1
]}

Sunyaev, R. A. ^{[1
]}

机构：

[1] Russian Acad Sci, Space Res Inst, Moscow 117997, Russia

[2] Natl Res Univ Higher Sch Econ, Moscow 101100, Russia

[3] Max Planck Inst Astrophys, Postfach 1317, D-85741 Garching, Germany

来源：

ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS | 2023年 / 49卷 / 05期

基金：

俄罗斯基础研究基金会;

关键词：

X-ray pulsars; neutron stars; 4U; 1538-52; SCATTERING; ABSORPTION; SPECTRUM; GRAINS; LINE;

D O I：

10.1134/S1063773723050031

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the first results of the SRG observation of the pulsar 4U 1538-52 based on ART-XC and eROSITA data. An extended emission in the form of a halo is detected around the source in the 0.5-8 keV energy band. Our simulation has shown that its surface brightness distribution can be described by a two-component model composed of a flat disk similar to 250 '' in radius and a beta-model with a characteristic size similar to 480 ''. We have constructed a broadband spectrum of 4U 1538-52 in the energy range 0.5-30 keV, which can be fitted by a weakly absorbed (N-H similar or equal to 0.7 x 10(22) cm(-2)) power law with a high-energy cutoff. In addition, iron emission lines are detected in the pulsar spectrum at 6-7 keV. We show that the observed halo spectrumis considerably softer (a power-law index similar or equal to 2.8) than the pulsar spectrum(a power-law index similar or equal to 0.9), consistent with the predictions of theoretical models for the X-ray scattering by dust.

引用

页码：240 / 248

页数：9

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