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

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We present the first results of the SRG observation of the pulsar 4U 1538–52 based on ARC-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 250 in radius and a b-model with a characteristic size 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 (
NH=0,7*1022 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 spectrum is considerably softer (a power-law index 2.8) than the pulsar spectrum (a power-law index 0.9), consistent with the predictions of theoretical models for the X-ray scattering by dust.

作者简介

A. Shtykovsky

Space Research Institute, Russian Academy of Sciences; National Research University ‘‘Higher School of Economics’

Email: a.shtykovsky@cosmos.ru
117997, Moscow, Russia; 101100, Moscow, Russia

A. Lutovinov

Space Research Institute, Russian Academy of Sciences

Email: a.shtykovsky@cosmos.ru
117997, Moscow, Russia

R. Krivonos

Space Research Institute, Russian Academy of Sciences

Email: a.shtykovsky@cosmos.ru
117997, Moscow, Russia

M. Gilfanov

Space Research Institute, Russian Academy of Sciences; Max Planck Institut für Astrophysik

Email: a.shtykovsky@cosmos.ru
117997, Moscow, Russia; Postfach 1317, D-85741, Garching, Germany

P. Medvedev

Space Research Institute, Russian Academy of Sciences

Email: a.shtykovsky@cosmos.ru
117997, Moscow, Russia

I. Mereminskiy

Space Research Institute, Russian Academy of Sciences

Email: a.shtykovsky@cosmos.ru
117997, Moscow, Russia

V. Arefiev

Space Research Institute, Russian Academy of Sciences

Email: a.shtykovsky@cosmos.ru
117997, Moscow, Russia

S. Molkov

Space Research Institute, Russian Academy of Sciences

Email: a.shtykovsky@cosmos.ru
117997, Moscow, Russia

R. Sunyaev

Space Research Institute, Russian Academy of Sciences

编辑信件的主要联系方式.
Email: a.shtykovsky@cosmos.ru
117997, Moscow, Russia

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