X-ray Halo of the Pulsar 4U 1538–52 from SRG Data
- Authors: 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
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Affiliations:
- Space Research Institute, Russian Academy of Sciences
- National Research University ‘‘Higher School of Economics’
- Max Planck Institut für Astrophysik
- Issue: Vol 49, No 5 (2023)
- Pages: 335-344
- Section: Articles
- URL: https://journals.rcsi.science/0320-0108/article/view/137183
- DOI: https://doi.org/10.31857/S0320010823050042
- EDN: https://elibrary.ru/GMSHNT
- ID: 137183
Cite item
Abstract
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.
Keywords
About the authors
A. E. 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. A. Lutovinov
Space Research Institute, Russian Academy of Sciences
Email: a.shtykovsky@cosmos.ru
117997, Moscow, Russia
R. A. Krivonos
Space Research Institute, Russian Academy of Sciences
Email: a.shtykovsky@cosmos.ru
117997, Moscow, Russia
M. R. 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. S. Medvedev
Space Research Institute, Russian Academy of Sciences
Email: a.shtykovsky@cosmos.ru
117997, Moscow, Russia
I. A. Mereminskiy
Space Research Institute, Russian Academy of Sciences
Email: a.shtykovsky@cosmos.ru
117997, Moscow, Russia
V. A. Arefiev
Space Research Institute, Russian Academy of Sciences
Email: a.shtykovsky@cosmos.ru
117997, Moscow, Russia
S. V. Molkov
Space Research Institute, Russian Academy of Sciences
Email: a.shtykovsky@cosmos.ru
117997, Moscow, Russia
R. A. Sunyaev
Space Research Institute, Russian Academy of Sciences
Author for correspondence.
Email: a.shtykovsky@cosmos.ru
117997, Moscow, Russia
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