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

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...

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Bibliographic Details
Published in:Astronomy letters 2023-05, Vol.49 (5), p.240-248
Main Authors: Shtykovsky, A. E., Lutovinov, A. A., Krivonos, R. A., Gilfanov, M. R., Medvedev, P. S., Mereminskiy, I. A., Arefiev, V. A., Molkov, S. V., Sunyaev, R. A.
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics and Astroparticles
Brightness distribution
Broadband
Emission
Emission lines
Emissions
Energy bands
Observations and Techniques
Physics
Physics and Astronomy
Power law
Pulsars
Spectrum allocation
Surface brightness
X-ray scattering
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Summary: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 in radius and a -model with a characteristic size . 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 ( cm ) 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 ) than the pulsar spectrum (a power-law index ), consistent with the predictions of theoretical models for the X-ray scattering by dust.
ISSN:1063-7737
1562-6873
DOI:10.1134/S1063773723050031