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  Observations of Her X-1 in low states during SRG/eROSITA all-sky survey

Shakura, N. I., Kolesnikov, D. A., Medvedev, P. S., Sunyaev, R. A., Gilfanov, M. R., Postnov, K. A., et al. (2021). Observations of Her X-1 in low states during SRG/eROSITA all-sky survey. Astronomy and Astrophysics, 648: A39. doi:10.1051/0004-6361/202040145.

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Shakura, N. I., Author
Kolesnikov, D. A., Author
Medvedev, P. S.1, Author           
Sunyaev, R. A.2, Author           
Gilfanov, M. R.2, Author           
Postnov, K. A., Author
Molkov, S. V., Author
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1MPI for Astrophysics, Max Planck Society, ou_159875              
2High Energy Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159881              

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 Abstract: eROSITA (extended ROentgen Survey with an Imaging Telescope Array) instrument onboard the Russian-German ‘Spectrum-Roentgen-Gamma’ (SRG) mission observed the Her X-1/HZ Her binary system in multiple scans over the source during the first and second SRG all-sky surveys. Both observations occurred during a low state of the X-ray source when the outer parts of the accretion disk blocked the neutron star from view. The orbital modulation of the X-ray flux was detected during the low states. We argue that the detected X-ray radiation results from scattering of the emission of the central source by three distinct regions: (a) an optically thin hot corona with temperature ~(2−4) × 106 K above the irradiated hemisphere of the optical star; (b) an optically thin hot halo above the accretion disk; and (c) the optically thick cold atmosphere of the optical star. The latter region effectively scatters photons with energies above 5–6 keV.

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Language(s): eng - English
 Dates: 2021-04-09
 Publication Status: Published online
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 Identifiers: DOI: 10.1051/0004-6361/202040145
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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 648 Sequence Number: A39 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1