dc.contributor.author |
Shakura N.I. |
|
dc.contributor.author |
Kolesnikov D.A. |
|
dc.contributor.author |
Medvedev P.S. |
|
dc.contributor.author |
Sunyaev R.A. |
|
dc.contributor.author |
Gilfanov M.R. |
|
dc.contributor.author |
Postnov K.A. |
|
dc.contributor.author |
Molkov S.V. |
|
dc.date.accessioned |
2022-02-09T20:30:32Z |
|
dc.date.available |
2022-02-09T20:30:32Z |
|
dc.date.issued |
2021 |
|
dc.identifier.issn |
0004-6361 |
|
dc.identifier.uri |
https://dspace.kpfu.ru/xmlui/handle/net/168634 |
|
dc.description.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) × 10K 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. |
|
dc.relation.ispartofseries |
Astronomy and Astrophysics |
|
dc.subject |
Accretion, accretion disks |
|
dc.subject |
Binaries: close |
|
dc.subject |
Stars: neutron |
|
dc.subject |
X-rays: binaries |
|
dc.title |
Observations of Her X-1 in low states during SRG/eROSITA all-sky survey |
|
dc.type |
Review |
|
dc.relation.ispartofseries-volume |
648 |
|
dc.collection |
Публикации сотрудников КФУ |
|
dc.source.id |
SCOPUS00046361-2021-648-SID85104204839 |
|