Coronal Properties of Black Hole X-Ray Binaries in the Hard State as Seen by NuSTAR and Swift
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F20%3A00537272" target="_blank" >RIV/67985815:_____/20:00537272 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.3847/2041-8213/ab665e" target="_blank" >https://doi.org/10.3847/2041-8213/ab665e</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3847/2041-8213/ab665e" target="_blank" >10.3847/2041-8213/ab665e</a>
Alternative languages
Result language
angličtina
Original language name
Coronal Properties of Black Hole X-Ray Binaries in the Hard State as Seen by NuSTAR and Swift
Original language description
In this work we measure two important phenomenological parameters of corona (and hot accretion flow) in black hole X-ray binaries: the photon index “Gamma” and the electron temperature kTe. Thanks to the capability of the Nuclear Spectroscopic Telescope Array in hard X-rays, we measure these two parameters over six orders of magnitude in the 0.1-100 keV X-ray luminosity Lx, from 5.x.1038 erg s-1 down to as low as 5.x.1032 erg s-1. We confirm the existence of a “V”-shaped correlation between “Gamma” and Lx. Surprisingly, we observe a “Lambda” - shaped correlation between kTe and Lx. The cooler when brighter branch in the high-luminosity regime (Lx. 3.x.1036 erg s-1) agrees with previous results and can be understood under the existing model of Compton scattering in the corona. On the other hand, the apparent cooler when fainter (positive kTe-Lx correlation) branch in the low-luminosity regime (Lx. 3.x.1036 erg s-1) is unexpected, thus it puts a new challenge to existing models of hot accretion flow/corona.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
<a href="/en/project/GA17-02430S" target="_blank" >GA17-02430S: Geometrical properties of the accretion disc corona in Active Galactic Nuclei</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astrophysical Journal Letters
ISSN
2041-8213
e-ISSN
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Volume of the periodical
889
Issue of the periodical within the volume
1
Country of publishing house
US - UNITED STATES
Number of pages
9
Pages from-to
L18
UT code for WoS article
000520440200001
EID of the result in the Scopus database
2-s2.0-85080098338