A Hard Look at Thermal Reverberation and Optical/Ultraviolet Lags in NGC 5548
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F19%3A00518064" target="_blank" >RIV/67985815:_____/19:00518064 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.3847/2041-8213/ab2a72" target="_blank" >https://doi.org/10.3847/2041-8213/ab2a72</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3847/2041-8213/ab2a72" target="_blank" >10.3847/2041-8213/ab2a72</a>
Alternative languages
Result language
angličtina
Original language name
A Hard Look at Thermal Reverberation and Optical/Ultraviolet Lags in NGC 5548
Original language description
The ultraviolet (UV)/optical variations in many active galactic nuclei are very well correlated, showing delays that increase with increasing wavelength. It is thought that this is due to thermal reprocessing of the X-ray emission by the accretion disk. In this scenario, the variable X-ray flux from the corona illuminates the accretion disk where it is partially reflected, and partially absorbed and thermalized in the disk producing a UV/optical reverberation signal. This leads to time lags that increase with wavelength. However, although the shape of the observed time lags as a function of wavelength is consistent with the model predictions, their amplitude suggests the presence of a disk that is significantly hotter than expected. In this work, we estimate the response functions and the corresponding time lags assuming a standard Novikov-Thorne accretion disk illuminated by a point-like X-ray source.
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/GA18-00533S" target="_blank" >GA18-00533S: Reverberation from Black Hole accretion discs</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2019
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
879
Issue of the periodical within the volume
2
Country of publishing house
US - UNITED STATES
Number of pages
5
Pages from-to
L24
UT code for WoS article
000474930500005
EID of the result in the Scopus database
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