The SOUX AGN sample: optical/UV/X-ray SEDs and the nature of the disc
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F23%3A00574938" target="_blank" >RIV/67985815:_____/23:00574938 - isvavai.cz</a>
Result on the web
<a href="https://hdl.handle.net/11104/0345208" target="_blank" >https://hdl.handle.net/11104/0345208</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1093/mnras/stad1830" target="_blank" >10.1093/mnras/stad1830</a>
Alternative languages
Result language
angličtina
Original language name
The SOUX AGN sample: optical/UV/X-ray SEDs and the nature of the disc
Original language description
We use the SOUX sample of & SIM, 700 active galactic nucleus (AGN) to form average optical-ultraviolet (UV)-X-rays spectral energy distributions (SEDs) on a two-dimensional (2D) grid of M-BH and L-2500. We compare these with the predictions of a new AGN SED model, qsosed, which includes prescriptions for both hot and warm Comptonization regions as well as an outer standard disc. This predicts the overall SED fairly well for 7.5 < log(M-BH/M-& ODOT) < 9.0 over a wide range in L/L-Edd, but at higher masses the outer disc spectra in the model are far too cool to match the data. We create optical-UV composites from the entire Sloan Digital Sky Survey sample and use these to show that the mismatch is due to there being no significant change in spectral shape of the optical-UV continuum across several decades of M-BH at constant luminosity. We show for the first time that this cannot be matched by standard disc models with high black hole spin. These apparently fit, but are not self-consistent as they do not include the General Relativistic effects for the emission to reach the observer. At high spin, increased gravitational redshift compensates for almost all of the higher temperature emission from the smaller inner disc radii. The data do not match the predictions made by any current accretion flow model. Either the disc is completely covered by a warm Comptonization layer whose properties change systematically with L/L-Edd, or the accretion flow structure is fundamentally different to that of the standard disc models.
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
—
OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
<a href="/en/project/GJ19-05599Y" target="_blank" >GJ19-05599Y: Unification of Black Holes across the Mass Scale</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Monthly Notices of the Royal Astronomical Society
ISSN
0035-8711
e-ISSN
1365-2966
Volume of the periodical
524
Issue of the periodical within the volume
2
Country of publishing house
US - UNITED STATES
Number of pages
30
Pages from-to
1796-1825
UT code for WoS article
001030665500003
EID of the result in the Scopus database
2-s2.0-85165668904