The SOUX AGN sample: optical/UV/X-ray SEDs and the nature of the disc

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

The SOUX AGN sample: optical/UV/X-ray SEDs and the nature of the disc

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

The SOUX AGN sample: optical/UV/X-ray SEDs and the nature of the disc

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/GJ19-05599Y" target="_blank" >GJ19-05599Y: Sjednocení černých děr napříč hmotností</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

1365-2966

Svazek periodika

524

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

30

Strana od-do

1796-1825

Kód UT WoS článku

001030665500003

EID výsledku v databázi Scopus

2-s2.0-85165668904