A Hard Look at Thermal Reverberation and Optical/Ultraviolet Lags in NGC 5548

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

A Hard Look at Thermal Reverberation and Optical/Ultraviolet Lags in NGC 5548

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

A Hard Look at Thermal Reverberation and Optical/Ultraviolet Lags in NGC 5548

Popis výsledku anglicky

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.

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/GA18-00533S" target="_blank" >GA18-00533S: Reverberace akrečních disků černých děr</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Astrophysical Journal Letters

ISSN

2041-8213

e-ISSN

—

Svazek periodika

879

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

5

Strana od-do

L24

Kód UT WoS článku

000474930500005

EID výsledku v databázi Scopus

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