Spectral and polarimetric signatures of X-ray eclipses in AGNs

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F18%3A00496105" target="_blank" >RIV/67985815:_____/18:00496105 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1093/mnras/sty2084" target="_blank" >http://dx.doi.org/10.1093/mnras/sty2084</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/sty2084" target="_blank" >10.1093/mnras/sty2084</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Spectral and polarimetric signatures of X-ray eclipses in AGNs

Popis výsledku v původním jazyce

In this work, we aim to model the spectral and polarization variability arising from X-ray obscuration events, serving as probes of the relativistic effects that dominate the emission from the innermost regions. We show that asymmetries can be clearly detected in the AGNs spectra as the cloud is shading different parts of the accretion disc. We also show that these effects can be detected in the temporal evolution of the polarization degree (P) and the polarization position angle (Ψ). The variations in P and Ψ are highly dependent on the inclination of the system, the position of the primary source and its intrinsic polarization. Considering the disc-corona system only, for an inclination θ = 30° (60°), P increases up to ˜20 per cent (30 per cent) in the 4-8 keV band, when the unpolarized primary source is obscured. However, after accounting for the contribution of parsec-scale material scattering the light in our line of sight (narrow-line region and molecular torus), the variability is smoothed out and the polarization degree can be reduced down to {˜ } 1{{ per cent}} (2 per cent). Our results suggest that the study of eclipses in AGNs with the next generation of X-ray spectral and polarimetric missions could provide unique information on the physics and structure of the innermost regions as well as of the parsec-scale material.

Název v anglickém jazyce

Spectral and polarimetric signatures of X-ray eclipses in AGNs

Popis výsledku anglicky

In this work, we aim to model the spectral and polarization variability arising from X-ray obscuration events, serving as probes of the relativistic effects that dominate the emission from the innermost regions. We show that asymmetries can be clearly detected in the AGNs spectra as the cloud is shading different parts of the accretion disc. We also show that these effects can be detected in the temporal evolution of the polarization degree (P) and the polarization position angle (Ψ). The variations in P and Ψ are highly dependent on the inclination of the system, the position of the primary source and its intrinsic polarization. Considering the disc-corona system only, for an inclination θ = 30° (60°), P increases up to ˜20 per cent (30 per cent) in the 4-8 keV band, when the unpolarized primary source is obscured. However, after accounting for the contribution of parsec-scale material scattering the light in our line of sight (narrow-line region and molecular torus), the variability is smoothed out and the polarization degree can be reduced down to {˜ } 1{{ per cent}} (2 per cent). Our results suggest that the study of eclipses in AGNs with the next generation of X-ray spectral and polarimetric missions could provide unique information on the physics and structure of the innermost regions as well as of the parsec-scale material.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

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

1365-2966

e-ISSN

—

Svazek periodika

480

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

14

Strana od-do

3243-3256

Kód UT WoS článku

000449616200033

EID výsledku v databázi Scopus

2-s2.0-85054771131