Investigating model dependencies for obscured active galactic nuclei: A case study of NGC 3982

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F24%3A00585711" target="_blank" >RIV/67985815:_____/24:00585711 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216224:14310/24:00135971

Výsledek na webu

<a href="https://hdl.handle.net/11104/0353909" target="_blank" >https://hdl.handle.net/11104/0353909</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/1538-4357/ad3235" target="_blank" >10.3847/1538-4357/ad3235</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Investigating model dependencies for obscured active galactic nuclei: A case study of NGC 3982

Popis výsledku v původním jazyce

X-ray spectroscopy of heavily obscured active galactic nuclei (AGN) offers a unique opportunity to study the circumnuclear environment of accreting supermassive black holes. However, individual models describing the obscurer have unique parameter spaces that give distinct parameter posterior distributions when fit to the same data. To assess the impact of model-specific parameter dependencies, we present a case study of the nearby heavily obscured low-luminosity AGN NGC 3982, which has a variety of column density estimations reported in the literature. We fit the same broadband XMM-Newton+NuSTAR spectra of the source with five unique obscuration models and generate posterior parameter distributions for each. By using global parameter exploration, we traverse the full prior-defined parameter space to accurately reproduce complex posterior shapes and inter-parameter degeneracies. The unique model posteriors for the line-of-sight column density are broadly consistent, predicting Compton-thick N-H > 1.5 x 10(24) cm(-2) at the 3 sigma confidence level. The posterior median intrinsic X-ray luminosity in the 2-10 keV band was found to differ substantially, however, with values in the range log L (2-10 keV)/ erg s(-1 )= 40.9-42.1 for the individual models. We additionally show that the posterior distributions for each model occupy unique regions of their respective multidimensional parameter spaces and how such differences can propagate into the inferred properties of the central engine. We conclude by showcasing the improvement in parameter inference attainable with the High Energy X-ray Probe, with its uniquely broad, simultaneous, and high-sensitivity bandpass of 0.2-80 keV.

Název v anglickém jazyce

Investigating model dependencies for obscured active galactic nuclei: A case study of NGC 3982

Popis výsledku anglicky

X-ray spectroscopy of heavily obscured active galactic nuclei (AGN) offers a unique opportunity to study the circumnuclear environment of accreting supermassive black holes. However, individual models describing the obscurer have unique parameter spaces that give distinct parameter posterior distributions when fit to the same data. To assess the impact of model-specific parameter dependencies, we present a case study of the nearby heavily obscured low-luminosity AGN NGC 3982, which has a variety of column density estimations reported in the literature. We fit the same broadband XMM-Newton+NuSTAR spectra of the source with five unique obscuration models and generate posterior parameter distributions for each. By using global parameter exploration, we traverse the full prior-defined parameter space to accurately reproduce complex posterior shapes and inter-parameter degeneracies. The unique model posteriors for the line-of-sight column density are broadly consistent, predicting Compton-thick N-H > 1.5 x 10(24) cm(-2) at the 3 sigma confidence level. The posterior median intrinsic X-ray luminosity in the 2-10 keV band was found to differ substantially, however, with values in the range log L (2-10 keV)/ erg s(-1 )= 40.9-42.1 for the individual models. We additionally show that the posterior distributions for each model occupy unique regions of their respective multidimensional parameter spaces and how such differences can propagate into the inferred properties of the central engine. We conclude by showcasing the improvement in parameter inference attainable with the High Energy X-ray Probe, with its uniquely broad, simultaneous, and high-sensitivity bandpass of 0.2-80 keV.

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/GA22-22643S" target="_blank" >GA22-22643S: Galaktická gastronomie: Hrášky a Borůvky</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Astrophysical Journal

ISSN

0004-637X

e-ISSN

1538-4357

Svazek periodika

966

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

20

Strana od-do

116

Kód UT WoS článku

001209441100001

EID výsledku v databázi Scopus

2-s2.0-85192148035