On the origin of the x-ray emission in heavily obscured compact radio sources

2024
journal article
article
dc.abstract.enX-ray continuum emission of active galactic nuclei (AGNs) may be reflected by circumnuclear dusty tori, producing prominent fluorescence iron lines at X-ray frequencies. Here, we discuss the broadband emission of three radio-loud AGNs belonging to the class of compact symmetric objects (CSOs), with detected narrow Fe Kα lines. CSOs have newly born radio jets, forming compact radio lobes with projected linear sizes of the order of a few to hundreds of parsecs. We model the radio-to-γ-ray spectra of compact lobes in J1407+2827, J1511+0518, and J2022+6137, which are among the nearest and the youngest CSOs known to date, and are characterized by an intrinsic X-ray absorbing column density of N$_{H}$ > 10$^{23}$ cm$^{-2}$. In addition to the archival data, we analyze the newly acquired Chandra X-ray Observatory and Submillimeter Array (SMA) observations, and also refine the γ-ray upper limits from Fermi Large Area Telescope monitoring. The new Chandra data exclude the presence of the extended X-ray emission components on scales larger than 1.''5. The SMA data unveil a correlation between the spectral index of the electron distribution in the lobes and N$_{H}$, which can explain the γ-ray quietness of heavily obscured CSOs. Based on our modeling, we argue that the inverse-Compton emission of compact radio lobes may account for the intrinsic X-ray continuum in all these sources. Furthermore, we propose that the observed iron lines may be produced by a reflection of the lobes' continuum from the surrounding cold dust.
dc.affiliationWydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomiczne
dc.contributor.authorKról, Dominika - 261432
dc.contributor.authorSobolewska, Małgosia
dc.contributor.authorStawarz, Łukasz - 132081
dc.contributor.authorSiemiginowska, Aneta
dc.contributor.authorMigliori, Giulia
dc.contributor.authorPrincipe, Giacomo
dc.contributor.authorGurwell, Mark A.
dc.date.accessioned2024-05-17T09:31:01Z
dc.date.available2024-05-17T09:31:01Z
dc.date.issued2024
dc.date.openaccess0
dc.description.accesstimew momencie opublikowania
dc.description.number2
dc.description.versionostateczna wersja wydawcy
dc.description.volume966
dc.identifier.articleid201
dc.identifier.doi10.3847/1538-4357/ad3632
dc.identifier.eissn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttps://ruj.uj.edu.pl/handle/item/340536
dc.languageeng
dc.language.containereng
dc.rightsUdzielam licencji. Uznanie autorstwa 4.0 Międzynarodowa
dc.rights.licenceCC-BY
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/legalcode.pl
dc.share.typeotwarte czasopismo
dc.subject.enactive galactic nuclei
dc.subject.enactive galaxies
dc.subject.enradio lobes
dc.subject.enjets
dc.subject.enhigh energy astrophysics
dc.subject.engamma-ray astronomy
dc.subject.enx-ray astronomy
dc.subject.enx-ray active galactic nuclei
dc.subject.enradio galaxies
dc.subtypeArticle
dc.titleOn the origin of the x-ray emission in heavily obscured compact radio sources
dc.title.journalAstrophysical Journal
dc.typeJournalArticle
dspace.entity.typePublicationen
dc.abstract.en
X-ray continuum emission of active galactic nuclei (AGNs) may be reflected by circumnuclear dusty tori, producing prominent fluorescence iron lines at X-ray frequencies. Here, we discuss the broadband emission of three radio-loud AGNs belonging to the class of compact symmetric objects (CSOs), with detected narrow Fe Kα lines. CSOs have newly born radio jets, forming compact radio lobes with projected linear sizes of the order of a few to hundreds of parsecs. We model the radio-to-γ-ray spectra of compact lobes in J1407+2827, J1511+0518, and J2022+6137, which are among the nearest and the youngest CSOs known to date, and are characterized by an intrinsic X-ray absorbing column density of N$_{H}$ > 10$^{23}$ cm$^{-2}$. In addition to the archival data, we analyze the newly acquired Chandra X-ray Observatory and Submillimeter Array (SMA) observations, and also refine the γ-ray upper limits from Fermi Large Area Telescope monitoring. The new Chandra data exclude the presence of the extended X-ray emission components on scales larger than 1.''5. The SMA data unveil a correlation between the spectral index of the electron distribution in the lobes and N$_{H}$, which can explain the γ-ray quietness of heavily obscured CSOs. Based on our modeling, we argue that the inverse-Compton emission of compact radio lobes may account for the intrinsic X-ray continuum in all these sources. Furthermore, we propose that the observed iron lines may be produced by a reflection of the lobes' continuum from the surrounding cold dust.
dc.affiliation
Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomiczne
dc.contributor.author
Król, Dominika - 261432
dc.contributor.author
Sobolewska, Małgosia
dc.contributor.author
Stawarz, Łukasz - 132081
dc.contributor.author
Siemiginowska, Aneta
dc.contributor.author
Migliori, Giulia
dc.contributor.author
Principe, Giacomo
dc.contributor.author
Gurwell, Mark A.
dc.date.accessioned
2024-05-17T09:31:01Z
dc.date.available
2024-05-17T09:31:01Z
dc.date.issued
2024
dc.date.openaccess
0
dc.description.accesstime
w momencie opublikowania
dc.description.number
2
dc.description.version
ostateczna wersja wydawcy
dc.description.volume
966
dc.identifier.articleid
201
dc.identifier.doi
10.3847/1538-4357/ad3632
dc.identifier.eissn
1538-4357
dc.identifier.issn
0004-637X
dc.identifier.uri
https://ruj.uj.edu.pl/handle/item/340536
dc.language
eng
dc.language.container
eng
dc.rights
Udzielam licencji. Uznanie autorstwa 4.0 Międzynarodowa
dc.rights.licence
CC-BY
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/legalcode.pl
dc.share.type
otwarte czasopismo
dc.subject.en
active galactic nuclei
dc.subject.en
active galaxies
dc.subject.en
radio lobes
dc.subject.en
jets
dc.subject.en
high energy astrophysics
dc.subject.en
gamma-ray astronomy
dc.subject.en
x-ray astronomy
dc.subject.en
x-ray active galactic nuclei
dc.subject.en
radio galaxies
dc.subtype
Article
dc.title
On the origin of the x-ray emission in heavily obscured compact radio sources
dc.title.journal
Astrophysical Journal
dc.type
JournalArticle
dspace.entity.typeen
Publication
Affiliations

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