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dc.contributor.authorSobolewska, Malgosia
dc.contributor.authorSiemiginowska, Aneta
dc.contributor.authorGuainazzi, Matteo
dc.contributor.authorHardcastle, Martin
dc.contributor.authorMigliori, Giulia
dc.contributor.authorOstorero, Luisa
dc.contributor.authorStawarz, Lukasz
dc.date.accessioned2020-09-24T00:07:46Z
dc.date.available2020-09-24T00:07:46Z
dc.date.issued2019-10-22
dc.identifier.citationSobolewska , M , Siemiginowska , A , Guainazzi , M , Hardcastle , M , Migliori , G , Ostorero , L & Stawarz , L 2019 , ' First Hard X-ray Observation of a Compact Symmetric Object : A Broadband X-ray Study of a radio galaxy OQ+208 with NuSTAR and Chandra ' , The Astrophysical Journal . https://doi.org/10.3847/1538-4357/ab3ec3
dc.identifier.issn0004-637X
dc.identifier.otherPURE: 17369231
dc.identifier.otherPURE UUID: 5d41d157-15ac-4195-8f31-9814e2af6525
dc.identifier.otherArXiv: http://arxiv.org/abs/1909.02084v1
dc.identifier.otherScopus: 85075189851
dc.identifier.urihttp://hdl.handle.net/2299/23163
dc.description© 2019 IOP Publishing Ltd. This is an author-created, un-copyedited version of an article accepted for publication in The Astrophysical Journal. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it.
dc.description.abstractCompact Symmetric Objects (CSOs) have been observed with Chandra and XMM-Newton to gain insights into the initial stages of a radio source evolution and probe the black hole activity at the time of relativistic outflow formation. However, there have been no CSO observations to date at the hard X-ray energies (> 10 keV), impeding our ability to robustly constrain the properties of the intrinsic X-ray emission and of the medium surrounding the young expanding jets. We present the first hard X-ray observation of a CSO performed with NuSTAR. Our target, OQ+208, is detected up to 30 keV, and thus we establish CSOs as a new class of NuSTAR sources. We analyze the NuSTAR data jointly with our new Chandra and archival XMM-Newton data and find that a young, ~250 years old, radio jet spanning the length of ~10 pc coexists with cold obscuring matter, consistent with a dusty torus, with an equivalent hydrogen column density $N_H = 10^{23}$-$10^{24}$ cm$^{-2}$. The primary X-ray emission is characterized by a photon index $\Gamma \sim 1.45$ and intrinsic 0.5-30 keV luminosity $L \sim 10^{43}$ erg s$^{-1}$. The results of our spectral modeling and broad-line optical classification of the source suggest a porous structure of the obscuring torus. Alternatively, the source may belong to the class of optically un-obscured/X-ray obscured AGN. The observed X-ray emission is too weak compared to that predicted by the expanding radio lobes model, leaving an accretion disk corona or jets as the possible origins of the X-ray emission from this young radio galaxy.en
dc.language.isoeng
dc.relation.ispartofThe Astrophysical Journal
dc.subjectastro-ph.HE
dc.titleFirst Hard X-ray Observation of a Compact Symmetric Object : A Broadband X-ray Study of a radio galaxy OQ+208 with NuSTAR and Chandraen
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.3847/1538-4357/ab3ec3
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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