Joint NuSTAR and Chandra analysis of the obscured quasar in IC 2497-Hanny's Voorwerp system

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dc.contributor.authorSartori, Lia F.
dc.contributor.authorSchawinski, Kevin
dc.contributor.authorKoss, Michael J.
dc.contributor.authorRicci, Claudio
dc.contributor.authorTreister, Ezequiel
dc.contributor.authorStern, Daniel
dc.contributor.authorLansbury, George
dc.contributor.authorMaksym, W. Peter
dc.contributor.authorBalokovic, Mislav
dc.contributor.authorGandhi, Poshak
dc.contributor.authorKeel, William C.
dc.contributor.authorBallantyne, David R.
dc.contributor.otherSwiss Federal Institutes of Technology Domain
dc.contributor.otherETH Zurich
dc.contributor.otherEureka Scientific
dc.contributor.otherPontificia Universidad Catolica de Chile
dc.contributor.otherPeking University
dc.contributor.otherCalifornia Institute of Technology
dc.contributor.otherNational Aeronautics & Space Administration (NASA)
dc.contributor.otherNASA Jet Propulsion Laboratory (JPL)
dc.contributor.otherUniversity of Cambridge
dc.contributor.otherHarvard University
dc.contributor.otherSmithsonian Astrophysical Observatory
dc.contributor.otherSmithsonian Institution
dc.contributor.otherUniversity of Southampton
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.contributor.otherUniversity System of Georgia
dc.contributor.otherGeorgia Institute of Technology
dc.date.accessioned2018-09-20T18:04:25Z
dc.date.available2018-09-20T18:04:25Z
dc.date.issued2017-11-17
dc.description.abstractWe present new Nuclear Spectroscopic Telescope Array (NuSTAR) observations of the core of IC 2497, the galaxy associated with Hanny's Voorwerp. The combined fits of the Chandra (0.5-8 keV) and NuSTAR (3-24 keV) X-ray spectra, together with WISE mid-IR photometry, optical longslit spectroscopy and optical narrow-band imaging, suggest that the galaxy hosts a Compton-thick active galactic nucleus (AGN) (N-H similar to 2 x 10(24) cm(-2), current intrinsic luminosity L-bol similar to 2-5 x 10(44) erg s(-1)) whose luminosity dropped by a factor of similar to 50 within the last similar to 100 kyr. This corresponds to a change in Eddington ratio (ER) from lambda(Edd) similar to 0.35 to lambda(Edd) similar to 0.007. We argue that the AGN in IC 2497 should not be classified as a changing-look AGN, but rather we favour the interpretation where the AGN is undergoing a change in accretion state (from radiatively efficient to radiatively inefficient). In this scenario, the observed drop in luminosity and ER corresponds to the final stage of an AGN accretion phase. Our results are consistent with previous studies in the optical, X-ray and radio although the magnitude of the drop is lower than previously suggested. In addition, we discuss a possible analogy between X-ray binaries and an AGN.en_US
dc.format.mimetypeapplication/pdf
dc.identifier.citationSartori, L. et al. (2017): Joint NuSTAR and Chandra analysis of the obscured quasar in IC 2497 - Hanny’s Voorwerp system. Monthly Notices of the Royal Astronomical Society, 474(2). DOI: https://doi.org/10.1093/mnras/stx2952
dc.identifier.doi10.1093/mnras/stx2952
dc.identifier.orcidhttps://orcid.org/0000-0001-5464-0888
dc.identifier.orcidhttps://orcid.org/0000-0001-8128-6976
dc.identifier.orcidhttps://orcid.org/0000-0002-5328-9827
dc.identifier.orcidhttps://orcid.org/0000-0003-2686-9241
dc.identifier.orcidhttps://orcid.org/0000-0001-7568-6412
dc.identifier.orcidhttps://orcid.org/0000-0001-8020-3884
dc.identifier.orcidhttps://orcid.org/0000-0002-2203-7889
dc.identifier.orcidhttps://orcid.org/0000-0003-0476-6647
dc.identifier.urihttp://ir.ua.edu/handle/123456789/3916
dc.languageEnglish
dc.language.isoen_US
dc.publisherOxford University Press
dc.rights.licenseAttribution 4.0 International (CC BY 4.0)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectgalaxies: active
dc.subjectquasars: general
dc.subjectquasars: individual (IC 2497)
dc.subjectX-rays: galaxies
dc.subjectACTIVE GALACTIC NUCLEI
dc.subjectRADIATIVELY INEFFICIENT ACCRETION
dc.subjectINFRARED-SURVEY-EXPLORER
dc.subjectSTAR-FORMING GALAXIES
dc.subjectREFERENCE SURVEY CARS
dc.subjectBLACK-HOLE GROWTH
dc.subjectX-RAY-EMISSION
dc.subjectHANNYS VOORWERP
dc.subjectSEYFERT-GALAXIES
dc.subjectMIDINFRARED SELECTION
dc.subjectAstronomy & Astrophysics
dc.titleJoint NuSTAR and Chandra analysis of the obscured quasar in IC 2497-Hanny's Voorwerp systemen_US
dc.typetext
dc.typeArticle
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