Line Shifts, Broad-Line Region Inflow, And The Feeding Of Active Galactic Nuclei

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dc.contributor.utaustinauthorGaskell, C. Martinen_US
dc.creatorGaskell, C. Martinen_US
dc.creatorGoosmann, Rene W.en_US
dc.date.accessioned2016-04-28T19:36:11Z
dc.date.available2016-04-28T19:36:11Z
dc.date.issued2013-05en
dc.description.abstractVelocity-resolved reverberation mapping suggests that the broad-line regions (BLRs) of active galactic nuclei (AGNs) can have significant net inflow. We use the STOKES radiative transfer code to show that electron and Rayleigh scattering off the BLR and torus naturally explains the blueshifted profiles of high-ionization lines and the ionization dependence of the blueshifts. This result is insensitive to the geometry of the scattering region. If correct, then this model resolves the long-standing conflict between the absence of outflow implied by velocity-resolved reverberation mapping and the need for outflow if the blueshifting is the result of obscuration. The accretion rate implied by the inflow is sufficient to power the AGN. We suggest that the BLR is part of the outer accretion disk and that similar magnetohydrodynamic processes are operating. In the scattering model, the blueshifting is proportional to the accretion rate so high-accretion-rate AGNs will show greater high-ionization line blueshifts, as is observed. Scattering can lead to systematically too high black hole mass estimates from the C IV line. We note many similarities between narrow-line region (NLR) and BLR blueshiftings, and suggest that NLR blueshiftings have a similar explanation. Our model explains the higher blueshifts of broad absorption line QSOs if they are more highly inclined. Rayleigh scattering from the BLR and torus could be more important in the UV than electron scattering for predominantly neutral material around AGNs. The importance of Rayleigh scattering versus electron scattering can be assessed by comparing line profiles at different wavelengths arising from the same emission-line region.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipUS National Science Foundation AST 03-07912, AST 08-03883en_US
dc.description.sponsorshipSpace Telescope Science Institute AR-09926.01en_US
dc.description.sponsorshipGEMINI-CONICYT Fund of Chile 32070017en_US
dc.description.sponsorshipFONDECYT of Chile 1120957en_US
dc.description.sponsorshipFrench GdR PCHEen_US
dc.description.sponsorshipCenter for Theoretical Astrophysics (CTA) through Czech Ministry of Education, Youth and Sports LC06014en_US
dc.description.sponsorshipANR-11-JS56-013-01en_US
dc.identifierdoi:10.15781/T2VN6N
dc.identifier.Filename2013_05_lineshifts.pdfen_US
dc.identifier.citationGaskell, C. Martin, and Ren� W. Goosmann. "Line shifts, broad-line region inflow, and the feeding of active galactic nuclei." The Astrophysical Journal, Vol. 769, No. 1 (May., 2013): 30.en_US
dc.identifier.doi10.1088/0004-637x/769/1/30en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34874
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journalen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.rights.restrictionOpenen_US
dc.subjectaccretion, accretion disksen_US
dc.subjectblack hole physicsen_US
dc.subjectgalaxies: activeen_US
dc.subjectline:en_US
dc.subjectprofilesen_US
dc.subjectquasars: emission linesen_US
dc.subjectscatteringen_US
dc.subjectquasi-stellar objectsen_US
dc.subjectcentral black-holeen_US
dc.subjectemission-lineen_US
dc.subjectseyfert-galaxiesen_US
dc.subjectelectron-scatteringen_US
dc.subjectaccretion disksen_US
dc.subjectphysicalen_US
dc.subjectconditionsen_US
dc.subjectuv polarizationen_US
dc.subjecthigh-ionizationen_US
dc.subjecthigh-redshiften_US
dc.subjectastronomy & astrophysicsen_US
dc.titleLine Shifts, Broad-Line Region Inflow, And The Feeding Of Active Galactic Nucleien_US
dc.typeArticleen_US

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