Identification Of Outflows And Candidate Dual Active Galactic Nuclei In SDSS Quasars At Z=0.8-1.6

dc.contributor.utaustinauthorComerford, Julia M.en_US
dc.creatorBarrows, R. Scotten_US
dc.creatorLacy, Claud H. Sandbergen_US
dc.creatorKennefick, Juliaen_US
dc.creatorComerford, Julia M.en_US
dc.creatorKennefick, Danielen_US
dc.creatorBerrier, Joel C.en_US
dc.description.abstractWe present a sample of 131 quasars from the Sloan Digital Sky Survey at redshifts 0.8 < z < 1.6 with double peaks in either of the high-ionization narrow emission lines [Ne V]lambda 3426 or [Ne III]lambda 3869. These sources were selected with the intention of identifying high-redshift analogs of the z < 0.8 active galactic nuclei (AGNs) with double-peaked [O III]lambda 5007 lines, which might represent AGN outflows or dual AGNs. Lines of high ionization potential are believed to originate in the inner, highly photoionized portion of the narrow line region, and we exploit this assumption to investigate the possible kinematic origins of the double-peaked lines. For comparison, we measure the [Ne V]lambda 3426 and [Ne III]lambda 3869 double peaks in low-redshift (z < 0.8) [O III]-selected sources. We find that [Ne V]lambda 3426 and [Ne III]lambda 3869 show a correlation between line splitting and line width similar to that of [O III]lambda 5007 in other studies, and the velocity splittings are correlated with the quasar Eddington ratio. These results suggest an outflow origin for at least a subset of the double peaks, allowing us to study the high-ionization gas kinematics around quasars. However, we find that a non-negligible fraction of our sample show no evidence for an ionization stratification. For these sources, the outflow scenario is less compelling, leaving the dual AGN scenario as a viable possibility. Finally, we find that our sample shows an anti-correlation between the velocity-offset ratio and luminosity ratio of the components, which is a potential dynamical argument for the presence of dual AGNs. Therefore, this study serves as a first attempt at extending the selection of candidate dual AGNs to higher redshifts.en_US
dc.description.sponsorshipArkansas NASA EPSCoR program NNX08AW03Aen_US
dc.identifier.citationBarrows, R. Scott, Claud H. Sandberg Lacy, Julia Kennefick, Julia M. Comerford, Daniel Kennefick, and Joel C. Berrier. "Identification of Outflows and Candidate Dual Active Galactic Nuclei in SDSS Quasars at z= 0.8-1.6." The Astrophysical Journal, Vol. 769, No. 2 (Jun., 2013): 95.en_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.subjectgalaxies: activeen_US
dc.subjectgalaxies: high-redshiften_US
dc.subjectgalaxies: jetsen_US
dc.subjectquasars: emission linesen_US
dc.subjectnarrow-line regionen_US
dc.subjectdigital sky surveyen_US
dc.subjectsupermassive black-holesen_US
dc.subjectmajor galaxy mergersen_US
dc.subject7th data releaseen_US
dc.subjectradio galaxiesen_US
dc.subjectmass outflowsen_US
dc.subjectredshift quasarsen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleIdentification Of Outflows And Candidate Dual Active Galactic Nuclei In SDSS Quasars At Z=0.8-1.6en_US

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