SPATIALLY RESOLVED SPECTRA OF THE "TEACUP" ACTIVE GALACTIC NUCLEUS: TRACING THE HISTORY OF A DYING QUASAR

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dc.contributor.authorGagne, J. P.
dc.contributor.authorCrenshaw, D. M.
dc.contributor.authorKraemer, S. B.
dc.contributor.authorSchmitt, H. R.
dc.contributor.authorKeel, W. C.
dc.contributor.authorRafter, S.
dc.contributor.authorFischer, T. C.
dc.contributor.authorBennert, V. N.
dc.contributor.authorSchawinski, K.
dc.contributor.otherUniversity System of Georgia
dc.contributor.otherGeorgia State University
dc.contributor.otherCatholic University of America
dc.contributor.otherUnited States Department of Defense
dc.contributor.otherUnited States Navy
dc.contributor.otherNaval Research Laboratory
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.contributor.otherTechnion Israel Institute of Technology
dc.contributor.otherCalifornia State University System
dc.contributor.otherCalifornia Polytechnic State University San Luis Obispo
dc.contributor.otherSwiss Federal Institutes of Technology Domain
dc.contributor.otherETH Zurich
dc.date.accessioned2018-09-25T20:29:05Z
dc.date.available2018-09-25T20:29:05Z
dc.date.issued2014
dc.description.abstractThe Sloan Digital Sky Survey (SDSS) Galaxy Zoo project has revealed a number of spectacular galaxies possessing extended emission-line regions (EELRs), the most famous being Hanny's Voorwerp galaxy. We present another EELR object discovered in the SDSS endeavor: the Teacup active galactic nucleus (AGN). Nicknamed for its EELR, which has a "handle"-like structure protruding 15 kpc into the northeast quadrant of the galaxy. We analyze the physical conditions of this galaxy with long-slit, ground-based spectroscopy from the Lowell, Lick, and KPNO observatories. With the Lowell 1.8 m Perkin's telescope we took multiple observations at different offset positions, allowing us to recover spatially resolved spectra across the galaxy. Line diagnostics indicate the ionized gas is photoionized primarily by the AGN. Additionally we are able to derive the hydrogen density from the [S II]lambda 6716/.6731 ratio. We generated two-component photoionization models for each spatially resolved Lowell spectrum. These models allow us to calculate the AGN bolometric luminosity seen by the gas at different radii from the nuclear center of the Teacup. Our results show a drop in bolometric luminosity by more than two orders of magnitude from the EELR to the nucleus, suggesting that the AGN has decreased in luminosity by this amount in a continuous fashion over 46,000 yr, supporting the case for a dying AGN in this galaxy independent of any IR based evidence. We demonstrate that spatially resolved photoionization modeling could be applied to EELRs to investigate long timescale variability.en_US
dc.format.mimetypeapplication/pdf
dc.identifier.citationGagne, J., et al. (2014): Spatially Resolved Spectra of the “Teacup” Active Galactic Nucleus: Tracing the History of a Dying Quasar. The Astrophysical Journal, 792(1). DOI: 10.1088/0004-637X/792/1/72
dc.identifier.doi10.1088/0004-637X/792/1/72
dc.identifier.orcidhttps://orcid.org/0000-0001-5464-0888
dc.identifier.urihttp://ir.ua.edu/handle/123456789/3965
dc.languageEnglish
dc.language.isoen_US
dc.publisherIOP Publishing
dc.subjectcosmic rays
dc.subjectgalaxies: active
dc.subjectgalaxies: kinematics and dynamics
dc.subjectgalaxies: Seyfert
dc.subjectquasars: emission lines
dc.subjecttechniques: spectroscopic
dc.subjectNARROW-LINE REGION
dc.subjectPHYSICAL CONDITIONS
dc.subjectGALAXY
dc.subjectEMISSION
dc.subjectCLASSIFICATION
dc.subjectMODELS
dc.subjectSKY
dc.subjectAstronomy & Astrophysics
dc.titleSPATIALLY RESOLVED SPECTRA OF THE "TEACUP" ACTIVE GALACTIC NUCLEUS: TRACING THE HISTORY OF A DYING QUASARen_US
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dc.typeArticle
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