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dc.contributor.authorTremblay, Granten_US
dc.contributor.authorQuillen, Aliceen_US
dc.contributor.authorFloyd, Daviden_US
dc.contributor.authorNoel-Storr, Jacoben_US
dc.contributor.authorBaum, Stefien_US
dc.contributor.authorAxon, Daviden_US
dc.contributor.authorO'Dea, Christopheren_US
dc.contributor.authorChiaberge, Marcoen_US
dc.contributor.authorMacchetto, Duccioen_US
dc.contributor.authorSparks, Williamen_US
dc.contributor.authorMiley, Georgeen_US
dc.contributor.authorCapetti, Alessandroen_US
dc.contributor.authorMadrid, Juanen_US
dc.contributor.authorPerlman, Ericen_US
dc.identifier.citationAstrophysical Journal 643 (2006) 101-114en_US
dc.description.abstractAmong radio galaxies containing nuclear dust disks, the bipolar jet axis is generally observed to be perpendicular to the disk major axis. The FR I radio source 3C 449 is an outlier to this statistical majority, as it possesses a nearly parallel jet/disk orientation on the sky. We examine the 600 pc dusty disk in this galaxy with images from the Hubble Space Telescope. We find that a 1.6 µm/0.7 µm colormap of the disk exhibits a twist in its isocolor contours (isochromes). We model the colormap by integrating galactic starlight through an absorptive disk, and find that the anomalous twist in the isochromes can be reproduced in the model with a vertically thin, warped disk. The model predicts that the disk is nearly perpendicular to the jet axis within 100 pc of the nucleus. We discuss physical mechanisms capable of causing such a warp. We show that precessional models or a torque on the disk arising from a possible binary black hole in the AGN causes precession on a timescale that is too long to account for the predicted disk morphology. However, we estimate that the pressure in the X-ray emitting interstellar medium is large enough to perturb the disk, and argue that jet-driven anisotropy in the excited ISM may be the cause of the warp. In this way, the warped disk in 3C 449 may be a new manifestation of feedback from an active galactic nucleus. (Refer to PDF file for exact formulas).en_US
dc.description.sponsorshipThis work was based on observations with the NASA/ESA Hubble Space Telescope, obtained in collaboration with the Space Telescope Science Institute (STScI), operated by AURA for NASA. Support for this work was provided by NASA/STScI through grant HSTGO- 10173. G. R. T. and A. C. Q. acknowledge support in part by NSF awards AST-0406823, PHY-0242483, and NASA/STScI grant HST-GO-10173.09-A. This research has made extensive use of the NASA Astrophysics Data System (ADS) and the NASA/IPAC Extragalactic Database (NED), operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.en_US
dc.format.extent387479 bytesen_US
dc.publisherAstrophysical Journalen_US
dc.relation.ispartofseriesvol. 643en_US
dc.relation.ispartofseriespps. 101-114en_US
dc.subjectGalaxies-individual (3C449)en_US
dc.titleThe warped nuclear disk of radio galaxy 3C 449en_US

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