The warped nuclear disk of radio galaxy 3C 449

Show simple item record Tremblay, Grant en_US Quillen, Alice en_US Floyd, David en_US Noel-Storr, Jacob en_US Baum, Stefi en_US Axon, David en_US O'Dea, Christopher en_US Chiaberge, Marco en_US Macchetto, Duccio en_US Sparks, William en_US Miley, George en_US Capetti, Alessandro en_US Madrid, Juan en_US Perlman, Eric en_US 2006-05-09T19:16:37Z en_US 2006-05-09T19:16:37Z en_US 2006 en_US
dc.identifier.citation Astrophysical Journal 643 (2006) 101-114 en_US
dc.identifier.issn 1538-4357 en_US
dc.identifier.uri en_US
dc.description.abstract Among 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.sponsorship This 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.extent 387479 bytes en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.publisher Astrophysical Journal en_US
dc.relation.ispartofseries vol. 643 en_US
dc.relation.ispartofseries pps. 101-114 en_US
dc.subject Galaxies-active en_US
dc.subject Galaxies-individual (3C449) en_US
dc.title The warped nuclear disk of radio galaxy 3C 449 en_US
dc.type Article en_US

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