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The Inner Kiloparsec of Mrk 273 with Keck Adaptive Optics

U, Vivian and Medling, Anne and Sanders, David and Max, Claire and Armus, Lee and Iwasawa, Kazushi and Evans, Aaron and Kewley, Lisa and Fazio, Giovanni (2013) The Inner Kiloparsec of Mrk 273 with Keck Adaptive Optics. Astrophysical Journal, 775 (2). Art. No. 115. ISSN 0004-637X. doi:10.1088/0004-637X/775/2/115.

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There is X-ray, optical, and mid-infrared imaging and spectroscopic evidence that the late-stage ultraluminous infrared galaxy merger Mrk 273 hosts a powerful active galactic nucleus (AGN). However, the exact location of the AGN and the nature of the nucleus have been difficult to determine due to dust obscuration and the limited wavelength coverage of available high-resolution data. Here we present near-infrared integral-field spectra and images of the nuclear region of Mrk 273 taken with OSIRIS and NIRC2 on the Keck II Telescope with laser guide star adaptive optics. We observe three spatially resolved components, and analyze the nuclear molecular and ionized gas emission lines and their kinematics. We confirm the presence of the hard X-ray AGN in the southwest nucleus. In the north nucleus, we find a strongly rotating gas disk whose kinematics indicate a central black hole of mass 1.04 ± 0.1 × 10^9 M_☉. The H_2 emission line shows an increase in velocity dispersion along the minor axis in both directions, and an increased flux with negative velocities in the southeast direction; this provides direct evidence for a collimated molecular outflow along the axis of rotation of the disk. The third spatially distinct component appears to the southeast, 640 and 750 pc from the north and southwest nuclei, respectively. This component is faint in continuum emission but shows several strong emission line features, including [Si VI] 1.964 μm which traces an extended coronal-line region. The geometry of the [Si VI] emission combined with shock models and energy arguments suggest that [Si VI] in the southeast component must be at least partly ionized by the SW AGN or a putative AGN in the northern disk, either through photoionization or through shock-heating from strong AGN- and circumnuclear-starburst-driven outflows. This lends support to a scenario in which Mrk 273 may be a dual AGN system.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
U, Vivian0000-0002-1912-0024
Medling, Anne0000-0001-7421-2944
Sanders, David0000-0002-1233-9998
Max, Claire0000-0003-0682-5436
Armus, Lee0000-0003-3498-2973
Iwasawa, Kazushi0000-0002-4923-3281
Evans, Aaron0000-0003-2638-1334
Kewley, Lisa0000-0001-8152-3943
Fazio, Giovanni0000-0002-0670-0708
Additional Information:© 2013 American Astronomical Society. Received 2012 August 29; accepted 2013 July 17; published 2013 September 13. We thank the anonymous referee for a helpful discussion on alternative cases for photoionizing the SE component, and for various suggestions on strengthening the scenarios put forth in the paper. We acknowledge H. Inami and S. Stierwalt for providing their Spitzer-IRS spectra toward ease of target selection for our observing program, M. Ammons for help with data reduction and PSF estimation, R. da Silva for help with CLOUDY and shock-plot modeling, and D. Rupke for helpful conversations toward the results and their interpretations. We also thank the Keck staff for help with carrying out the observations and the UH/UC TACs for granting this observing time. The data presented herein were obtained at the W.M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Mauna Kea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain. V.U. acknowledges funding support from the NASA Harriet G. Jenkins Predoctoral Fellowship Project and the Smithsonian Astrophysical Observatory Predoctoral Fellowship. A.M. acknowledges funding support from the NSF Graduate Fellowship. K.I. thanks support from Spanish Ministerio de Ciencia e Innovaciόn (MICINN) through grant (AYA2010-21782-C03-01). This work is partially supported by the JPL Contract/IRAC GTO Grant No. 1256790. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
W. M. Keck FoundationUNSPECIFIED
NASA Harriet G. Jenkins Predoctoral FellowshipUNSPECIFIED
Smithsonian Astrophysical ObservatoryUNSPECIFIED
NSF Graduate FellowshipUNSPECIFIED
Ministerio de Ciencia e Innovación (MCINN)AYA2010-21782-C03-01
Subject Keywords:galaxies: active; galaxies: individual (Mrk 273); galaxies: interactions; galaxies: kinematics and dynamics; galaxies: nuclei
Issue or Number:2
Record Number:CaltechAUTHORS:20131025-100306216
Persistent URL:
Official Citation:The Inner Kiloparsec of Mrk 273 with Keck Adaptive Optics Vivian U et al. 2013 ApJ 775 115
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42062
Deposited By: Ruth Sustaita
Deposited On:25 Oct 2013 17:26
Last Modified:10 Nov 2021 04:37

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