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High-velocity neon line emission from the ULGRIG IRAS F00183-7111 : revealing the optically obscured base of a nuclear outflow

Spoon, H. W. W. and Armus, L. and Marshall, J. A. and Bernard-Salas, J. and Farrah, D. and Charmandaris, V. and Kent, B. R. (2009) High-velocity neon line emission from the ULGRIG IRAS F00183-7111 : revealing the optically obscured base of a nuclear outflow. Astrophysical Journal, 693 (2). pp. 1223-1235. ISSN 0004-637X. https://resolver.caltech.edu/CaltechAUTHORS:20090413-131434849

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Abstract

We report the first mid-infrared detection of highly disturbed ionized gas in the ultraluminous infrared galaxy (ULIRG) IRAS F00183-7111. The gas, traced by the 12.81 μm [Ne II] and 15.56 μm [Ne III] lines, spans a velocity range of-3500 to +3000 km s^(–1) with respect to systemic velocity. Optical and near-infrared spectroscopic studies show no evidence for similarly high velocity gas components in forbidden lines at shorter wavelengths. We interpret this as the result of strong extinction (AV = 10-50) on the high-velocity gas, which identifies the base of the outflow traced in 5007 Å [O III] as a plausible origin. Unusual excitation conditions are implied by a comparison of the mid-infrared low-excitation neon line emission and the polycyclic aromatic hydrocarbon (PAH) emission for a sample of 56 ULIRGs. For IRAS F00183-7111, the neon/PAH ratio is 8 times higher than the average ratio. Similar mid-infrared kinematic and excitation characteristics are found for only two other ULIRGs in our sample: IRAS 12127-1412NE and IRAS 13451+1232. Both sources have an elevated neon/PAH ratio and exhibit pronounced blue wings in their 15.56 μm [Ne III] line profiles. IRAS 13451+1232 even shows a strongly blueshifted and broad 14.32 μm [Ne V] line. While for IRAS 13451+1232 the observed [Ne III]/[Ne II] and [Ne V]/[Ne II] line ratios indicate exposure of the blueshifted gas to direct radiation from the AGN, for IRAS F00183-7111 and IRAS 12127-1412NE the neon line ratios are consistent with an origin in fast shocks in a high-density environment, and with an evolutionary scenario in which strongly blueshifted [Ne II] and [Ne III] emission trace the (partial) disruption of the obscuring medium around a buried AGN. The detection of strongly blueshifted [Ne V] emission in IRAS 13451+1232 would then indicate this process to be much further advanced in this ULIRG than in IRAS F00183-7111 and IRAS 12127-1412NE, where this line is undetected.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-637X/693/2/1223DOIArticle
ORCID:
AuthorORCID
Spoon, H. W. W.0000-0002-8712-369X
Armus, L.0000-0003-3498-2973
Marshall, J. A.0000-0001-7712-8465
Bernard-Salas, J.0000-0002-8452-8675
Farrah, D.0000-0003-1748-2010
Charmandaris, V.0000-0002-2688-1956
Additional Information:© 2009 The American Astronomical Society. Received 2008 March 19; accepted 2008 November 8; published 2009 March 6. The authors thank Jan Cami, Helmut Dannerbauer, Brent Groves, Lei Hao, Timothy Heckman, Lisa Kewley, Dieter Lutz, and Xander Tielens for discussions, Catherine Buchanan, Joanna Holt, and Sylvain Veilleux for sharing their published spectra, and Mark G. Allen for providing MAPPINGS shock models ahead of publication.We also thank the slowbut dilligent referee for comments which helped to strengthen the paper. Support for this work was provided by NASA. This research has made extensive use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
NASAUNSPECIFIED
Subject Keywords:infrared: ISM; ISM: jets and outflows; galaxies: active; galaxies: individual (IRAS F00183-7111, IRAS 12127-1412, IRAS 13451+1232); galaxies: ISM
Issue or Number:2
Record Number:CaltechAUTHORS:20090413-131434849
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20090413-131434849
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13954
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:04 Aug 2009 23:03
Last Modified:22 Dec 2020 00:31

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