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Jet-ISM Interaction in the Radio Galaxy 3C 293: Jet-driven Shocks Heat ISM to Power X-Ray and Molecular H_2 Emission

Lanz, L. and Ogle, P. M. and Evans, D. and Appleton, P. N. and Guillard, P. and Emonts, B. (2015) Jet-ISM Interaction in the Radio Galaxy 3C 293: Jet-driven Shocks Heat ISM to Power X-Ray and Molecular H_2 Emission. Astrophysical Journal, 801 (1). Art. No. 17. ISSN 0004-637X.

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We present a 70 ks Chandra observation of the radio galaxy 3C 293. This galaxy belongs to the class of molecular hydrogen emission galaxies (MOHEGs) that have very luminous emission from warm molecular hydrogen. In radio galaxies, the molecular gas appears to be heated by jet-driven shocks, but exactly how this mechanism works is still poorly understood. With Chandra, we observe X-ray emission from the jets within the host galaxy and along the 100 kpc radio jets. We model the X-ray spectra of the nucleus, the inner jets, and the X-ray features along the extended radio jets. Both the nucleus and the inner jets show evidence of 10^7 K shock-heated gas. The kinetic power of the jets is more than sufficient to heat the X-ray emitting gas within the host galaxy. The thermal X-ray and warm H_2 luminosities of 3C 293 are similar, indicating similar masses of X-ray hot gas and warm molecular gas. This is consistent with a picture where both derive from a multiphase, shocked interstellar medium (ISM). We find that radio-loud MOHEGs that are not brightest cluster galaxies (BCGs), like 3C 293, typically have L_H_2/L_X ~ 1 and M_H_2/M_X ~ 1, whereas MOHEGs that are BCGs have L_H_2/L_X ~ 0.01 and M_H_2/M_X ~ 0.01. The more massive, virialized, hot atmosphere in BCGs overwhelms any direct X-ray emission from current jet-ISM interaction. On the other hand, L_H_2/L_X ~ 1 in the Spiderweb BCG at z = 2, which resides in an unvirialized protocluster and hosts a powerful radio source. Over time, jet-ISM interaction may contribute to the establishment of a hot atmosphere in BCGs and other massive elliptical galaxies.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Lanz, L.0000-0002-3249-8224
Ogle, P. M.0000-0002-3471-981X
Appleton, P. N.0000-0002-7607-8766
Guillard, P.0000-0002-2421-1350
Additional Information:© 2015 American Astronomical Society. Received 2014 October 14; accepted 2014 December 23; published 2015 February 26. L.L. thanks Aneta Siemiginowska and Katherine Alatalo for insightful discussions. We also thank Alvaro Labiano for sharing the CO data from his paper. Support for this work was provided by the National Aeronautics and Space Administration through Chandra Award Number GO1-12122X issued by the Chandra X-Ray Observatory Center, which is operated by the Smithsonian Astrophysical Observatory for and on behalf of the National Aeronautics Space Administration under contract NAS8-03060. The scientific results reported in this article are based on observations made by the Chandra X-Ray Observatory and data obtained from the Chandra Data Archive, some of which was published previously in cited articles. This work also used archival data obtained from the Spitzer Science Archive, the Mikulski Archive for Space Telescopes (MAST), and the NASA/IPAC Infrared Science Archive (IRSA). Spitzer is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. GALEX is operated for NASA by the California Institute of Technology under NASA contract NAS5-98034. This research has made use of the NASA/IPAC Extragalactic Database (NED), which along with IRSA, is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. B.E. acknowledges funding through the European Union FP7 IEF grant No. 624351.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Marie Curie Fellowship624351
Subject Keywords:galaxies: active; galaxies: individual (3C 293); galaxies: ISM; galaxies: jets; X-rays: galaxies; X-rays: ISM
Issue or Number:1
Record Number:CaltechAUTHORS:20150403-131921041
Persistent URL:
Official Citation:Jet-ISM Interaction in the Radio Galaxy 3C 293: Jet-driven Shocks Heat ISM to Power X-Ray and Molecular H2 Emission L. Lanz et al. 2015 ApJ 801 17
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56349
Deposited By: Ruth Sustaita
Deposited On:04 Apr 2015 01:49
Last Modified:09 Mar 2020 13:18

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