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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 559373.0, MPI für Astronomie / Publikationen_mpia
Jet-powered molecular hydrogen emission from radio galaxies
Authors:Ogle, Patrick; Boulanger, Francois; Guillard, Pierre; Evans, Daniel A.; Antonucci, Robert; Appleton, P. N.; Nesvadba, Nicole; Leipski, Christian
Date of Publication (YYYY-MM-DD):2010
Title of Journal:The Astrophysical Journal
Journal Abbrev.:The Astrophysical Journal
Volume:724
Issue / Number:2
Start Page:1193
End Page:1217
Review Status:not specified
Audience:Experts Only
Abstract / Description:H2 pure-rotational emission lines are detected from warm (100-1500 K) molecular gas in 17/55 (31% of) radio galaxies at redshift z < 0.22 observed with the Spitzer IR Spectrograph. The summed H2 0-0 S(0)-S(3) line luminosities are L(H2) = 7 × 1038-2 × 1042 erg s-1, yielding warm H2 masses up to 2 × 1010 M sun. These radio galaxies, of both FR radio morphological types, help to firmly establish the new class of radio-selected molecular hydrogen emission galaxies (radio MOHEGs). MOHEGs have extremely large H2 to 7.7 μm polycyclic aromatic hydrocarbon (PAH) emission ratios: L(H2)/L(PAH7.7) = 0.04-4, up to a factor 300 greater than the median value for normal star-forming galaxies. In spite of large H2 masses, MOHEGs appear to be inefficient at forming stars, perhaps because the molecular gas is kinematically unsettled and turbulent. Low-luminosity mid-IR continuum emission together with low-ionization emission line spectra indicates low-luminosity active galactic nuclei (AGNs) in all but three radio MOHEGs. The AGN X-ray emission measured with Chandra is not luminous enough to power the H2 emission from MOHEGs. Nearly all radio MOHEGs belong to clusters or close pairs, including four cool-core clusters (Perseus, Hydra, A2052, and A2199). We suggest that the H2 in radio MOHEGs is delivered in galaxy collisions or cooling flows, then heated by radio-jet feedback in the form of kinetic energy dissipation by shocks or cosmic rays.
Free Keywords:galaxies: active; galaxies: ISM; galaxies: jets; infrared: galaxies; quasars: general
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2010ApJ...724.1193O [ID No:1]
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