NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-25 T06:52:50 PDT
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For refcode 2002A&A...389..374R:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2002A&A...389..374R An ISO-SWS survey of molecular hydrogen in starburst and Seyfert galaxies D. Rigopoulou, D. Kunze, D. Lutz, R. Genzel and A. F. M. Moorwood Max-Planck-Institut fur extraterrestrische Physik, Postfach 1312, 85741 Garching bei Munchen, Germany European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching bei Munchen, Germany Received 12 November 2001/Accepted 15 April 2002 Abstract. We present results from a survey of molecular hydrogen emission from a sample of Starburst and Seyfert galaxies carried out with the Infrared Space Observatory (ISO). Pure rotational H_2_ emission has been detected in a number of extragalactic objects and a variety of environments. A number of transitions from S(7) to S(0) are detected in both starbursts and Seyferts. Using excitation diagrams we derive temperatures and masses of the "warm" molecular hydrogen. We find that the temperature of the "warm" gas is similar in starbursts and Seyferts (those Seyferts for which we have firm detections of the S(0) line) with a value of around T ~ 150 K. This "warm" gas accounts for as much as 10% of the total galactic mass (as probed by CO molecular observations) in starbursts. The fraction of "warm" gas is overall higher in Seyferts, ranging between 2-35%. We then investigate the origin of the warm H 2 emission. Comparison with published theoretical models and Galactic templates implies that although emission from photodissociation regions (PDR) alone could explain the emission from starbursts and Seyferts, most likely a combination of PDR, shock emission and gas heated by X-rays (mostly for the Seyferts) is responsible for H_2_ excitation in extragalactic environments. Finally, we find that although PAH and H_2_ line emission correlate well in starbursts and the large scale emission in AGN, H_2_ emission is much stronger compared to PAH emission in cases where a "pure" AGN dominates the energy output. Key words: galaxies: active - galaxies: starburst - infrared: galaxies
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