Other
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21832108g&link_type=abstract
American Astronomical Society, AAS Meeting #218, #321.08; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
Spitzer spectroscopy has revealed a significant and diverse population of extragalactic sources where the mid-infrared rotational line emission of warm (> 150 K) molecular hydrogen (H2) is strongly enhanced, while star formation is suppressed. The multi-galaxy collision in Stephan's Quintet (SQ) is one example of these powerful H2 emitters. New CO line observations of the kpc-scale X-ray emitting shock associated with the collision will be presented. The CO gas is extremely turbulent, with FWHM up to 1000km/s, and the warm-to-cold H2 mass ratio is more than one order of magnitude higher than in star-forming galaxies. These observations provide insights into our understanding of how the mechanical energy of the galaxy collision is dissipated, and how this dissipation affects the passage from molecular gas to stars. This astrophysical process is relevant to many other active phases of galaxy evolution (AGN feedback, cooling flows, gas accretion, etc.) where a huge amount of mechanical energy is released in the ISM.
Appleton Phil N.
Boulanger Francois
Cluver Michelle
Duc P.
Falgarone Edith
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