Computer Science
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..909k&link_type=abstract
The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 909
Computer Science
2
Interstellar Medium, Molecular Hydrogen, Starburst Galaxies, Seyfert Galaxies, Infrared Galaxies
Scientific paper
We present a survey of molecular hydrogen line emission in nearby starburst and Seyfert galaxies. Excitation temperatures and gas masses for low-lying energy levels of H2 are derived from the observed pure rotational lines. The H2 (0-0) S(1) line in Seyferts is emitted by a ``warm'' gas at temperature of 120-140 K. This component accounts for 0.2-20 per cent of the total gas content. In starbursts the temperature of the S(1) emitting gas is somewhat higher (up to 210 K) and contributes typically a few per cent to the total gas mass (up to 9 per cent in M 82). The S(5) and S(7) lines trace a ``hotter'' gas component at temperatures of about 1100 K (up to 1700 K in IC 342) both in Seyfert and starburst galaxies. The excitation of the molecular hydrogen in starbursts and some of the Seyfert galaxies is dominated by UV-fluorescence. However it cannot be excluded that a part of the ``warm'' H2 gas is thermally excited. For some of the Seyferts indications for shock excitation are found.
Genzel Reinhard
Kunze D.
Lutz Dieter
Rigopoulou Dimitra
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