NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-26 T00:59:56 PDT
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For refcode 2001MNRAS.324..443J:
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Copyright by Royal Astronomical Society. 2001MNRAS.324..443J Infrared spectra of cooling flow galaxies W. Jaffe, M. N. Bremer and P. P. van der Werf Accepted 2001 January 5. Received 2000 December 20; in original form 2000 May 18 ABSTRACT We have taken K-band spectra covering seven cooling flow clusters. The spectra show many of the 1-0S transitions of molecular hydrogen, as well as some of the higher vibrational transitions, and some lines of ionized hydrogen. The line ratios allow us to conclude that the rotational states of the first excited vibrational state are in approximate local thermodynamic equilibrium (LTE), so that densities above 105 cm-3 are likely, but there is evidence that the higher vibrational states are not in LTE. The lack of pressure balance between the molecular gas and the ionized components emphasizes the need for dynamic models of the gas. The ratios of the ionized to molecular lines are relatively constant but lower than from starburst regions, indicating that alternative heating mechanisms are necessary. Keywords: dust, extinction - ISM: molecules - cooling flows - infrared: galaxies
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