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A survey of molecular hydrogen in the central galaxies of cooling flows

  • Edge, A. C.
  • Wilman, R. J.
  • Johnstone, R. M.
  • Crawford, C. S.
  • Fabian, A. C.
  • Allen, S. W.
Published Article
Publication Date
Jun 21, 2002
Submission Date
Jun 21, 2002
DOI: 10.1046/j.1365-8711.2002.05790.x
arXiv ID: astro-ph/0206379
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We present a large sample of H- and K-band spectra of 32 optically line luminous central cluster galaxies. We find significant rovibrational H_2 emission in 23 of these galaxies as well as H recombination and/or [FeII] emission in another 5. This represents a fourfold increase in the number of molecular line detections known. A number of the detections are of extended emission (5-20 kpc). In several objects we find significant [SiVI] emission that appears to correlate with the strength of high ionization lines in the optical (e.g. [OIII]). This comprehensive sample builds on previous work and confirms that warm (1000-2500K) molecular hydrogen is present wherever there is ionized material in the cores of cooling flows and in most cases it also coincides with CO molecular line emission.

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