期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 337, 期 1, 页码 49-62出版社
BLACKWELL PUBLISHING LTD
DOI: 10.1046/j.1365-8711.2002.05790.x
关键词
galaxies : active; galaxies : clusters : general; cooling flows; galaxies : elliptical and lenticular, cD; infrared : galaxies
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 [Fe II] emission in another five. 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 [Si VI] emission that appears to correlate with the strength of high ionization lines in the optical (e.g. [O III]). This comprehensive sample builds on previous work and confirms that warm (1000-2500 K) 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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