A survey of molecular hydrogen in the central galaxies of cooling flows期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

按检索

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

Authors:	A C Edge R J Wilman R M Johnstone C S Crawford A C Fabian S W Allen

Institution:	Department of Physics, University of Durham, Durham, DH1 7LE;Institute of Astronomy, Madingley Road, Cambridge CB3 0HA;Leiden Observatory, PO Box 9513, 2300 RA Leiden, the Netherlands

Abstract:	We present a large sample of H - and K -band spectra of 32 optically line-luminous central cluster galaxies. We find significant rovibrational H₂ 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.

Keywords:	galaxies: active galaxies: clusters: general cooling flows galaxies: elliptical and lenticular cD infrared: galaxies