Computer Science
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..949p&link_type=abstract
The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 949
Computer Science
Galaxies, Interstellar Medium, Star-Formation, Infrared
Scientific paper
We demonstrate the existence of a linear correlation between the ratio of the [CII(2 P3/2 -->2 P1/2)] (λ 158 μ m) fine structure cooling line intensity to the [12CO(J:1 --> 0)] (λ 2.6 mm) line emission, ICII/ICO, and the H α (λ 6563 Å) equivalent width (EW), over the range 2-71 Å in H α EW, for a sample of 21 late-type galaxies. The latter is comprised of an optically selected sample of 12 normal Virgo cluster spiral galaxies with [CII] detections obtained by us with LWS onboard ISO, plus 9 galaxies with higher star-formation rates (SFRs), for which [CII] data and, especially, H α EW data are available in the literature. As a result we infer ICII/ICO to be a reliable diagnostic of the current normalized global SFR for non-starburst spiral galaxies. Moreover we find that the ratio of the [CII] line to the total far-infrared (FIR) continuum intensity, ICII/IFIR, decreases from ~ 0.5% to ~ 0.1% with decreasing SFR which we propose is due to a ``[CII]-quiet'' component of IFIR from dust heated by the general interstellar radiation field (ISRF). The more ``quiescent'' galaxies in the sample have ICII/ICO different from those observed in ``compact'' Galactic interstellar regions. Therefore their [CII]-emission is interpreted to be dominated by diffuse regions of the Interstellar Medium (ISM). For normal ``star forming'' galaxies the diffuse component of the [CII]-emission is estimated to account for at least 50% of the total.
Leech Kieron
Pierini Daniel
Tuffs Richard. J.
Völk Heinrich J.
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