Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ap%26ss.276..815p&link_type=abstract
Astrophysics and Space Science, v. 276, Issue 2/4, p. 815-821 (2001).
Astronomy and Astrophysics
Astrophysics
Scientific paper
A linear correlation between the ratio of the [CII(P -->P)] line intensity to the [^12CO(J:1 -->0)] line emission, I/I and the H_α equivalent width (EW) is found, 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 ISOLWS, plus nine late-type 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 I/I to be a reliable tracer of the current mass-normalized global SFR for non-starburst spiral galaxies. Moreover, the ratio of the [CII] line to the total far-infrared (FIR) continuum intensity, I/I, is found to decrease from ~0.5% to ~0.1% with decreasing SFR which we propose is due to a `[CII]-quiet' component of I from dust heated by the general interstellar radiation field (ISRF). The more `quiescent' galaxies in the sample have values of I/I different from those observed in `compact' Galactic interstellar regions. 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 J.
Pierini Daniel
Tuffs Richard. J.
Völk Heinrich J.
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