Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...196.6305b&link_type=abstract
American Astronomical Society, 196th AAS Meeting, #63.05; Bulletin of the American Astronomical Society, Vol. 32, p.1286
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Observations of far-infrared emission lines can be used to infer the physical conditions of the ISM in galaxies. We describe a sample of 200 galaxies observed with the ISO Long Wavelength Spectrometer (43-197 μ m), extracted from the ISO Data Archive and reduced in a systematic and uniform fashion with the ISOLWS Interactive Analysis software. This sample spans a range of morphologies, star formation rates, and UV heating intensities (0.1 <= F60μ m/F100μ m <= 1.4). [CII] 158μ m and [OI] 63μ m are observed in emission for a majority of this sample and arise from PDR regions. We examine [CII]/FIR, [OI]/[CII], and ([OI]+[CII])/FIR over the range of morphologies and FUV radiation fields. The [CII]/FIR ratio is seen to peak around F60μ m/F100μ m = 0.4-0.5 and decrease in more active (F60μ m >= 0.5) and quiescent (F60μ m <= 0.4) galaxies. As [CII] emission becomes deficient in active galaxies, [OI] begins to dominate the cooling at F60μ m/F100μ m>0.7 in the hot, dense PDR regime.
Brauher James
Lord Steve
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