The [CII] and [OI] emission lines in NGC6946 and NGC1313

The [CII] and [OI] emission lines in NGC6946 and NGC1313

The [CII (158 μm)] fine structure line, which is the principal cooling line of the atomic gas, in two nearby galaxies observed with LWS on board ISO is compared to dust and HI gas emission and heating intensity. The relation between photoelectric effect on different grains populations, dust and gas...

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Veröffentlicht in:Astrophysics and space science 2001-05, Vol.277 (1), p.59-62
Hauptverfasser: Contursi, A, Brauher, J, Helou, G
Format: Artikel
Sprache:eng
Schlagworte:
Astrophysics
Cooling
Dust
Emissions
Gases
Heating
Stars & galaxies
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Zusammenfassung:The [CII (158 μm)] fine structure line, which is the principal cooling line of the atomic gas, in two nearby galaxies observed with LWS on board ISO is compared to dust and HI gas emission and heating intensity. The relation between photoelectric effect on different grains populations, dust and gas heating found for a sample of 60 normal galaxies for which global [CII] measurements are available, still holds on scale of 1.5 kpc. We also succeed in detecting cooling from a low density diffuse atomic gas associated with the diffuse optical disk in both galaxies, accounting typically for 30-40% of the total [CII] emission.[PUBLICATION ABSTRACT]
ISSN:0004-640X
1572-946X
DOI:10.1023/A:1012771409683