Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...284..403b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 284, no. 2, p. 403-410
Astronomy and Astrophysics
Astrophysics
22
Abundance, Carbon Monoxide, Dwarf Galaxies, Hydrogen, Interstellar Gas, Line Spectra, Starburst Galaxies, Astronomical Maps, Infrared Spectra, Molecular Gases, Radio Spectra
Scientific paper
The starburst dwarf galaxy He 2-10 has been partially mapped in the H2 (1-0) S1 line, and in the (12)CO 3 to 2, 2 to 1 and 1 to 0 transitions. The (13)CO lines for these transitions have also been measured at the center position. The observations show that the H2 line is most likely shock excited, while the CO measurements indicate the presence of both cold (Tex less than 10 K) and hot (Tex greater than 50 K) molecular gas. The hot molecular gas must be optically thin in all three (12)CO transitions, and have a ((12)CO)/((13)CO) isotopic abundance ratio of about 30. The cold J = 1-0 emission is either optically thin with a similar isotopic abundance ratio, or optically thick with an anomalously high ((12)CO)/((13)CO) ratio greater than 100. Estimates for the total molecular gas mass and the dust mass are derived and compared with those of NGC 1569 and IIZw40. The starburst process appears to proceed in a similar manner in all three galaxies.
Baas F.
Israel Frank P.
Koornneef Jan
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