Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...317..907s&link_type=abstract
Astronomy and Astrophysics, v.317, p.907-910
Astronomy and Astrophysics
Astrophysics
4
Ism: Abundances, Molecules, Ism: Draco Cloud = G 90+39, Radio Lines: Ism
Scientific paper
We report the detection of the CH ^2Pi_1/2_, J=1/2 ground-state hyperfine transitions at 3.3 GHz in the inter-mediate-velocity cloud G90+39(Draco). The lines were measured with the Effelsberg 100m radio telescope and their main-line strength varies between T_MB_=~0.04-0.06K. The emission is found to be optically thin and the derived CH column density ranges between (1-4)x10^13^cm^-2^. The CH column density as well as the derived dust-to-gas ratio indicate that the Draco cloud resembles the translucent high-latitude clouds at local velocities. The measurements are used to calculate the molecular hydrogen column density using the theoretically determined linear relation between N(CH) and N(H_2_). We find N(H_2_)=~4x10^20^-1x10^21^cm^-2^. These values are about a factor five higher than the ones found via the empirical CO/H_2_ conversion ratio of Herbstmeier et al. (1993A&A...272..514H).
Guesten Rolf
Kalberla Peter
Stark Ronald
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