H2CO survey in the galactic center - L = 0.5-4.0 deg

Details H2CO survey in the galactic center - L = 0.5-4.0 deg H2CO survey in the galactic center - L = 0.5-4.0 deg

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26as...96..525z&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 96, no. 3, p. 525-547.

Astronomy and Astrophysics

Astrophysics

15

Absorption Spectra, Formaldehyde, Galactic Nuclei, Interstellar Gas, Molecular Clouds, Data Reduction, Optical Thickness

Scientific paper

The galactic center (l = 0.5-4.0 deg) has been mapped in the H2CO (1(10)-1(11); 4.83 GHz) absorption line with the MPIfR 100-m telescope. The survey extends earlier formaldehyde measurements to higher galactic longitudes, and complements recent (C-13)O and CS emission line data taken with comparable resolution. Along selected strips in l and b additional measurements have been carried out in the H2CO (2(11)-2(12); 14.5 GHz) transition with the NRAO 140-ft telescope; a comparison between the two transitions provides direct access to the clouds' H2 density. The data are presented in the form of position-velocity diagrams and channel maps of integrated main beam brightness temperatures and apparent optical depths. A special discussion is devoted to the outstanding cloud association at l about 3.2 deg ('clump 2'), which is decomposed into a number of kinematically well-defined sub-clouds.

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