Formaldehyde and OH in the Orion molecular clouds

Details Formaldehyde and OH in the Orion molecular clouds Formaldehyde and OH in the Orion molecular clouds

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.203.1123c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 203, June 1983, p. 1123-1135.

Astronomy and Astrophysics

Astronomy

24

Formaldehyde, Hydroxyl Emission, Molecular Clouds, Orion Nebula, Radio Astronomy, Thermal Emission, Astronomical Maps, Gas Density, Interstellar Gas, Line Spectra

Scientific paper

Formaldehyde 6-cm absorption has been mapped in the Orion region using the Jodrell Bank MK II radio telescope. The measurements cover the Lynds dust clouds L1630, 1641 and part of 1647. Maps are presented of the formaldehyde line intensity and velocity over the region. The formaldehyde 6-cm line is found to be a good tracer of total gas density. The mass of molecular hydrogen implied by these measurements is 20,000 solar masses for L1630 and 50,000 solar masses for L1641 and 1647. The largest concentrations within the clouds have masses far in excess of their virial masses and are probably collapsing. Measurements have also been made of thermal emission from OH at 1667 MHz. 24 positions were observed with the Jodrell Bank MK IA radio telescope. There is a good correlation between the OH and H2 CO line intensities.

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