Formaldehyde in the Orion molecular flow - Evidence for a gentle acceleration

Details Formaldehyde in the Orion molecular flow - Evidence for a gentle acceleration Formaldehyde in the Orion molecular flow - Evidence for a gentle acceleration

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...277..189w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 277, Feb. 1, 1984, p. 189-195. Research supported by the Rensselaer Polytec

Astronomy and Astrophysics

Astrophysics

22

Abundance, Formaldehyde, Infrared Spectra, Infrared Stars, Interstellar Matter, Molecular Clouds, Flow Velocity, Gas Flow, Orion Constellation

Scientific paper

High-velocity gas (50 km/s) has been observed in six transitions of formaldehyde toward the Orion infrared cluster. The region of the cluster has been mapped in the higher frequency transitions. The low-velocity emission probably arises from an ensemble of dense (10 to the 7th to 10 to the 8th) clumps. A similar density is required to reproduce the observed excitation of the high-velocity emission. The abundance of formaldehyde in the high-velocity gas /X(H2CO) of about 10 to the -9th/ is similar to the abundance in the ambient cloud and about an order of magnitude higher than that in the 'hot core'. Chemical reactions at the high temperatures expected from direct heating of the H2CO by a passing shock should drastically lower its abundance. The survival of high-velocity formaldehyde requires acceleration of only modestly heated (i.e., less than 400 K) cloud material, perhaps in the form of clumps similar to those producing the low-velocity emission.

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