Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...340..894w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 340, May 15, 1989, p. 894-899. Research supported by the Alexander von Humb
Astronomy and Astrophysics
Astrophysics
14
Formaldehyde, Fragments, Molecular Clouds, Orion Nebula, Abundance, Emission Spectra, Spatial Distribution, Very Large Array (Vla)
Scientific paper
VLA maps of OMC-N, the molecular region 3 arcmin north of Orion-KL in the 2 cm K-doublet line of formaldehyde, resolve this region into six high-density fragments having radial velocities ranging from 9 to 10 km/sec and FWHP of 0.4 to 5 km/sec. Virial estimates give H2 densities ranging from 8 x 10 to the 5th/cu cm to 3 x 10 to the 7th/cu cm and masses from 1 solar mass to 150 solar masses. There is good agreement between the positions of two of these fragments and the clumps detected in the (J, K) = (2, 2) line of ammonia, but there is no hint of the rotation reported. On scales of 2 arcmin, four of the regions fall along a line with the same position angle found from lower resolution maps of ammonia and CO; on scales of about 20 arcsec, this alignment breaks down. The origin and evolution of these fragments is discussed.
Johnston Ken J.
Wilson Thomas L.
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