H2CO maps of high-density molecular fragments 3 arcmin north of Orion-KL

Journal Article · Mon May 01 04:00:00 EDT 1989 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/167442· OSTI ID:5642979

Wilson, T L; Johnston, K J ^[1]

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1. Max-Planck-Institut fuer Radioastronomie, Bonn (Germany, F.R.)

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. 22 refs.

• OSTI ID: 5642979
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 340; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
ALDEHYDES
COSMIC GASES
DENSITY
DISTRIBUTION
ELEMENTS
EMISSION SPECTRA
FLUIDS
FORMALDEHYDE
GASES
HYDROGEN
INTERSTELLAR SPACE
MAPS
MASS
MASS DISTRIBUTION
MOLECULES
MORPHOLOGY
MOTION
NEBULAE
NONMETALS
ORGANIC COMPOUNDS
ORIGIN
PHYSICAL PROPERTIES
RADIAL VELOCITY
ROTATION
SPACE
SPATIAL DISTRIBUTION
SPECTRA
VELOCITY