High spatial resolution isotopic CO and CS observations of M17 SW - The clumpy structure of the molecular cloud core

Journal Article · Fri Jun 01 04:00:00 EDT 1990 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/168859· OSTI ID:6690360

Stutzki, J; Guesten, R ^[1]

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1. Max-Planck-Institut fuer Physik und Astrophysik, Garching (Germany, F.R.) Max-Planck-Institut fuer Radioastronomie, Bonn (Germany, F.R.)

This paper presents high-angular-resolution maps of the M17 SW cloud core in the C(O-18) J = 2-1 (13 arcsec FWHM beam) and C(S-34) J = 2-1 (27 arcsec FWHM), 3-2 (17 arcsec FWHM) lines obtained with the IRAM 30 m telescope. These maps directly reveal the clumpy structure of the entire cloud core down to linear scales of 13 arcsec and below. Individual clumps have line widths as small as 0.5 km/s, compared to a line width of 3-5 km/s observed with lower angular resolution in the same lines. The C(O-18) 2-1 line reaches a peak brightness temperature of 24 K in the 13-arcsec beam and is probably slightly optically thick in several locations. Spectra in the more abundant CO isotopes obtained toward several selected positions show strong self-absorption notches and peak brightness temperatures in between these notches of about 100 K. 65 refs.

• OSTI ID: 6690360
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 356; 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
BRIGHTNESS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
COSMIC GASES
ELEMENT ABUNDANCE
EMISSION SPECTRA
FLUIDS
GASES
INTERSTELLAR SPACE
LINE WIDTHS
MAPS
MOLECULES
MORPHOLOGY
NEBULAE
OPTICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RESOLUTION
SPACE
SPATIAL RESOLUTION
SPECTRA
SULFIDES
SULFUR COMPOUNDS