Small-scale structure and chemical differentiation in the central region of the Sagittarius B2 molecular cloud

Journal Article · Sun Mar 01 00:00:00 EST 1987 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/165083· OSTI ID:6167007

Goldsmith, P F; Snell, R L; Hasegawa, T; Ukita, N

Fifteen arcsec angular resolution observations of a number of molecular species in the center of the Sgr B2 molecular cloud, including HC3N in the ground and v7 = 1 vibrational states, SO, OCS,l and HNCO, have been performed. Emission from HC3N is fairly uniformly distributed over the region studied; SO and OCS have a spatially extended component but are strongly centrally peaked. HNCO and vibrationally excited HC/sub 3/N emission are essentially restricted to a very small region around the center of activity in the north. The difference between the spatial distributions are attributed to variation in the chemical abundances of the various clumps. The excitation requirements of the vibrationally excited HC/sub 3/N imply the presence of dust and gas at high temperatures. The results further heighten the apparent contradiction presented by the lack of infrared emission from this source. 53 references.

• Research Organization: Five College Radio Astronomy Observatory, Amherst, MA; Nobeyama Radio Observatory, Minamimaki, Japan
• OSTI ID: 6167007
• Journal Information: Astrophys. J.; (United States), Vol. 314
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARBON OXYSULFIDE
COSMOCHEMISTRY
INTERSTELLAR SPACE
CHEMICAL COMPOSITION
ISOCYANIC ACID
PROPIOLONITRILE
SULFUR OXIDES
COSMIC GASES
EMISSION SPECTRA
MILKY WAY
MOLECULES
NEBULAE
CARBON COMPOUNDS
CARBONIC ACID DERIVATIVES
CHALCOGENIDES
CHEMISTRY
FLUIDS
GALAXIES
GASES
NITRILES
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
SPACE
SPECTRA
SULFUR COMPOUNDS
640105* - Astrophysics & Cosmology- Galaxies