Observations of interstellar silicon monoxide

Journal Article · Sat May 15 04:00:00 EDT 1976 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/154357· OSTI ID:7268628

Dickinson, D F; Gottlieb, C A; Gottlieb, E W; Litvak, M M

We report observations of rotational transitions of SiO in the ground vibrational state at 86.8 GHz (J=2..-->..1) and 130.3 GHz (J=3..-->..2). At 86.8 GHz, SiO emission in Orion A peaks in the direction of the Kleinmann-Low nebula. A possible secondary maximum occurs about 80'' southward. The 130.3 GHz line was also detected in Orion A. Mapping of the 86.8 GHz line in Sgr B2 shows the presence of two velocity components and a north-south extent of about 4'. Comparison of the data with radiative-transport calculations implies that if the hydrogen density is approximately 10/sup 5/ cm/sup -3/ then the SiO column density is approximately 10/sup 15/ cm/sup -2/ for Orion A at 60 K.Upper limits to the total HO/sub 2/ column density in Orion A and Sgr B2 are reported. (AIP)

• Research Organization: Center for Astrophysics, Harvard College Observatory
• OSTI ID: 7268628
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 206:1; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CHALCOGENIDES
CHEMICAL COMPOSITION
CRYOGENIC FLUIDS
DENSITY
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY LEVELS
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
FLUIDS
HEAT TRANSFER
HYDROGEN
INTERSTELLAR SPACE
NEBULAE
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIANT HEAT TRANSFER
RADIATIONS
RADIOWAVE RADIATION
ROTATIONAL STATES
SILICON COMPOUNDS
SILICON OXIDES
SPACE
VELOCITY
VIBRATIONAL STATES