Dispersal of dense protostellar material - NH3 hot cores and outflows in Sagittarius B2
Journal Article
·
· Astrophys. J.; (United States)
VLA observations of Sgr B2 in six ammonia transitions have uncovered two 200-K condensations with approximately 0.2 pc diameters associated with water maser sources which are similar to the Orion hot core but are more massive. Total NH3 mass of the northern source is 1000 times higher than in the Orion hot core. The hot core emission traces dense gas around newly formed massive stars, and is produced during a relatively brief stage after the star begins to heat the surrounding medium and before the dense gas is dispersed by outflow and the emergence of an expanding H II region. 36 references.
- Research Organization:
- California Univ., Berkeley; California Institute of Technology, Pasadena; Chicago Univ., IL
- OSTI ID:
- 6270340
- Journal Information:
- Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 316; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMMONIA
AMPLIFIERS
COSMIC RADIO SOURCES
DENSITY
ELECTRONIC EQUIPMENT
EMISSION SPECTRA
EQUIPMENT
FLUID FLOW
GALAXIES
GAS FLOW
H2 REGIONS
HYDRIDES
HYDROGEN COMPOUNDS
MASERS
MASS
MICROWAVE AMPLIFIERS
MICROWAVE EQUIPMENT
MILKY WAY
MOLECULES
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
PHYSICAL PROPERTIES
PROTOSTARS
SPECTRA
STAR EVOLUTION
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMMONIA
AMPLIFIERS
COSMIC RADIO SOURCES
DENSITY
ELECTRONIC EQUIPMENT
EMISSION SPECTRA
EQUIPMENT
FLUID FLOW
GALAXIES
GAS FLOW
H2 REGIONS
HYDRIDES
HYDROGEN COMPOUNDS
MASERS
MASS
MICROWAVE AMPLIFIERS
MICROWAVE EQUIPMENT
MILKY WAY
MOLECULES
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
PHYSICAL PROPERTIES
PROTOSTARS
SPECTRA
STAR EVOLUTION