Dispersal of dense protostellar material - NH3 hot cores and outflows in Sagittarius B2

Journal Article · Fri May 01 00:00:00 EDT 1987 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/165196· OSTI ID:6270340

Vogel, S N; Genzel, R; Palmer, P

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), Vol. 316
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
PROTOSTARS
GAS FLOW
AMMONIA
DENSITY
EMISSION SPECTRA
H2 REGIONS
MASERS
MASS
MILKY WAY
MOLECULES
STAR EVOLUTION
AMPLIFIERS
COSMIC RADIO SOURCES
ELECTRONIC EQUIPMENT
EQUIPMENT
FLUID FLOW
GALAXIES
HYDRIDES
HYDROGEN COMPOUNDS
MICROWAVE AMPLIFIERS
MICROWAVE EQUIPMENT
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
PHYSICAL PROPERTIES
SPECTRA
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources