Temperature and density structure of the collapsing core of G10. 6-0. 4

Journal Article · Wed Jul 01 04:00:00 EDT 1987 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/165405· OSTI ID:6147729

Keto, E R; Ho, P T.P.; Haschick, A D

High-resolution aperture synthesis observations of the molecular gas surrounding the ultracompact H II region G10.6-0.4 in the (J,K) = (1,1) and (J,K) = (3,3) inversion lines of NH3 are reported. The ultracompact region is embedded in a dense molecular core whose average n(H2) density over the central 0.1 pc is 4 x 10 to the 6th/cu cm. The H II region is heating the molecular gas. Temperatures in the central 0.1 pc are in the range 95-140 K and scale outward as 1/sq rt R. The molecular core appears to be gravitationally collapsing onto the ultracompact H II region. Rotational gradient measurements suggest that between 1.5 and 0.35 pc the dynamics is consistent with Keplerian rotation and the mass distribution estimated from maps of the column density. 24 references.

• Research Organization: Harvard Univ., Boston, MA; Harvard-Smithsonian Center for Astrophysics, Cambridge, MA; Haystack Observatory, Westford, MA
• OSTI ID: 6147729
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 318; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMMONIA
COSMIC GASES
COSMIC RADIO SOURCES
DISTRIBUTION
FLUIDS
GASES
GRAVITATIONAL COLLAPSE
H2 REGIONS
HEATING
HYDRIDES
HYDROGEN COMPOUNDS
MASS DISTRIBUTION
MOLECULES
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
RED SHIFT
SPATIAL DISTRIBUTION
STAR EVOLUTION
TEMPERATURE DISTRIBUTION