Dust and gas emission in Barnard 5

Journal Article · Wed Feb 01 04:00:00 EST 1989 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/167108· OSTI ID:6199772

Langer, W D; Wilson, R W; Goldsmith, P F; Beichman, C A

The relationships among IR emission, CO isotope intensities, and visual extinction in the molecular cloud Barnard 5 are studied in order to evaluate various candidates as mass tracers or molecular material and to determine the properties of dust grains emitting at 60 and 100 microns. The results establish a strong correlation between the 100 micron dust opacity and the (C-13)O column density. This relationship should allow for tracing the molecular gas with the 100 and 60 micron emission in regions without strong embedded heat sources. For single homogeneous clouds, (C-13)O is the best CO tracer of mass and gives the best estimate of virial mass. The mass of B5 estimated from the (C-13)O luminosity is 930 solar masses, while that of the core and dense fragments is only 200 solar masses. An algorithm is developed for calculating the virial mass of a cloud based on observation of optically thin lines. 65 references.

• Research Organization: ATandT Bell Laboratories, Holmdel, NJ (USA); Massachusetts Univ., Amherst (USA); California Institute of Technology, Pasadena (USA)
• OSTI ID: 6199772
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 337; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION
ALGORITHMS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
COSMIC DUST
COSMIC GASES
DENSITY
DUSTS
ELECTROMAGNETIC RADIATION
FLUIDS
GASES
INFRARED RADIATION
INTERSTELLAR SPACE
ISOTOPE APPLICATIONS
ISOTOPES
MAPS
MASS
MATHEMATICAL LOGIC
MOLECULES
NEBULAE
OPACITY
OPTICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIATIONS
SPACE
TRACER TECHNIQUES