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Title: CO survey of the dark nebulae in Taurus and Perseus

Abstract

The thesis reports a large-scale survey of carbon monoxide (/sup 12/CO) emission (at lambda = 2.6 mm) from dark nebulae in Taurus and Perseus. CO spectra at 4395 points were obtained within an area of about 800 square degrees generally west of the galactic anti-center. The spatial resolution of the instrument was eight arcminutes and velocity resolution was 2.6 km s/sup -1//. CO emission is strongest wherever extinction by dust is greatest, spilling over the apparent outer boundaries of the dust clouds observed optically. Combining CO velocity for the nebulae with optically determined distances shows that the clouds in the survey area form several layers. The molecular cloud mass closest to the sun is the Taurus and Auriga complex about 150 +/- 50 pc). Nearer to the Per )B2 OB association (at 350 +/- 100 pc) than the Taurus clouds are the Per OB2 molecular cloud (350 +/- 100 pc) and the California Nebula = NGC15979 molecular clouds (at 400 +/- 150 pc). Cloud masses were determined from integrated CO emission intensity alone by assuming that ..gamma..-ray emission intensities can be used to relate H/sub 2/ column densities to CO emission intensities.

Authors:
Publication Date:
Research Org.:
Columbia Univ., New York (USA)
OSTI Identifier:
7131199
Alternate Identifier(s):
OSTI ID: 7131199
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: Thesis (Ph. D.)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CARBON MONOXIDE; EMISSION SPECTRA; MILKY WAY; NEBULAE; CLOUDS; DUSTS; H2 REGIONS; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; COSMIC RADIO SOURCES; GALAXIES; OXIDES; OXYGEN COMPOUNDS; SPECTRA 640201* -- Atmospheric Physics-- Auroral, Ionospheric, & Magetospheric Phenomena; 640105 -- Astrophysics & Cosmology-- Galaxies

Citation Formats

Baran, G.P. CO survey of the dark nebulae in Taurus and Perseus. United States: N. p., 1986. Web.
Baran, G.P. CO survey of the dark nebulae in Taurus and Perseus. United States.
Baran, G.P. Wed . "CO survey of the dark nebulae in Taurus and Perseus". United States.
@article{osti_7131199,
title = {CO survey of the dark nebulae in Taurus and Perseus},
author = {Baran, G.P.},
abstractNote = {The thesis reports a large-scale survey of carbon monoxide (/sup 12/CO) emission (at lambda = 2.6 mm) from dark nebulae in Taurus and Perseus. CO spectra at 4395 points were obtained within an area of about 800 square degrees generally west of the galactic anti-center. The spatial resolution of the instrument was eight arcminutes and velocity resolution was 2.6 km s/sup -1//. CO emission is strongest wherever extinction by dust is greatest, spilling over the apparent outer boundaries of the dust clouds observed optically. Combining CO velocity for the nebulae with optically determined distances shows that the clouds in the survey area form several layers. The molecular cloud mass closest to the sun is the Taurus and Auriga complex about 150 +/- 50 pc). Nearer to the Per )B2 OB association (at 350 +/- 100 pc) than the Taurus clouds are the Per OB2 molecular cloud (350 +/- 100 pc) and the California Nebula = NGC15979 molecular clouds (at 400 +/- 150 pc). Cloud masses were determined from integrated CO emission intensity alone by assuming that ..gamma..-ray emission intensities can be used to relate H/sub 2/ column densities to CO emission intensities.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1986},
month = {1}
}

Thesis/Dissertation:
Other availability
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