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Title:
Arecibo emission-absorption observations of Galactic OH
Authors:
Colgan, Sean W. J.; Salpeter, Edwin E.; Terzian, Yervant
Affiliation:
AA(NASA, Ames Research Center, Moffett Field, CA; Cornell University, Ithaca, NY), AB(Cornell University, Ithaca, NY), AC(Cornell University, Ithaca, NY)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 336, Jan. 1, 1989, p. 231-242. Research supported by the National Astronomy and Ionosphere Center. (ApJ Homepage)
Publication Date:
01/1989
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ABSORPTION SPECTRA, HYDROXYL EMISSION, INTERSTELLAR GAS, MILKY WAY GALAXY, MOLECULAR CLOUDS, CARBON MONOXIDE, CONTINUOUS RADIATION, H II REGIONS, PARTICLE COLLISIONS, SPECTRAL LINE WIDTH
DOI:
10.1086/167008
Bibliographic Code:
1989ApJ...336..231C

Abstract

Observations of OH emission/absorption toward 19 low-Galactic-latitude background-continuum sources are reported. Data obtained at 1.665 and 1.667 GHz using the 12-m radio telescope at Arecibo Observatory during February-March 1984, are presented in extensive tables and graphs and characterized in detail, with reference to theoretical models. A total of 11 OH absorption features were detected toward nine of the sources, with an average of one feature of optical depth 0.02 or greater per 5 kpc of path length and an average column density of 1.6 x 10 to the 12th/sq cm (corrected to b = 90 deg).

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