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Title:
Molecular clouds in the Carina arm
Authors:
Cohen, R. S.; Grabelsky, D. A.; May, J.; Alvarez, H.; Bronfman, L.; Thaddeus, P.
Affiliation:
AA(Columbia University, New York, NY), AB(Columbia University, New York, NY), AC(Universidad de Chile, Santiago, Chile), AD(Universidad de Chile, Santiago, Chile), AE(Columbia University, New York, NY; Universidad de Chile, Santiago, Chile), AF(NASA, Goddard Institute for Space Studies; Columbia University, New York, NY)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 290, March 1, 1985, p. L15-L20. (ApJL Homepage)
Publication Date:
03/1985
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
GALACTIC STRUCTURE, INTERSTELLAR MATTER, MILKY WAY GALAXY, MOLECULAR CLOUDS, ASTRONOMICAL MAPS, CARBON MONOXIDE, SOUTHERN SKY, SPATIAL DISTRIBUTION
DOI:
10.1086/184433
Bibliographic Code:
1985ApJ...290L..15C

Abstract

From a new survey of the 2.6 mm line of CO in the southern Milky Way, 37 molecular clouds were identified along the Carina arm from l = 282 deg to 336 deg with masses generally greater than 10 to the 5th solar mass. The clouds lie approximately every 700 pc along a spiral segment that is nearly 25 kpc long and has a pitch of about 10 deg. The total mass of these clouds is 40 x 10 to the 6th solar mass, or rougly 1 x 10 to the 6th solar mass each on average. The abrupt tangent point in molecular clouds at l = 280 deg and the characteristic loop structure in the l-v diagram are unmistakable evidence of a CO spiral arm in Carina. This arm apparently connects with the northern hemisphere Sagittarius arm to form a single 10 deg spiral which extends more than two-thirds of the way around the Galaxy.

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