Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...238..337z&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 238, no. 1-2, Nov. 1990, p. 337-346.
Astronomy and Astrophysics
Astrophysics
34
Carbon Isotopes, Carbon Monoxide, Interstellar Matter, Molecular Clouds, Astronomical Maps, Gravitational Effects, Line Of Sight, Molecular Gases, Submillimeter Waves
Scientific paper
The J = 1 to 0 line of (C-12)O, (C-13)O, and C(O-18) in the nearest molecular cloud, L1457, located at a distance of only 65 pc, using the 3-m telescope of KOSMA (Cologne observatory for submillimeter astronomy). To first order both (C-12)O and (C-13)O show the same distribution of the molecular gas. In L1457 a hierarchical fragmentation is found with at least 3 major components almost as large as the whole cloud. On a smaller scale, 15 clumps are identified which are kinematically or spatially separated from each other; their line components fall into five velocity ranges of which four are disjunct. The clumps' masses are between 1 and 50 solar masses and their radii range from 0.1 pc to 0.7 pc. The mass of the whole molecular cloud, between 40 and 200 solar masses, is not sufficiently high to bind the cloud gravitationally.
Ungerechts Hans
Zimmermann Tomas
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