Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26as..140..177w&link_type=abstract
Astronomy and Astrophysics Supplement, v.140, p.177-190
Astronomy and Astrophysics
Astrophysics
14
Ism: Clouds, Molecules, Radio Lines: Ism
Scientific paper
We have observed 12CO(1-0), 13CO(1-0), C18O(1-0), and CS(2-1) towards nine sources in the Vela region for which the 12CO(1-0) spectra by Wouterloot & Brand (\cite{wb89}) suggested the presence of strong line wings (towards two of those sources only CS or 12CO and 13CO were observed). The sources are located in or behind the Vela Molecular Ridge at distances between about 0.6 and 6.7 kpc. In all transitions we made small maps, typically several arcminutes in size. Towards five sources the 12CO emission is confused by unrelated components at other velocities (not visible in CS and C18O) which we subtracted from the line profiles before analysing the wing emission. The presence of outflow emission was studied by also subtracting the contribution of a central Gaussian line component. We conclude that of the eight sources observed in CO, seven show outflows, one does not. For one of the sources only the blue wing could be studied due to the confusing presence of other strong line components. For the outflow sources we derive the physical parameters. Wing emission has a relative outflow velocity up to about 16 km s-1, but the average (weighted with line intensity) is about 4 km s-1. Masses of the outflows range from 1 to 150 M_sun. CS and C18O were detected towards all eight (resp. seven) sources observed in these molecules. Five sources show single clumps in both transitions, two sources show several clumps in one of the transitions (the other was not mapped completely) and one source shows only weak emission (probably due to its distance). Clump masses and radii range from several 10 M_sun to about 1000 M_sun and 0.2 pc to 2 pc. Five of the sources show a velocity gradient in CS and C18O indicative of rotation. Based on observations collected at the European Southern Observatory, Chile.
Brand Jan
Wouterloot Jan G. A.
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