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Physical properties...
Physical properties of outflows Comparing CO- and H2O-based parameters in Class 0 sources
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- Bjerkeli, Per, 1977 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Liseau, René, 1949 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Nisini, B. (författare)
- Osservatorio Astronomico di Roma
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- Tafalla, M. (författare)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Bergman, Per, 1960 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Melnick, G. J. (författare)
- Harvard-Smithsonian Center for Astrophysics
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- Rydbeck, Gustaf, 1942 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2013-03-29
- 2013
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 552
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http://publications.... (primary) (free)
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https://www.aanda.or...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Context. The observed physical properties of outflows from low-mass sources put constraints on possible ejection mechanisms. Historically, these quantities have been derived from CO using ground-based observations. It is, therefore, important to investigate whether parameters such as momentum rate (thrust) and mechanical luminosity (power) are the same when different molecular tracers are used.Aims. Our objective is to determine the outflow momentum, dynamical time-scale, thrust, energy, and power using CO and H2O as tracers of outflow activity.Methods. Within the framework of the Water In Star-forming regions with Herschel (WISH) key program, three molecular outflows from Class 0 sources have been mapped using the Heterodyne Instrument for the Far Infrared (HIFI) instrument aboard Herschel. We used these observations together with previously published H-2 data to infer the physical properties of the outflows. We compared the physical properties derived here with previous estimates based on CO observations.Results. Inspection of the spatial distribution of H2O and H-2 confirms that these molecules are co-spatial. The most prominent emission peaks in H-2 coincide with strong H2O emission peaks and the estimated widths of the flows when using the two tracers are comparable.Conclusions. For the momentum rate and the mechanical luminosity, inferred values are not dependent on which tracer is used, i.e. the values agree to within a factor of 4 and 3, respectively.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- hifi
- stars: formation
- shock-waves
- protostellar outflows
- bipolar outflow
- water emission
- ISM: jets and outflows
- herschel-pacs
- h-2 emission
- l1157
- stars: winds
- star-forming regions
- ISM: molecules
- driven molecular outflows
- outflows
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Bjerkeli, Per, 1 ...
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Liseau, René, 19 ...
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Nisini, B.
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Tafalla, M.
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Bergman, Per, 19 ...
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Melnick, G. J.
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visa fler...
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Rydbeck, Gustaf, ...
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visa färre...
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Chalmers tekniska högskola