onr:"swepub:oai:research.chalmers.se:55432fb7-5cf8-451f-bea7-44820e0beca5"
Search: onr:"swepub:oai:research.chalmers.se:55432fb7-5cf8-451f-bea7-44820e0beca5" > The magnetic field ...
- 1 of 1
- Previous record
- Next record
- To hitlist
- Alves, F. O.Universität Bonn,University of Bonn (author)
The magnetic field of IRAS 16293-2422 as traced by shock-induced H2O masers
- Article/chapterEnglish2012
Publisher, publication year, extent ...
- 2012-05-25
- EDP Sciences,2012
- electronicrdacarrier
Numbers
- LIBRIS-ID:oai:research.chalmers.se:55432fb7-5cf8-451f-bea7-44820e0beca5
- https://doi.org/10.1051/0004-6361/201118710DOI
- https://research.chalmers.se/publication/162869URI
Supplementary language notes
- Language:English
- Summary in:English
Part of subdatabase
- SwePubSwePub
Classification
Notes
- Context. Shock-induced H2O masers are important magnetic field tracers of very high density gas. Water masers are found in both high-and low-mass star-forming regions, and are a powerful tool for comparing magnetic field morphologies in both mass regimes. Aims. We present one of the first magnetic field determinations for the low-mass protostellar core IRAS 16293-2422 at volume densities as high as 10(8-10) cm(-3). Our goal is to determine wether the collapsing regime of this source is controlled by magnetic fields or other factors such as turbulence. Methods. We used the Very Large Array (VLA) to carry out spectropolarimetric observations of the 22 GHz Zeeman emission from H2O masers. From the Stokes V line profile, we are then able to estimate the magnetic field strength in the dense regions around the protostar. Results. A blend of at least three maser features can be inferred from our relatively high spatial resolution data set (similar to 0.1 ''), which is reproduced as a clear non-Gaussian line profile. The emission is very stable in terms of polarization fraction and position angle across the channels. The maser spots are aligned with some components of the complex outflow configuration of IRAS 16293-2422, and are excited in zones of compressed gas produced by shocks. The post-shock particle density is in the range of 1-3 x 10(9) cm(-3), consistent with typical water-maser pumping densities. Zeeman emission is produced by a very strong line-of-sight magnetic field (B similar to 113 mG). Conclusions. The magnetic field pressure derived from our data is comparable to the ram pressure of the outflow dynamics. This indicates that the magnetic field is energetically important to the dynamical evolution of IRAS 16293-2422.
Subject headings and genre
- NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
- NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
- stars: formation
- ISM: individual objects: IRAS 16293-2422
- water masers
- polarization
- submillimeter array
- iras-16293-2422
- ISM: magnetic fields
- kinematics
- polarization
- masers
- dark clouds
- low-mass stars
- hot core
- infrared polarimetry
- star-forming regions
Added entries (persons, corporate bodies, meetings, titles ...)
- Vlemmings, Wouter,1974Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)wouterv (author)
- Girart, J. M.Universitat Autonoma de Barcelona (UAB) (author)
- Torrelles, J. M.Universitat de Barcelona,University of Barcelona (author)
- Universität BonnChalmers tekniska högskola (creator_code:org_t)
Related titles
- In:Astronomy and Astrophysics: EDP Sciences5420004-63611432-0746
Internet link
Find in a library
- Astronomy and Astrophysics (Search for host publication in LIBRIS)
To the university's database
- 1 of 1
- Previous record
- Next record
- To hitlist
Find more in SwePub
- By the author/editor
- Alves, F. O.
- Vlemmings, Woute ...
- Girart, J. M.
- Torrelles, J. M.
- About the subject
-
- NATURAL SCIENCES
- NATURAL SCIENCES
- and Physical Science ...
- and Astronomy Astrop ...
- Articles in the publication
- Astronomy and As ...
- By the university
- Chalmers University of Technology
Search outside SwePub
- Extend your search to:
- Google Book Search
- Google Scholar
Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.
- Copyright © LIBRIS - National Library Systems
- LIBRIS.kb.se
