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Astrophysics and Space Science

, 361:381 | Cite as

Magnetic field geometry of the large globule CB 34

  • A. Das
  • H. S. DasEmail author
  • Biman J. Medhi
  • S. Wolf
Original Article

Abstract

We report the results of optical polarimetric observations of a Bok globule CB34 to study magnetic field structure on large scales (\(10^{5}\mbox{--}10^{6}~\mbox{AU}\)), which is combined with archival sub-mm observations to characterize the magnetic field structure of CB34 on small scales (\(10^{4}\mbox{--}10^{5}~\mbox{AU}\)). The optical polarization measurements indicate that the magnetic field in the globule is constrained to a maximum radius of \(10^{5}~\mbox{AU}\) around the core, out to densities not smaller than \(10^{4}\mbox{ cm}^{-3}\). Our study is mainly concentrated on two submillimeter cores C1 and C2 of CB34. The direction of magnetic field of core C2 is found to be nearly perpendicular to the CO outflow direction of the globule. The magnetic field of core C1 is almost aligned with the minor axis of the core which is typical for magnetically dominated star formation models. The mean value of offset between the minor axis of core C2 and the outflow direction is found to be \(14^{\circ }\) which suggests that the direct ion of the outflow is almost aligned with the minor axis of core C2. The magnetic field strength in the plane-of-sky for cores C1 and C2 is estimated to be \(\approx 34~\upmu\mbox{G}\) and \(\approx 70~\upmu\mbox{G}\).

Keywords

ISM: clouds Polarization ISM: magnetic fields 

Notes

Acknowledgements

We are thankful to ARIES, Nainital for providing us the Telescope time. This work makes use of data products from the CADC repository of the SCUBA Polarimeter Legacy Catalogue and is highly acknowledged. We also acknowledge the use of the VizieR database of astronomical catalogues namely Two Micron All Sky Survey (2MASS), which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. We are thankful to anonymous referee for helpful suggestions which definitely helped to improve the quality of the paper. This work is supported by the Science and Engineering Research Board (SERB), a statutory body under Department of Science and Technology (DST), Government of India, under Fast Track scheme for Young Scientist (SR/FTP/PS-092/2011).

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Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  1. 1.Department of PhysicsAssam UniversitySilcharIndia
  2. 2.Aryabhatta Research Institute of Observational SciencesNainitalIndia
  3. 3.Institute of Theoretical Physics and AstrophysicsUniversity of KielKielGermany

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