Magnetic field measurement in TMC-1C using 22.3 GHz CCS Zeeman splitting

Author:

Koley Atanu12,Roy Nirupam2,Momjian Emmanuel3,Sarma Anuj P4,Datta Abhirup5

Affiliation:

1. Joint Astronomy Programme, Indian Institute of Science , Bangalore 560012, India

2. Department of Physics, Indian Institute of Science , Bangalore 560012, India

3. National Radio Astronomy Observatory , P. O. Box O, 1003 Lopezville Road, Socorro, NM 87801, USA

4. Physics and Astrophysics Department, DePaul University , 2219 N. Kenmore Ave., Chicago, IL 60614, USA

5. Discipline of Astronomy, Astrophysics and Space Engineering, Indian Institute of Technology Indore , Indore 453552, India

Abstract

ABSTRACT Measurement of magnetic fields in dense molecular clouds is essential for understanding the fragmentation process prior to star formation. Radio interferometric observations of CCS 22.3 GHz emission, from the starless core TMC-1C, have been carried out with the Karl G. Jansky Very Large Array to search for Zeeman splitting of the line in order to constrain the magnetic field strength. Toward a region offset from the dust peak, we report a detection of the Zeeman splitting of the CCS 21–10 transition, with an inferred magnetic field of ∼2 mG. If we interpret the dust peak to be the core of TMC-1C, and the region where we have made a detection of the magnetic field to be the envelope, then our observed value for the magnetic field is consistent with a subcritical mass-to-flux ratio envelope around a core with supercritical mass-to-flux ratio. The ambipolar diffusion time-scale for the formation of the core is consistent with the relevant time-scale based on chemical modelling of the TMC-1C core. This work demonstrates the potential of deep CCS observation to carry out future measurements of magnetic field strengths in dense molecular clouds and, in turn, understand the role of the magnetic field in star formation.

Funder

DST

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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