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Imaging Polarimetry of Nearby Molecular Clouds

Published online by Cambridge University Press:  12 April 2016

A.N. Ramaprakash ,
S.N. Tandon  and
R. Gupta
A.N. Ramaprakash
Affiliation:
Inter-University Centre for Astronomy and Astrophysics, Ganeshkhind, Pune – 411 007, India
S.N. Tandon
Affiliation:
Inter-University Centre for Astronomy and Astrophysics, Ganeshkhind, Pune – 411 007, India
R. Gupta
Affiliation:
Inter-University Centre for Astronomy and Astrophysics, Ganeshkhind, Pune – 411 007, India

Abstract

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In order to study the role played by the magnetic fields in the dynamics of the interstellar medium (ISM) a two-channel imaging polarimeter (IMPOL) has been constructed. The instrument is capable of multi-wavelength observations in the visible and very near infrared (IR) wavelengths, has a sensitive CCD detector and a built-in acquisition and guidance unit. When used with a 1.2m, f/13 telescope IMPOL gives a field of view of 6 × 6 arcmin with an angular resolution of 2" so that it is well-suited to observe both faint extended objects and moderately crowded stellar fields. The instrumental polarization is less than 0.05% and the accuracy of the measurements is primarily limited by photon noise in a typical observation. In this paper, we present a brief description of the instrument and observational techniques, as well as the results of a successful observation of a molecular cloud close to the open cluster IC 5146.

Type
Part V Magnetic Fields, Molecular Clouds, and Interstellar Bubbles
Information
International Astronomical Union Colloquium , Volume 166: The Local Bubble and Beyond , 1997 , pp. 243 - 246
Copyright
Copyright © Springer-Verlag 1998

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