Abstract
This paper describes the polarisation study of a Lynds cloud, LDN 1340, \(\alpha = 2\)h32m and \(\delta = 73^{\circ } 00^\prime \) corresponding to galactic coordinates of \(\ell = 130^{\circ }.07\) and \(b=\) 11\(^{\circ }.6\), with emphasis on the RNO 8 area. The cloud has been observed using the 1.2 m telescope at Mt. Abu Infrared Observatory, in the infrared wavelength band using the Near-Infrared Camera, Spectrograph and Polarimeter instrument. The polarimetric observations were used to map the magnetic field geometry around the region. We combined our measurements with archival data from the 2MASS and WISE surveys. The Gaia EDR3 and DR3 data for the same region were used for distance, proper motion, and other astrophysical information. The analysis of the data reveals areas with ordered polarisation vectors in the region of RNO 8. The position angle measurements reveal polarisation due to dichroic extinction which is consistent with the Galactic magnetic field. The magnetic field strength was calculated for the RNO 8 region using the Chandrashekhar–Fermi method and the value estimated is \(\sim \)42 \(\mu \)G.
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http://vizier.u-strasbg.fr/
Data downloaded from https://irsa.ipac.caltech.edu/Missions/wise.html.
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Acknowledgements
We acknowledge the support provided by the observatory and technical staff at Mt. Abu Infrared Observatory (MIRO), PRL during observations. We are grateful to the night operators present at MIRO for their assistance during the observation run. We thank our colleagues in the Astronomy & Astrophysics Division, PRL, for useful discussions and comments. We acknowledge the anonymous referee for all the valuable points which improved the quality of the paper. This work has made use of data from the European Space Agency (ESA) mission Gaia, https://www.cosmos.esa.int/gaia processed by the Gaia Data Processing and Analysis Consortium (DPAC), https://www.cosmos.esa.int/web/gaia/dpac/consortium. Funding for the DPAC has been provided by national institutions, in particular, the institutions participating in the Gaia multilateral agreement. This publication makes use of data products from the 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. This research has made use of the VizieR catalogue access tool, CDS, Strasbourg, France. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration.
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Rai, A., Ganesh, S. Infrared polarisation study of Lynds 1340: A case of RNO 8. J Astrophys Astron 44, 16 (2023). https://doi.org/10.1007/s12036-022-09905-9
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DOI: https://doi.org/10.1007/s12036-022-09905-9