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SKA studies of in situ synchrotron radiation from molecular clouds

Dickinson, Clive and Beck, R. and Crocker, R. and Crutcher, R. M. and Davies, R. D. and Ferrière, K. and Fuller, G. and Jaffe, T. and Jones, D. I. and Leahy, J. P. and Murphy, E. J. and Peel, M. W. and Orlando, E. and Porter, T. and Protheroe, R. J. and Robishaw, T. and Strong, A. W. and Watson, R. A. and Yusef-Zadeh, F. (2014) SKA studies of in situ synchrotron radiation from molecular clouds. In: Advancing Astrophysics with the Square Kilometre Array (AASKA14). Proceedings of Science. No.215. SISSA , Trieste, Italy, Art. No. 102.

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Observations of the properties of dense molecular clouds are critical in understanding the process of star-formation. One of the most important, but least understood, is the role of the magnetic fields. We discuss the possibility of using high-resolution, high-sensitivity radio observations with the SKA to measure for the first time the in-situ synchrotron radiation from these molecular clouds. If the cosmic-ray (CR) particles penetrate clouds as expected, then we can measure the B-field strength directly using radio data. So far, this signature has never been detected from the collapsing clouds themselves and would be a unique probe of the magnetic field. Dense cores are typically ∼ 0.05 pc in size, corresponding to ∼arcsec at ∼kpc distances, and flux density estimates are ∼ mJy at 1 GHz. The SKA should be able to readily detect directly, for the first time, along lines-of-sight that are not contaminated by thermal emission or complex foreground/background synchrotron emission. Polarised synchrotron may also be detectable providing additional information about the regular/turbulent fields.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Dickinson, Clive0000-0002-0045-442X
Fuller, G.0000-0001-8509-1818
Murphy, E. J.0000-0001-7089-7325
Peel, M. W.0000-0003-3412-2586
Strong, A. W.0000-0003-3799-5489
Additional Information:Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-ShareAlike. CD acknowledges support from an ERC Starting (Consolidator) Grant (no. 307209).
Funding AgencyGrant Number
European Research Council (ERC)307209
Series Name:Proceedings of Science
Issue or Number:215
Record Number:CaltechAUTHORS:20180910-131320837
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89489
Deposited By: George Porter
Deposited On:11 Sep 2018 15:03
Last Modified:09 Mar 2020 13:19

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