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Variability, flaring and coherence – the complementarity of the maser and superradiance regimes

Published online by Cambridge University Press:  07 February 2024

Martin Houde Open the ORCID record for Martin Houde [Opens in a new window] ,
Fereshteh Rajabi ,
Gordon C. MacLeod ,
Sharmila Goedhart Open the ORCID record for Sharmila Goedhart [Opens in a new window] ,
Yoshihiro Tanabe Open the ORCID record for Yoshihiro Tanabe [Opens in a new window] ,
Stefanus P. van den Heever ,
Christopher M. Wyenberg  and
Yoshinori Yonekura Open the ORCID record for Yoshinori Yonekura [Opens in a new window]
Martin Houde*
Affiliation:
The University of Western Ontario, London, Ontario N6A 3K7, Canada.
Fereshteh Rajabi
Affiliation:
McMaster University, Hamilton, Ontario L8S 4M1, Canada
Gordon C. MacLeod
Affiliation:
The Open University of Tanzania, P.O. Box 23409, Dar-Es-Salaam, Tanzania Hartebeesthoek Radio Astronomy Observatory, P.O. Box 443, Krugersdorp, 1741, South Africa
Sharmila Goedhart
Affiliation:
South African Radio Astronomy Observatory, 2 Fir Street, Black River Park, Observatory 7925, South Africa Center for Space Research, North-West University, Potchefstroom Campus, Private Bag X6001, Potchefstroom 2520, South Africa
Yoshihiro Tanabe
Affiliation:
Center for Astronomy, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan
Stefanus P. van den Heever
Affiliation:
Hartebeesthoek Radio Astronomy Observatory, P.O. Box 443, Krugersdorp, 1741, South Africa
Christopher M. Wyenberg
Affiliation:
Institute for Quantum Computing and Department of Physics and Astronomy, The University of Waterloo, 200 University Ave. West, Waterloo, Ontario N2L 3G1, Canada
Yoshinori Yonekura
Affiliation:
Center for Astronomy, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan
*
email: [email protected]
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Abstract

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We discuss the role that coherence phenomena can have on the intensity variability of spectral lines associated with maser radiation. We do so by introducing the fundamental cooperative radiation phenomenon of (Dicke’s) superradiance and discuss its complementary nature to the maser action, as well as its role in the flaring behaviour of some maser sources. We will consider examples of observational diagnostics that can help discriminate between the two, and identify superradiance as the source of the latter. More precisely, we show how superradiance readily accounts for the different time-scales observed in the multi-wavelength monitoring of the periodic flaring in G9.62+0.20E.

Keywords

Radiative processes: non-thermalmasersISM: moleculesISM: G9.62+0.20E
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S380: Cosmic Masers: Proper Motion toward the Next-Generation Large Projects , December 2022 , pp. 399 - 413
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re- use, distribution and reproduction, provided the original article is properly cited.
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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