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Flaring Masers and Pumping

Published online by Cambridge University Press:  07 February 2024

M. D. Gray Open the ORCID record for M. D. Gray [Opens in a new window] ,
S. Etoka Open the ORCID record for S. Etoka [Opens in a new window] ,
B. Pimpanuwat Open the ORCID record for B. Pimpanuwat [Opens in a new window] ,
A. M. S. Richards Open the ORCID record for A. M. S. Richards [Opens in a new window]  and
F. J. Cowie
M. D. Gray*
Affiliation:
National Astronomical Research Institute of Thailand, 260 Moo 4, T. Donkaew, A. Maerim, Chiangmai 50180, Thailand.
S. Etoka
Affiliation:
Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, University of Manchester, M13 9PL, UK.
B. Pimpanuwat
Affiliation:
Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, University of Manchester, M13 9PL, UK.
A. M. S. Richards
Affiliation:
Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, University of Manchester, M13 9PL, UK.
F. J. Cowie
Affiliation:
Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, University of Manchester, M13 9PL, UK.
*
email: malcolm@narit.or.th
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Abstract

We briefly consider the history of maser variability, and of flaring variability specifically. We consider six proposed flare generation mechanisms, and model them computationally with codes that include saturation and 3-D structure (the last mechanism is modelled in 1-D). Fits to observational light curves have been made for some sources, and we suggest that a small number of observational parameters can diagnose the flare mechanism in many cases. The strongest flares arise from mechanisms that can increase the number density of inverted molecules in addition to by geometrical effects, and in events where unsaturated quiescent masers become saturated during the flare.

Keywords

masersmolecular processesradiative transferradio lines: ISM
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. 422 - 429
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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