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Recombination lines and maser effects

Published online by Cambridge University Press:  07 February 2024

Zulema Abraham Open the ORCID record for Zulema Abraham [Opens in a new window]
Zulema Abraham*
Affiliation:
Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo Rua do Matão 1226, CEP 05508-090, São Paulo, Brazil.
*
email: zulema.abraham@iag.usp.br
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Abstract

Maser effects occur in recombination lines when the plasma departs from local thermodynamic equilibrium (LTE). Its consequence is not as dramatic as that found in molecular masers, and therefore it is more difficult to recognize. Besides, it occurs in compact high density regions, and its lines fall at millimeter and submillimeter wavelengths, only recently available with good angular resolution. This review will focus on the theoretical aspects of maser recombination lines and on the recent detection of these masers in different astronomical objects.

Keywords

masersradio linesstars: mass lossHII regionsjets and outflows
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. 414 - 421
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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