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Maser Activity of Large Molecules toward Sgr B2 North

Published online by Cambridge University Press:  07 February 2024

Ci Xue Open the ORCID record for Ci Xue [Opens in a new window] ,
Anthony Remijan ,
Alexandre Faure Open the ORCID record for Alexandre Faure [Opens in a new window]  and
Brett McGuire
Ci Xue*
Affiliation:
Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Anthony Remijan
Affiliation:
National Radio Astronomy Observatory, Charlottesville, VA 22903, USA
Alexandre Faure
Affiliation:
Université Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, France
Brett McGuire
Affiliation:
Massachusetts Institute of Technology, Cambridge, MA 02139, USA. National Radio Astronomy Observatory, Charlottesville, VA 22903, USA
*
email: cixue@mit.edu
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Abstract

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Single-dish observations at centimeter wavelengths have suggested that the Sgr B2 molecular cloud at the Galactic Center hosts weak maser emission from several large molecules. Here, we present the interferometric observations of the Class I methanol (CH3OH) maser at 84 GHz, the methanimine (CH2NH) maser at 5.29 GHz, and the methylamine (CH2NH2) maser at 4.36 GHz toward Sgr B2 North (N). We use a Bayesian approach to quantitatively assess the observed masing spectral profiles and the excitation conditions. By comparing the spatial origin and extent of maser emission from several molecular species, we find that the new maser transitions have a close spatial relationship with the Class I masers, which suggests a similar collisional pumping mechanism.

Keywords

ISM: moleculesInterstellar masersSpectral line identification
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. 194 - 198
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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