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OH megamaser emission in the outflow of the luminous infrared galaxy Zw049.057

Published online by Cambridge University Press:  07 February 2024

Susanne Aalto Open the ORCID record for Susanne Aalto [Opens in a new window] ,
Boy Lankhaar ,
Clare Wethers ,
Javier Moldon Open the ORCID record for Javier Moldon [Opens in a new window]  and
Robert Beswick
Susanne Aalto*
Affiliation:
Department of Space Earth and Environment, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden.
Boy Lankhaar
Affiliation:
Department of Space Earth and Environment, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden. Leiden Observatory, Leiden University, 2300 RA, Leiden, The Netherlands
Clare Wethers
Affiliation:
Department of Space Earth and Environment, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden.
Javier Moldon
Affiliation:
Instituto de Astrofsica de Andaluca (IAA, CSIC), Glorieta de la Astronoma, s/n, E-18008 Granada, Spain
Robert Beswick
Affiliation:
Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Alan Turing Building, Oxford Road, Manchester, M13 9PL, UK
*
email: saalto@chalmers.se
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Abstract

High resolution (0."26 × 0."13 (70 × 35 pc)) L-band (18 cm) OH megamaser (OHM) e-Merlin observations of the LIRG Zw049.057 show that the emission is emerging from a low velocity outflowing structure - which is foreground to a fast, dense and collimated molecular outflow detected by ALMA. The extremely dusty compact obscured nucleus (CON) of Zw049.057 has no (or only little) OHM emission associated with it - possibly because of too high number densities that quench the OHM. In contrast we detect 6 cm H2CO emission primarily from the CON-region. We suggest that the OHM-region of Zw049.057 is not directly associated with star formation, but instead occurs in a wide-angle, slow outflow that surrounds the fast and dense outflow. The OHM is pumped by IR emission that likely stems from activities in the nucleus. We briefly discuss how OHM emission can be used as a probe of LIRG-CON galaxies.

Keywords

galaxies: evolutiongalaxies: individual: Zw049.057galaxies: activegalaxies: nucleiISM: moleculesISM: jets 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. 40 - 44
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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