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- Title
OH megamaser emission in the outflow of the luminous infrared galaxy Zw049.057.
- Authors
Aalto, Susanne; Lankhaar, Boy; Wethers, Clare; Moldon, Javier; Beswick, Robert
- 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.
- Subjects
GALAXIES; STAR formation; GALACTIC evolution; ACTIVE galaxies; STARBURSTS
- Publication
Proceedings of the International Astronomical Union, 2022, Vol 18, Issue S380, p40
- ISSN
1743-9213
- Publication type
Article
- DOI
10.1017/S1743921323003307