The fountain of the luminous infrared galaxy Zw049.057 as traced by its OH megamaser

High-resolution ( [10 - 35 pc]) e-MERLIN (lambda 6 - 18 cm) and ( [6.5 pc]) ALMA (lambda 1.1 mm) observations have been used to image OH (hydroxyl) and H2CO (formaldehyde) megamaser emission, and HCN 3 -> 2 emission toward the nuclear ( 2 emission reveals extended emission, along the disk minor a...

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Detalhes bibliográficos
Autores: Lankhaar, B., Aalto, S., Wethers, C.F., Moldon, J., Beswick, R., Gorski, M., Konig, S., Yang, C., Mangum, J.G., Gallagher, J.S., Combes, F., Rigopoulou, D., González Alfonso, Eduardo|||0000-0001-5285-8517, Müller, S., García Bernete, I., Henkel, C., Nishimura, Y., Ricci, C.
Formato: artículo
Fecha de publicación:2024
País:España
Recursos:Universidad de Alcalá (UAH)
Repositorio:e_Buah Biblioteca Digital Universidad de Alcalá
Idioma:inglés
OAI Identifier:oai:ebuah.uah.es:10017/67607
Acesso em linha:http://hdl.handle.net/10017/67607
https://dx.doi.org/10.1051/0004-6361/202450065
Access Level:acceso abierto
Palavra-chave:Masers
ISM: jets and outflows
Galaxies: evolution
Galaxies: ISM
Galaxies: kinematics and dynamics
Galaxies: nuclei
Astronomía
Astronomy
Descrição
Resumo:High-resolution ( [10 - 35 pc]) e-MERLIN (lambda 6 - 18 cm) and ( [6.5 pc]) ALMA (lambda 1.1 mm) observations have been used to image OH (hydroxyl) and H2CO (formaldehyde) megamaser emission, and HCN 3 -> 2 emission toward the nuclear ( 2 emission reveals extended emission, along the disk minor axis out to similar to 60 pc (). Analysis of the minor axis HCN emission reveals high-velocity features extending out to 600 km s(-1), redshifted on the SE side and blueshifted on the NW side. We propose that the high-velocity HCN emission traces a fast (> 250 km s(-1)) and collimated outflow that is enveloped by a wide-angle and slow (similar to 50 km s(-1)) outflow that is traced by the OHM emission. Analysis of the outflow kinematics suggests that the slow wide-angle outflow will not reach escape velocity and will instead fall back to the galaxy disk, evolving as a so-called fountain flow, while the fast collimated outflow traced by HCN emission will likely escape the nuclear region. We suggest that the absence of OHM emission in the nuclear region is due to high densities there. Even though OHMs associated with outflows are an exception to conventional OHM emission, we expect them to be common in CON sources that host both OHM and H2CO megamasers.

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