Seeing the forest and the trees: a radio investigation of the ULIRG Mrk 273
Pranav Kukreti, Raffaella Morganti, Marco Bondi, Tom Oosterloo, Clive, Tadhunter, Leah K. Morabito, E.A.K. Adams, B. Adebahr, W.J.G. de Blok, F. de, Gasperin, A. Drabent, K.M. Hess, M.V. Ivashina, A. Kutkin, \'A.M. Mika, Leon, Oostrum, T.W. Shimwell, J.M. van der Hulst

TL;DR
This study uses multi-frequency radio observations to analyze the ULIRG Mrk 273, revealing large-scale arcs and nuclear activity linked to galaxy merger processes, and highlights the importance of radio emission in understanding ULIRGs.
Contribution
First detection of a giant 190 kpc radio arc in Mrk 273 using LOFAR, linking large-scale radio features to merger-driven nuclear activity.
Findings
Discovery of a 190 kpc radio arc in Mrk 273.
Identification of a steep spectrum radio AGN component.
Detection of diffuse emission around nuclear components.
Abstract
Galaxy mergers have been observed to trigger nuclear activity by feeding gas to the central supermassive black hole. One such class of objects are Ultra Luminous InfraRed Galaxies (ULIRGs), which are mostly late stage major mergers of gas-rich galaxies. Recently, large-scale (100 kpc) radio continuum emission has been detected in a select number of ULIRGs, all of which also harbour powerful Active Galactic Nuclei (AGN). This hints at the presence of large-scale radio emission being evidence for nuclear activity. Exploring the origin of this radio emission and its link to nuclear activity requires high sensitivity multi-frequency data. We present such an analysis of the ULIRG Mrk 273. Using the International LOFAR telescope (ILT), we detected spectacular large-scale arcs in this system. This detection includes, for the first time, a giant 190 kpc arc in the north. We propose…
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