English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Galaxy mergers have been observed to trigger nuclear activity by feeding gasto the central supermassive black hole. One such class of objects are UltraLuminous InfraRed Galaxies (ULIRGs), which are mostly late stage major mergersof gas-rich galaxies. Recently, large-scale ($\sim$100 kpc) radio continuumemission has been detected in a select number of ULIRGs, all of which alsoharbour powerful Active Galactic Nuclei (AGN). This hints at the presence oflarge-scale radio emission being evidence for nuclear activity. Exploring theorigin of this radio emission and its link to nuclear activity requires highsensitivity multi-frequency data. We present such an analysis of the ULIRG Mrk273. Using the International LOFAR telescope (ILT), we detected spectacularlarge-scale arcs in this system. This detection includes, for the first time, agiant $\sim$190 kpc arc in the north. We propose these arcs are fuelled by alow power radio AGN triggered by the merger. We also identified a bright$\sim$45 kpc radio ridge, which is likely related to the ionised gas nebula inthat region. We combined this with high sensitivity data from APERture Tile InFocus (Apertif) and archival data from the Very Large Array (VLA) to explorethe spectral properties. The ILT simultaneously allowed us to probe the nucleusat a resolution of $\sim$0.3 arcsec, where we detected three components, and,for the first time, diffuse emission around these components. Combining thiswith archival high frequency VLA images of the nucleus allowed us to detectabsorption in one component, and a steep spectrum radio AGN in another. We thenextrapolate from this case study to the importance of investigating thepresence of radio emission in more ULIRGs and what it can tell us about thelink between mergers and the presence of radio activity.

Seeing the forest and the trees: a radio investigation of the ULIRG Mrk 273