J/A+A/664/A25ivo://CDS.VizieR/J/A+A/664/A25doi:10.26093/cds/vizier.36640025CDSKukreti P.Morganti R.Bondi M.Oosterloo T.Tadhunter C.,Morabito L.K.Adams E.A.K.Adebahr B.de Blok W.J.G.de Gasperin F.,Drabent A.Hess K.M.Ivashina M.V.Kutkin A.Mika A.M.Oostrum L.C.,Shimwell T.W.van der Hulst J.M.van Leeuwen J.van Weeren R.J.,Vohl D.Ziemke J.2022-11-25T13:32:06Z2022-08-03T12:50:34ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frradio-galaxiesradio-continuum-emissionGalaxy 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 (~100kpc) 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 ~190kpc arc in the north. We propose these arcs are fuelled by a low power radio AGN triggered by the merger. We also identified a bright ~45kpc radio ridge, which is likely related to the ionised gas nebula in that region. We combined this with high sensitivity data from APERture Tile In Focus (Apertif) and archival data from the Very Large Array (VLA) to explore the spectral properties. The ILT simultaneously allowed us to probe the nucleus at a resolution of ~0.300, where we detected three components, and, for the first time, diffuse emission around these components. Combining this with archival high frequency VLA images of the nucleus allowed us to detect absorption in one component, and a steep spectrum radio AGN in another. We then extrapolate from this case study to the importance of investigating the presence of radio emission in more ULIRGs and what it can tell us about the link between mergers and the presence of radio activity.2022A&A...664A..25Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/664/A25CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/664/A25https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/664/A25http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/664/A25https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/664/A25https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/664/A25http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/664/A25GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/664/A25/list (List of fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/664/A25/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/664/A25/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/664/A25/list?GETtext/xml+votable180.050000true204.4265255.891110.0055555555555555566/11101-11102https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/664/A25?format=asciiRadiodefaultJ/A+A/664/A25/listList of fits imagesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintObs.dateObservation datestime.epoch;obsnullableFreqObserved frequencyMHzem.freqintsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar