Oral Presentation

Host Galaxy Morphology of LOFAR Radio AGN in the Subaru HSC Deep Field ELAIS-N1

Author(s): Kateryna Vovk (Kavli IPMU), John Silverman (Kavli IPMU)

Presenter: Kateryna Vovk (Kavli IPMU, Tokyo University)

We investigate the structural properties of host galaxies of LOFAR radio AGN in the ELAIS–N1 field. By cross-matching the Subaru HSC PDR3 catalogue with the LOFAR DR1 150 MHz survey, we assemble a sample of approximately 9,700 radio-emitting systems at 0.2 < z < 1.0. The sources are classified into four subtypes: star-forming galaxies (SF), radio-quiet AGN (RQ), low-excitation radio galaxies (LERGs), and high-excitation radio galaxies (HERGs). We measure Sérsic indices and effective radii for all objects and examine their distributions across redshift in four stellar-mass bins, comparing them to star-forming and quiescent galaxies from the HSC SSP survey. We find that radio galaxies broadly follow the size–mass and Sérsic index–mass relations of the overall galaxy population. LERGs are marginally more compact, particularly at high stellar masses, consistent with their association with massive, early-type hosts. The redshift evolution of structural parameters for the SF, RQ, and LERG subsamples aligns with that of non-radio galaxies, while the HERG sample remains too small for robust conclusions.