Shapes of galaxies hosting radio-loud AGNs with z \leq 1
arXiv:2207.09894 · doi:10.1051/0004-6361/202141257
Abstract
Links between the properties of radio-loud active galactic nuclei (RLAGNs) and the morphology of their hosts may provide important clues for our understanding of how RLAGNs are triggered. In this work, focusing on passive galaxies, we study the shape of the hosts of RLAGNs selected from the Karl G. Jansky Very Large Array Cosmic Evolution Survey (VLA-COSMOS) 3GHz Large Project, and compare them with previous results based on the first data release (DR1) of the LOFAR Two-Metre Sky Survey (LoTSS). We find that, at redshifts of between 0.6 and 1, high-luminosity () RLAGNs have a wider range of optical projected axis ratios than their low-redshift counterparts, which are essentially all found in round galaxies with axis ratios of higher than 0.7. We construct control samples and show that although the hosts of high-redshift RLAGNs with the highest luminosities still have a rounder shape compared with the non-RLAGNs, they on average have a smaller axis ratio (more elongated) than the local RLAGNs with similar stellar masses and radio luminosities. This evolution can be interpreted as a byproduct of radio luminosity evolution, namely that galaxies at fixed stellar mass are more radio luminous at high redshifts: artificially increasing the radio luminosities of local galaxies (0.3) by a factor of 2 to 4 can remove the observed evolution of the axis ratio distribution. If this interpretation is correct then the implication is that the link between AGN radio luminosity and host galaxy shape is similar at to in the present-day Universe.
10 pages, 6 figures. Accepted by A&A
References in corpus (16)
- Heating Hot Atmospheres with Active Galactic Nuclei
- The Co-Evolution of Galaxies and Supermassive Black Holes: Insights from Surveys of the Contemporary Universe
- Detection of quiescent galaxies in a bicolor sequence from z=0-2
- Radio-Loudness of Active Galactic Nuclei: Observational Facts and Theoretical Implications
- The Evolution of Galaxy Structure over Cosmic Time
- AGN-controlled cooling in elliptical galaxies
- Stellar Masses and SFRs for 1M Galaxies from SDSS and WISE
- Compact steep-spectrum and peaked-spectrum radio sources
- Extragalactic Peaked-Spectrum Radio Sources at Low Frequencies
- The ALMA Spectroscopic Survey in the HUDF: Multi-band constraints on line luminosity functions and the cosmic density of molecular gas
- The triggering probability of radio-loud AGN: A comparison of high and low excitation radio galaxies in hosts of different colors
- The Advanced Camera for Surveys General Catalog: Structural Parameters for Approximately Half a Million Galaxies
- Do AGN triggering mechanisms vary with radio power? I.Optical morphologies of radio-intermediate HERGs
- Link between radio-loud AGNs and host-galaxy shape
- An Absence of Radio-Loud Active Galactic Nuclei in Geometrically Flat Quiescent Galaxies: Implications for Maintenance-Mode Feedback Models
- Powerful Radio Emission From Low-mass Supermassive Black Holes Favors Disk-like Bulges