Probing the Infrared/Radio correlation of the full IRAS Revised Bright Galaxy Sample with MeerKAT and the VLA

Abstract

We study the infrared/radio correlation of galaxies in the IRAS Revised Bright Galaxy Sample using new MeerKAT observations at $\nu =1.28\mathrm{GHz}$, complemented with VLA data. We classify the objects by primary energy source (Active Galactic Nuclei vs. Star-Forming) and take into account their merger status. With this, we aim to explore the effect of galaxy-galaxy interaction on the total-infrared (TIR)/radio correlation ($q_{\mathrm{TIR}}$) of star-forming galaxies by comparing the $q_{\mathrm{TIR}}$ distribution between isolated and interacting/merging sources. We found the median $q_{\mathrm{TIR}}$ to be $2.61\pm 0.01$ (scatter = 0.16) for isolated galaxies and $2.51\pm 0.08$ (scatter = 0.26) for interacting/merging galaxies. Our analysis reveals that interacting/merging galaxies exhibit lower $q_{\mathrm{TIR}}$ and higher dispersion compared to isolated galaxies, and the difference is marginally significant. Interacting/merging galaxies have redder $W2-W3$ colours, higher star formation rates (SFR) and specific SFR compared to isolated objects. We observe a significant decrease in $q_{\mathrm{TIR}}$ with increasing radio luminosity for isolated galaxies. Additionally, we find the median ratio of TIR ($8\mu m<\lambda <1000\mu m$) to far-infrared (FIR; $40\mu m<\lambda <120\mu m$) luminosities to be $⟨L_{\mathrm{TIR}}/L_{\mathrm{FIR}}⟩\approx 2.29$. By examining the relation between $L_{\mathrm{TIR}}$ and the mid-infrared (MIR) star-formation rate indicator ($L_{12\mu \mathrm{m}}$) employed for our interacting/merging sample, we note a strong and consistent (similar non-linear behaviour) relationship between the TIR/radio and TIR/MIR ratios. Finally, we show that already at $z<0.1$, $q_{\mathrm{TIR}}$ exhibits a dependence on stellar mass, with more massive galaxies displaying a lower $q_{\mathrm{TIR}}$.

This manuscript is 26 pages long and contains 16 figures and 3 tables. The data are provided in machine-readable format on Zenodo at https://doi.org/10.5281/zenodo.16889781. The paper was accepted for publication in the Monthly Notices of the Royal Astronomical Society Main Journal on 26 August 2025, ref. MN-24-1207-MJ.R3

References in corpus (39)

• Cosmic Star Formation History
• The effect of galaxy mass ratio on merger--driven starbursts
• Kinematic Structure of Merger Remnants
• The Main Sequence of star-forming galaxies across cosmic times
• The Coincidence of Nuclear Star Clusters and Active Galactic Nuclei
• Dust temperature and mid-to-total infrared color distributions for star-forming galaxies at 0<z<4
• Galaxy Interactions Trigger Rapid Black Hole Growth: an unprecedented view from the Hyper Suprime-Cam Survey
• The Galaxy Activity, Torus and Outflow Survey (GATOS) I. ALMA images of dusty molecular tori in Seyfert galaxies
• The mass of the black hole in Centaurus A from SINFONI AO-assisted integral-field observations of stellar kinematics
• The infrared-radio correlation of star-forming galaxies is strongly M${}_{\star }$-dependent but nearly redshift-invariant since z$\sim$4
• Deep Extragalactic VIsible Legacy Survey (DEVILS): SED Fitting in the D10-COSMOS Field and the Evolution of the Stellar Mass Function and SFR-$M_{\star }$ relation
• The WISE Extended Source Catalogue (WXSC) I: The 100 Largest Galaxies
• Modelling the spectral energy distribution of ULIRGs II: The energetic environment and the dense interstellar medium
• Galaxy and Mass Assembly (GAMA): Exploring the WISE Cosmic Web in G12
• The opaque nascent starburst in NGC 1377: Spitzer SINGS observations
• The non-linear infrared-radio correlation of low-z galaxies: implications for redshift evolution, a new radio SFR recipe, and how to minimize selection bias
• The Nature of Infrared Emission in the Local Group Dwarf Galaxy NGC 6822 As Revealed by Spitzer
• Infrared 3-4 Micron Spectroscopy of Infrared Luminous Galaxies with Possible Signatures of Obscured Active Galactic Nuclei
• AGN feedback in a galaxy merger: Multi-phase, galaxy-scale outflows including a fast molecular gas blob ~6 kpc away from IRAS F08572+3915
• A comparison of the morphological properties between local and z~1 infrared luminous galaxies. Are local and high-z (U)LIRGs different?
• Galaxy and Mass Assembly (GAMA): Demonstrating the power of WISE in the study of Galaxy Groups to $z<0.1$
• Connections between galaxy mergers and Starburst: evidence from local Universe
• Gemini NIFS survey of feeding and feedback in nearby Active Galaxies -- IV. Excitation
• Cosmic Star-Formation History Measured at 1.4 GHz
• Broad-line region in NGC 4151 monitored by two decades of reverberation mapping campaigns. I. Evolution of structure and kinematics
• ALMA resolves the remarkable molecular jet and rotating wind in the extremely radio-quiet galaxy NGC 1377
• Energetic nuclear transients in luminous and ultraluminous infrared galaxies
• A Multiwavelength Study of Active Galactic Nuclei in Post-Merger Remnants
• Characterizing Compact 15-33 GHz Radio Continuum Sources in Local U/LIRGs
• Exploring the Impact of Galactic Interactions and Mergers on the Central Star Formation of APEX/EDGE-CALIFA Galaxies
• Magnetic fields during galaxy mergers
• Metal-THINGS: On the metallicity and ionization of ULX sources in NGC 925
• Galaxy and Mass Assembly (GAMA): A $\text{WISE}$ study of the activity of emission-line systems in G23
• Investigating the nature of the ultraluminous X-ray sources in the galaxy NGC 925
• Connecting MeerKAT radio continuum properties to GAMA optical emission-line and WISE mid-infrared activity
• The far-infrared/radio correlation for a sample of strongly lensed dusty star-forming galaxies detected by Herschel
• Warm Molecular Gas in the Central Parsecs of the Buried Nucleus of NGC 4418 Traced with the Fundamental CO Ro-vibrational Absorptions
• Classification of local ultraluminous infrared galaxies and quasars with kernel principal component analysis
• The infrared-radio relation in the local universe

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