SAIP2025

The Evolution of the Infrared–Radio Correlation with Redshift and Stellar Mass for galaxies in the MIGHTEE COSMOS field.

Not scheduled

2h 50m

Solomon Mahlangu House (University of the Witwatersrand, Johannesburg)

Poster Presentation Track D1 - Astrophysics Poster Session

Speaker

Mrs Thando Kekana (University of Johannesburg)

Description

We investigate the evolution of the infrared–radio correlation (q$_{\rm IR}$) as a function of redshift (z) and stellar mass (M$_∗$ ) for star-forming galaxies (SFGs) in the COSMOS field, using MIGHTEE Early Science data. We use radio-detected galaxies with multi-wavelength counterparts to classify sources as radio-quiet AGN (RQ AGN), radio-loud AGN (RL AGN), and SFGs over the redshift range 0 < z < 6. We calibrate the star formation rate (SFR)–1.4 GHz radio luminosity (L$_{\rm 1.4~GHz}$ ) relation for both SFGs and RQ AGN. Both populations exhibit a positive correlation between SFR and L$_{\rm 1.4~GHz}$, and we find that RQ AGN have similar SFR–L$_{\rm 1.4~GHz}$ calibrations as SFGs. We further examine the evolution of q$_{\rm IR}$ (infrared-radio luminosity ratio) with redshift in different M$_∗$ bins. For high-mass galaxies (M$_∗$ >10$^{9.5}$ M$_⊙$ ), q$_{\rm IR}$ declines with increasing redshift and stellar mass due to enhanced magnetic fields in star-forming regions that elevated radio luminosities in massive star-forming galaxies.