Speaker
Description
We are currently studying the evolution of the infrared-radio correlation (qIR) as a function of redshift (z) and stellar mass (M$_*$) for star-forming galaxies (SFGs) in the COSMOS field, using MIGHTEE Early Science data. Radio-detected galaxies selected down to a 2 μJy flux density limit are cross-matched with multi-wavelength data to classify radio AGN host galaxies and SFGs across 0 < z < 6. We calibrated the SFR-1.4 GHz radio luminosity (L$_{\rm 1.4~ GHz}$) relation for non-jetted AGN, radio-loud AGN (RL AGN), and SFGs. Non-jetted AGN shows a positive correlation with an average slope of 0.81, while RL AGN deviates significantly at L$_{\rm 1.4 ~GHz}$ > 10$^{23}$ W/Hz. At z < 0.5, radio emission in non-jetted AGN is dominated by star formation, resembling SFGs. However, at z > 0.5, the correlation flattens as far-infrared luminosity rises faster than radio luminosity. This suggests enhanced star formation in the early universe, with suppressed radio emission likely due to young stellar populations yet to produce supernova remnants. Further analysis is ongoing to refine these trends and explore their implications for galaxy evolution.
| Stream | Science |
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