Fermi-LAT data shows gamma-ray emission from low-luminosity AGN with the subthreshold population signal consistent with star-formation dominance and individually detected sources likely powered by jets via synchrotron self-Compton emission under weakly magnetized particle-dominated conditions.
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A radio-luminosity-based model of mild q decrease to z~2 from cosmic ray losses mitigates the >3σ discrepancy in MeerKAT source counts near 10 μJy with ≥2σ evidence, while bounding intrinsic scatter.
SEMPER predicts SKA-Mid Band 2 observations in under 20 hours will recover at least 20% of the total SFRD from radio-emitting SFGs up to z≈6, including NIR-dark galaxies.
Simulations of an SKA-Mid survey predict detection of 1.5e4 star-forming galaxies to z~7 with thermal SFR uncertainties of 0.1 dex, enabling constraints on cosmic star formation rate density.
Multi-scale radio observations of 15 local U/LIRGs decompose emission to show nuclear components contribute ~50% on average while diffuse SF-related emission dominates ~80% of total power, with radio excess linked to AGN rather than boosted star formation.
JWST finds infrared counterparts for nearly all micro-Jy radio sources, with star formation explaining the radio output in roughly 79% of cases after accounting for non-linear luminosity relations.
Simulations predict ngVLA at 100 GHz can detect galaxies above 10^9 solar masses at any redshift while SKA low frequencies reach massive dusty galaxies to z=5-7.
Dwarf galaxies host compact thermal HII regions powered by up to 100,000 O-type stars and exhibit radio variability consistent with AGNs.
In X-ray selected AGN, those hosting ultra-fast outflows exhibit larger radio extensions and steep spectra matching wind-driven shock models.
SKAO continuum surveys will detect radio emission from JWST AGN and LRDs and distinguish between Compton-thick absorption, intrinsically weak accretion, and dense gas cocoon scenarios.
SKA observations will separate star formation and AGN accretion contributions in nearby galaxies using spectral index maps and absorption features across multiple scales.
Simulated SKA-Mid surveys reach radio-AGN completeness at L_1.4GHz ~ 10^23 W Hz^-1 up to z~6.
Overview of how the SKAO will enable studies of star-forming galaxies, AGN co-evolution, and diffuse emission in clusters and the cosmic web using continuum radio observations.
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Characterizing the Gamma-ray Emission from Low-Luminosity AGN
Fermi-LAT data shows gamma-ray emission from low-luminosity AGN with the subthreshold population signal consistent with star-formation dominance and individually detected sources likely powered by jets via synchrotron self-Compton emission under weakly magnetized particle-dominated conditions.