Title: Radio Spectral Properties of Star-Forming Galaxies Based on the SKA Pathfinders Radio Continuum Surveys

Speaker: Dr. Fangxia An (University of the Western Cape，South Africa)

Time: 10:30-11:30, January 11, 2022

Location: 5-516, PMO Xianlin Campus

Abstract: A well-determined radio spectrum for star-forming galaxy (SFG) is critically important for studies that are based on rest-frame radio power, especially those at high-redshift where k-corrections are generally extrapolated the most. In this talk, I will introduce two of our recently completed projects based on the MeerKAT+VLA+GMRT (SKA pathfinders) data in the COSMOS field and the LOFAR+GMRT+JVLA data in the ELAIS-N1 field. I will present our measured radio spectral indices between the observer-frame frequencies of 150-400, 400-610, 400-1300MHz, 1.3-3GHz, and 610-5000MHz and show the correlations between radio spectrum and physical properties of radio-selected SFGs. With these results, I will discuss the possible physical mechanisms that determine the radio spectrum of SFGs. I will also show how the adoption of these different radio spectral indices (from low- and high-frequency) in k-correction affects the study of far-infrared-radio correlation of SFGs.

I will also introduce the MIGHTEE (MeerKAT International GHz Tiered Extragalactic Exploration) project and super-MIGHTEE, ？which combines the MeerKAT and uGMRT telescopes to observe the MIGHTEE survey regions at 0.5–2.7 GHz with the same angular resolution (～5 arcsec) and similar sensitivities. I will present the preliminary results from some of our ongoing work based on these two large survey projects.