Lunch talk on Jan. 7, 2025

Radio continuum surveys in the SKA era: source classification and radio spectral properties

Speaker: Fangxia An (PMO)

Venue: SWIFAR Building 2111

Time: 12:45 PM, Tuesday, Jan. 7, 2025

Abstract: 

The high-sensitivity, wide-field extragalactic radio continuum surveys conducted by facilities such as MeerKAT, ASKAP, and the future Square Kilometre Array (SKA) are revolutionizing our ability to explore cosmic evolution. To fully exploit this data, fast, automated methods, including machine learning, are becoming crucial. In this presentation, I will outline our machine-learning approach to classifying star-forming galaxies (SFGs) and active galactic nuclei (AGN) in radio continuum surveys. I will then introduce two of our recent projects based on radio continuum data from MeerKAT+VLA+GMRT in the COSMOS field and LOFAR+GMRT+VLA in the ELAIS-N1 field, with a focus on the radio spectral properties of SFGs. I will discuss the physical mechanisms that shape the radio spectra of SFGs, highlighting key correlations between radio spectra and the physical properties of these galaxies. Furthermore, I will demonstrate the significant impact of using different radio spectral indices (from both low- and high-frequency ranges) in k-corrections, particularly in studies of the far-infrared-radio correlation of SFGs, which are key to broader investigations of cosmic evolution through radio continuum emission.

Report PPT:  SWIFAR_Fangxia An.pdf