Coffee talks
Friday 19/01/2024 @ 11:30, Sala riunioni quarto piano e on-line (meet.google.com/sue-bwvk-axf)
Gianfranco De Zotti (INAF - OAPd), "On the redshift dependence of the correlation between star-formation rate and radio luminosity"
I will argue that the different infrared-to-radio luminosity ratio between local and high-redshift star-forming galaxies reflects the different morphology, hence the different magnetic field configurations, of the dominant population of star-forming galaxies in different redshift ranges. "Normal" late-type galaxies dominate the star formation in the nearby universe; starburst galaxies take over at higher redshifts, up to z ~ 1.5, while proto-spheroidal galaxies dominate at still higher redshifts. A re-analysis of data on the COSMOS field combined with literature results shows that, for each population, the data are consistent with a redshift-independent parameter q_IR, quantifying the infrared/radio correlation. Higher values of q_IR found for high-z strongly lensed dusty galaxies selected at 500 micron might be accounted for in terms of differential magnification.