Speaker
Description
Understanding what drives the observed correlation between total infrared and GHz-radio emission in galaxies ("infrared-radio correlation", IRRC) is a major quest in extra-galactic astronomy, in order to calibrate radio emission as a star formation rate (SFR) indicator. We have recently calibrated the IRRC in the COSMOS field by exploiting deep VLA and MeerKAT continuum surveys, combined with exquisite multi-wavelength ancillary data. Starting from a sample of $>$400,000 star-forming galaxies selected in stellar mass (M$_{\star}$), we investigate how the IRRC varies as a function of both M$_{\star}$ and redshift, out to z$\sim$4. We stack deep radio and infrared images in different (M$_{\star}$, z) bins, carefully removing radio-excess AGN candidates via a recursive approach. We find that more massive galaxies are radio brighter at fixed infrared luminosity than less massive counterparts, at all redshifts. I will discuss possible physical interpretations of these findings. Our study provides a leap forward in understanding the radio-SFR relation at different M$_{\star}$ and cosmic epochs, which will prove crucial in future ultra-deep SKA surveys to convert radio detections into accurate SFR measurements.
| Reasearch area | Extragalactic Continuum (galaxies/AGN, galaxy clusters) |
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