Friday, November 10, 2023 at 12:15 pm

JILA Foothills Room

Allison Matthews, Carnegie Observatory

"Confirmation of a Discrepancy between Radio and UV–IR Measures of the SFRD"

Abstract:

Five years ago, the MeerKAT telescope in South Africa produced the deepest radio image to date (DEEP2), and with it we measured radio source counts down to 0.25 microJy, equivalent to the flux density of a Milky Way-like galaxy at a redshift of 4. The resulting cosmic star- formation rate density (SFRD) derived from our evolutionary models—and an updated FIR/radio correlation—implies that star-forming galaxies evolved more strongly than published inferences from UV and IR data. Using a spectrophotometric technique combining coarse optical spectra with broadband photometry, we have obtained redshifts with <1% fractional uncertainty in (1+z). The radio luminosity functions between 0.2

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