Northwestern Events Calendar


Radio Astro Seminar: Jim Condon: The Star-formation History of the Universe

When: Thursday, May 25, 2023
12:00 PM - 1:00 PM CT

Where: Technological Institute, F160, 2145 Sheridan Road, Evanston, IL 60208 map it

Audience: Faculty/Staff - Student - Post Docs/Docs - Graduate Students

Contact: Samantha Westlake  

Group: Physics and Astronomy Radio Astronomy Seminars

Category: Academic


Abstract: The 1.4 GHz radio continuum emission from star-forming galaxies (SFGs) is primarily synchrotron radiation from electrons accelerated in the supernova remnants of short-lived (τ < 30 Myr) massive stars, making it a good tracer of current star formation that is unbiased by dust absorption and uncontaminated by older stellar populations. The local radio luminosity function of SFGs yields the star-formation rate density (SFRD) in the universe today. The radio sources in cosmologically distant SFGs are very weak, but the recent MeerKAT DEEP2 image has resolved > 96% of the SFG radio background into sources as faint as 0.25 microJy. Evolving the local radio luminosity function to match the DEEP2 faint-source counts yields an independent radio estimate of the star-formation history of the universe.

Speaker: Jim Condon, National Radio Astronomy Observatory

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