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DTSTART:20070311T020000
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DTSTAMP:20240924T142510
DTSTART;TZID=America/Detroit:20241003T153000
DTEND;TZID=America/Detroit:20241003T162000
SUMMARY:Lecture / Discussion:The Department of Astronomy 2024-2025 Colloquium Series Presents:
DESCRIPTION:\"Constraining cosmic history and cosmic-ray physics with radio emission\"\n\nThe peak in the cosmic star formation rate density—at z ~ 2—also marks the peak of  dust attenuation\, making the full census of star formation activity at short  wavelengths a measurement fraught with uncertainty. Fortunately\, radio emission  from normal galaxies—free-free emission of massive stars\, and synchrotron emission  of relativistic electrons shocked in the supernovae remnants of massive stars—is  entirely unaffected by dust. It is only now that our telescopes have the sensitivity to  constrain the star formation activity of populations of normal galaxies like our Milky  Way over nearly all cosmic time. My results reveal a discrepancy between  measurements of the SFRD at UV+IR wavelengths and at radio frequencies\,  indicating we may be missing over half of the total star formation\, even at redshifts as  low as z ~ 0.5. In this talk\, I will review ongoing and future plans to reveal the  source(s) of this discrepancy. I will also present recent work on how radio emission  from a nearby galaxy is illuminating the roles of cosmic-rays and magnetic fields in  the enrichment of the ISM and CGM.
UID:126892-21858094@events.umich.edu
URL:https://events.umich.edu/event/126892
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:astronomy,astrophysics
LOCATION:West Hall - 411
CONTACT:
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