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SUMMARY:Brian Welch: Exploring the distant universe at small scales with g
 ravitational lensing
DTSTART:20260602T111500Z
DTEND:20260602T120000Z
DTSTAMP:20260530T051900Z
UID:indico-event-9637@indico.fysik.su.se
CONTACT:alexander.burgman@fysik.su.se\;azadeh.fattahi@fysik.su.se
DESCRIPTION:The Hubble Space Telescope (HST) and James Webb Space Telescop
 e (JWST) together offer an unprecedentedly detailed view of galaxies acros
 s cosmic time\, from the first few hundred million years after the Big Ban
 g through today. However\, even these powerful telescopes struggle to reso
 lve the small-scale building blocks of galaxies in the distant universe. G
 ravitational lensing provides an extra boost to the resolving power of HST
  and JWST\, using massive galaxy clusters in the foreground as cosmic tele
 scopes to magnify distant galaxies. In this talk\, I will discuss how the 
 combination of HST\, JWST\, and gravitational lensing provides a window in
 to the heart of distant galaxies\, revealing compact star clusters that ar
 e key engines of evolution within galaxies. I will highlight how lensed ga
 laxies provide a unique view of star formation and quenching within galaxi
 es\, allowing us to see both actively star-forming regions and quiescent r
 egions side-by-side in galaxies in the distant universe. And I will discus
 s how lensed galaxies allow us to pinpoint the stellar populations driving
  chemical evolution in galaxies\, connecting young massive star clusters w
 ith the abundances of elements in their surrounding HII regions.\nAbout th
 e speaker: Currently I am a research fellow at the International Space Sc
 ience Institute (ISSI) in Bern\, Switzerland. When I'm not doing science\,
  I enjoy exploring the mountains of Switzerland on skis\, bike\, or by foo
 t depending on the season.Before starting at ISSI\, I was a postdoctoral r
 esearcher employed by the University of Maryland\, College Park\, working 
 at NASA Goddard Space Flight Center through the CRESST II cooperative agre
 ement.I did my PhD at Johns Hopkins University\, working with both Dan Coe
  (at the Space Telescope Science Institute\, across the street from JHU)\,
  and Stephan McCandliss. My PhD primarily focused on exploring the small-s
 cale details of distant galaxies using the combined power of the Hubble Sp
 ace Telescope and gravitational lensing\, but in the early years I also da
 bbled in launching sub-orbital sounding rockets.Prior to starting at JHU\,
  I got my B.A. in Physics at the University of Chicago.\nIn the OKC: Alba
 Nova C6:3025\n\nhttps://indico.fysik.su.se/event/9637/
LOCATION:FB54 (AlbaNova Main Building)
URL:https://indico.fysik.su.se/event/9637/
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