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SUMMARY:Resolved Stellar Populations and Evolution of Star-Forming Metal-P
 oor Dwarf Galaxies
DTSTART:20260610T113000Z
DTEND:20260610T123000Z
DTSTAMP:20260617T195700Z
UID:indico-event-9519@indico.fysik.su.se
DESCRIPTION:Speakers: Giacomo Bortolini (Stockholm University)\n\nIn this 
 seminar\, I will present the research I have carried out during my PhD at 
 Stockholm University on the resolved stellar populations and star formatio
 n histories of metal-poor\, star-forming dwarf galaxies.\nDwarf galaxies (
 M < 10⁹ M☉) are not only the most common type of galaxy across cosmic 
 time\, but are also thought to be the fundamental building blocks of more 
 massive galaxies through hierarchical merging. Although they are not perfe
 ct analogues of their high-redshift counterparts\, dwarf galaxies within t
 he Local Volume (D < 20 Mpc) provide unique laboratories for studying star
  formation and chemical evolution in low-metallicity environments at high 
 spatial resolution. Thanks to the exquisite spatial resolution of the Hubb
 le Space Telescope (HST) in the ultraviolet and optical\, and the James We
 bb Space Telescope (JWST) in the near-infrared\, we can now resolve indivi
 dual stars in these systems across multiple wavelengths using point-spread
 -function fitting photometry. By constructing color–magnitude diagrams (
 CMDs) and comparing the observed stellar populations with predictions from
  state-of-the-art stellar evolution models\, we can estimate stellar ages 
 and masses\, and reconstruct how the star-formation rate has evolved over 
 time. In this sense\, stellar populations act as fossil records of galaxy 
 evolution\, much as archaeological artifacts reveal the history of human c
 ivilizations.\nI will present recent HST and JWST deep imaging of one of t
 he most metal-poor (Z ~ 3% Z☉) star-forming dwarf galaxy known in the ne
 arby Universe: I Zw 18\, a prime laboratory to study stellar evolution and
  feedback of young massive stars at extremely low metallicity. I will also
  present new NIRCam JWST imaging of the interacting dwarf galaxy pair NGC 
 4485/4490 and the irregular dwarf galaxy NGC 4449\, obtained as part of th
 e JWST cycle 1 program FEAST (Feedback in Emerging extrAgalactic Star clus
 Ters\, PI: A. Adamo). I will show how we can probe the stellar populations
  of these galaxies at an unprecedented level of detail given their distanc
 e from us (d > 4 Mpc)\, and how to reconstruct their star-formation histor
 ies across cosmic time throgh CMD modelling.\n\nhttps://indico.fysik.su.se
 /event/9519/
LOCATION:FC61 (AlbaNova Main Building)
URL:https://indico.fysik.su.se/event/9519/
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