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PRODID:-//Heidelberg University//HePhySTO//EN2026-07-07 23:49:37
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UID:ddfd705aac2d4fa63d10c077d95809a7@physik.uni-heidelberg.de
DTSTAMP:20260709T214937Z
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DESCRIPTION:The first macroscopic interstellar object (ISO) passing through
  our Solar System\, `Oumuamua\, was discovered in 2017 and caused a lot of 
 excitement\, due to both its novelty and its unexpected properties. The sub
 sequent two discoveries\, 2I/Borisov and 3I/ATLAS\, appear more like comets
 . 3I/ATLAS has been observable for most of the last year\, and as the first
  ISO seen in the JWST era has been well studied\, and appears to be an anci
 ent object that is significantly older than our Solar System. I will discus
 s what we have learned about the ISOs seen so far\, what the prospects are 
 for this field in the era of Rubin/LSST\, and how we could potentially send
  a spacecraft to see a future visitor up close. To arrange a visit with the
  speaker during the visit\, please contact their host: Markus Hundertmark\n
 \nImported from https://www.physik.uni-heidelberg.de/hephysto/ (no warranty
  for accuracy).
URL;VALUE=URI:https://www.physik.uni-heidelberg.de/hephysto/index.php?s=tal
 k&id=12474
SUMMARY:Heidelberg Joint Astronomical Colloquium: Colin Snodgrass   - The I
 nterstellar Visitors
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DTEND:20260721T153000Z
UID:7618f1a0eea7f058c86849e988a08bda@physik.uni-heidelberg.de
DTSTAMP:20260709T214937Z
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DESCRIPTION:The most distant luminous quasars\, now found up to redshifts z
 ~7.5\, are in many ways the most robust tools used by astronomers to study 
 the first billion years of our Universe. On the gigaparsec scales of the co
 smic web\, the Lyman-alpha forest in front of the first quasars gives us th
 e most precise measurement of reionisation's end at z=5.3. Soon\, advances 
 in ground-based instrumentation will also yield an accurate value for the p
 rocess' mid-point\, a crucial boundary condition on Cosmic Dawn. On galacti
 c scales\, quasar spectra capture metal absorbers from the circum-galactic 
 medium of faint early galaxies which cannot be detected in emission. Using 
 this approach\, I will present recent record-breaking observations of the m
 ost metal-poor galaxy detected to date: 11\,000 times more metal-poor than 
 the Sun\, it is the first "ultra" metal-poor galaxy\, and gives a fascinati
 ng glimpse of the properties of the first metal-poor stars. Finally\, the e
 xistence of quasars at z>7 is a tremendous mystery in itself: the supermass
 ive black holes powering them cannot easily grow from the remnants of the f
 irst stars. I will present cutting-edge observations from JWST which help e
 lucidate this mystery.\n\n\n\nImported from https://www.physik.uni-heidelbe
 rg.de/hephysto/ (no warranty for accuracy).
URL;VALUE=URI:https://www.physik.uni-heidelberg.de/hephysto/index.php?s=tal
 k&id=12475
SUMMARY:Heidelberg Joint Astronomical Colloquium: Sarah Bosman - Distant Qu
 asars: The Observational Key to the Formation of Structure Across Scales
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