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X-WR-CALNAME:Osservatorio Astrofisico di Catania
X-ORIGINAL-URL:https://www.oact.inaf.it
X-WR-CALDESC:Eventi per Osservatorio Astrofisico di Catania
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DTSTART:20250101T000000
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DTSTART;TZID=UTC:20250319T113000
DTEND;TZID=UTC:20250319T113000
DTSTAMP:20260407T232624
CREATED:20250304T175229Z
LAST-MODIFIED:20250305T075408Z
UID:17742-1742383800-1742383800@www.oact.inaf.it
SUMMARY:Status and future of 21-cm cosmology during the first billion years
DESCRIPTION:Recording: https://www.oact.inaf.it/seminars/ \nDATE:  Wednesday\, March 19\, 11:30 a.m. \nORGANIZER: INAF-OACT \nLOCATION: AULA OVEST (INAF-OACT) + remote \nLink for the remote audience:https://meet.google.com/wvf-uwxo-oyj \nSPEAKER: Prof. Andrei Mesinger (Scuola Normale Superiore\, Pisa) \nABSTRACT:The 21-cm hyperfine line of neutral hydrogen is set to revolutionize studies of the first billion years\, spanning the cosmic dawn of the first stars and eventual reionization of our Universe. I will discuss the potential of this probe in learning about the unknown astrophysics of the first galaxies as well as physical cosmology. Current upper limits on the cosmic 21-cm power spectrum already provide new insights into the heating of the intergalactic medium\, and the X-ray sources in the first galaxies. I will discuss the upcoming steps\, including the main challenges\, that will eventually lead to the Nobel prize-worthy 3D map of half of our observable Universe with the Square Kilometer Array (SKA) telescope.Our results show that a large scales we observe a continuous interplay between turbulence and gravity\, where the former creates structures at all scales and the latter takes the lead above a critical value of the surface density is reached\, ~ 0.1 g cm^-2. At the same time\, the fragmentation properties show several indications that the fragment are “clump-fed”\, i.e. the process is dynamical and the gravity dominates the collapse inside our massive clumps. \n  \nA few rules:— in case of large in-person attendance\, attendees may be asked to wear a face mask— before joining\, make sure you are using your institutional inaf.it account if you have one (otherwise we will grant you permission to join)— please do not forget to mute your microphone and switch off your webcam when access the virtual room— for questions leave a message in the chat\, the answers at the end of the webinar— the seminar will be recorded\, so if you are interested in it\, please contact us to get the link to the registration.
URL:https://www.oact.inaf.it/event/status-and-future-of-21-cm-cosmology-during-the-first-billion-years/
LOCATION:Sede A. Riccò\, Via Santa Sofia 78\, Catania
CATEGORIES:Eventi & Seminari
ATTACH;FMTTYPE=image/jpeg:https://www.oact.inaf.it/wp-content/uploads/2025/03/Seminario_mesinger.jpg
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