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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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BEGIN:VEVENT
DTSTART;TZID=UTC:20260310T113000
DTEND;TZID=UTC:20260310T123000
DTSTAMP:20260426T160522
CREATED:20260309T084132Z
LAST-MODIFIED:20260309T084700Z
UID:19489-1773142200-1773145800@www.oact.inaf.it
SUMMARY:Our Universe in Simulation
DESCRIPTION:Recording: https://www.oact.inaf.it/seminars/ \nDATE: Tuesday\, March 9\, 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: Jia Liu (Kavli IPMU – University of Tokyo) \nABSTRACT:Ongoing and upcoming cosmological surveys—including the Simons Observatory\, LiteBIRD\, Rubin LSST\, Euclid\, DESI\, PSF\, SPHEREx\, and the Roman Space Telescope—will deliver observations of unprecedented precision. Joint analyses across these surveys will be essential for uncovering fundamental physics\, including the nature of inflation\, dark energy\, dark matter\, neutrino mass\, and more. In this talk\, I will discuss the opportunities\, challenges\, and strategies for simulating our universe across multiple wavelengths to realize these goals. \n  \nA few rules:— 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. \n 
URL:https://www.oact.inaf.it/event/our-universe-in-simulation/
LOCATION:Sede A. Riccò\, Via Santa Sofia 78\, Catania
CATEGORIES:Eventi & Seminari
ATTACH;FMTTYPE=image/jpeg:https://www.oact.inaf.it/wp-content/uploads/2026/03/seminario_Liu.jpg
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BEGIN:VEVENT
DTSTART;TZID=UTC:20250929T110000
DTEND;TZID=UTC:20250929T120000
DTSTAMP:20260426T160522
CREATED:20250915T101627Z
LAST-MODIFIED:20250927T182741Z
UID:18701-1759143600-1759147200@www.oact.inaf.it
SUMMARY:The Fossil Groups puzzle: ancient relics or young pretenders?
DESCRIPTION:Recording: https://www.oact.inaf.it/seminars/ \nDATE: Monday\, September 29\, 11:00 a.m. \nORGANIZER: INAF-OACT \nLOCATION: AULA OVEST (INAF-OACT) + remote \nLink for the remote audience:https://meet.google.com/wvf-uwxo-oyj \nSPEAKER: Stefano Zarattini (Centro de Estudios de Física del Cosmos de Aragón – CEFCA) \nABSTRACT:Fossil groups (FGs) were initially believed to represent the end stage of galaxy group evolution\, characterised by a significant luminosity gap between their two brightest member galaxies which was seen as an indicator of their advanced age. In this picture\, FGs were thought to undergo a long passive evolution in which their bright satellites gradually merged into the central galaxy\, making them fossil relics of the ancient Universe. However\, results from the Fossil Group Origins (FOGO) project suggest a paradigm shift: FGs are not necessarily old\, but rather isolated systems whose location within the cosmic web primarily regulates their evolution. In this scenario\, the magnitude gap arises at low redshift thanks to the infall of galaxies on radial orbits\, which enhances the merging rate observed in FGs. \nIn this seminar\, I will review the progress achieved over the last 15 years that led to this new interpretation. I will discuss the luminosity functions\, substructures\, cosmic web environment\, and orbital distribution of FG galaxies\, also highlighting the view of FGs as transitional systems. Numerical simulations will also be presented to support the observational evidence\, reinforcing the idea that the magnitude gap is a relatively recent feature rather than the imprint of an early formation epoch. \n  \nA few rules:— 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/the-fossil-groups-puzzle-ancient-relics-or-young-pretenders/
LOCATION:Sede A. Riccò\, Via Santa Sofia 78\, Catania
CATEGORIES:Eventi & Seminari
ATTACH;FMTTYPE=image/jpeg:https://www.oact.inaf.it/wp-content/uploads/2025/09/Captura-de-pantalla-2025-09-15-a-las-10.08.26.jpg
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BEGIN:VEVENT
DTSTART;TZID=UTC:20250414T110000
DTEND;TZID=UTC:20250414T120000
DTSTAMP:20260426T160522
CREATED:20250412T163324Z
LAST-MODIFIED:20250412T163327Z
UID:17962-1744628400-1744632000@www.oact.inaf.it
SUMMARY:Elucidating diffuse Galactic synchrotron emission for precision 21cm and CMB cosmology
DESCRIPTION:Recording: https://www.oact.inaf.it/seminars/ \nDATE: Monday\, April 14\, 11:00 a.m. \nORGANIZER: INAF-OACT \nLOCATION: AULA OVEST (INAF-OACT) + remote \nLink for the remote audience:https://meet.google.com/wvf-uwxo-oyj \nSPEAKER: Dr. Melis O. Irfan (IoA\, University of Cambridge) \nABSTRACT:The next generation of Cosmic Microwave Background experiments are poised to probe the inflationary period of the Universe through the measurement of primordial B-modes\, whilst 21cm experiments are observing the reionization history of the early Universe and formation of Large-Scale Structure through the mapping of neutral hydrogen. These two complementary fields span the radio to microwave frequency regimes and share a pivotal data reduction task: foreground component separation.Diffuse Galactic synchrotron emission is the dominant foreground for arcmin/degree scale cosmological surveys operating across MHz frequencies in intensity\, and at all frequencies under 60 GHz in polarised intensity. In this talk I will present measurements of the synchrotron spectral index and curvature between 73 MHz and 1 GHz through the combined use of pilot MeerKLASS\, Haslam\, Maipu/MU and LWA data. I will discuss the advances that can be made to component separation algorithms thanks to more sophisticated foreground emission modelling and will present a spatially complex\, all-sky model of the synchrotron spectral index formed using convolutional neural networks trained on sets of both high- and low-resolution empirical data. Such advances will\, and already are\, expanding our understanding of the spatial and spectral form of this complex emission; ameliorating component separation for both CMB and 21cm intensity mapping experiments. \n  \nA few rules:— 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/elucidating-diffuse-galactic-synchrotron-emission-for-precision-21cm-and-cmb-cosmology/
LOCATION:Sede A. Riccò\, Via Santa Sofia 78\, Catania
CATEGORIES:Eventi & Seminari
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