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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:20230101T000000
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BEGIN:VEVENT
DTSTART;TZID=UTC:20260520T113000
DTEND;TZID=UTC:20260520T123000
DTSTAMP:20260514T080850Z
CREATED:20260514T080847Z
LAST-MODIFIED:20260514T080850Z
UID:19680-1779276600-1779280200@www.oact.inaf.it
SUMMARY:The Nature of Polarized Sources in the MIGHTEE XMM-LSS Deep Field
DESCRIPTION:Recording: NOT AVAILABLE \nDATE: Wednesday\, May 20\, 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: Lennart Heino (INAF) \nABSTRACT:This study explores the polarized emission of the faint extragalactic radio sources in the MIGHTEE (MeerKAT International Giga-Hertz Tiered Extragalactic Exploration\, Jarvis et al.\, 2016) survey in order to systematically study cosmic magnetic fields in galaxies to high redshift. Reaching a sensitivity of 1.5 µJy/beam at a resolution of 5 arcseconds\, MIGHTEE is providing an opportunity to chart the evolution of polarized emission from distant galaxies over cosmic time. \nThe MIGHTEE survey detects polarized emission for a large number of radio sources down to total intensity flux densities of the order of 100 µJy. At these flux densities the source population is increasingly dominated by star-forming galaxies (SFGs) as opposed to active galactic nuclei (AGNs). While polarized emission of AGN can be traced to very distant galaxies\, polarized emission of SFGs at moderate distance has been detected only once. \nI use multi-wavelength criteria to classify MIGHTEE radio objects as either SFG or AGN. I perform Rotation Measure Synthesis (RMSY) on the spectro-polarimetric data cubes and use the polarization and RMSY spectra to search for polarized emission. A comparative analysis of the polarization properties of SFGs and AGNs is performed. The analysis is extended to the lowest possible flux densities using stacking techniques. I will show preliminary results of the MeerKAT polarization studies of radio sources down to a sensitivity at the micro-Jansky level. \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 \n 
URL:https://www.oact.inaf.it/event/the-nature-of-polarized-sources-in-the-mightee-xmm-lss-deep-field/
LOCATION:Sede A. Riccò\, Via Santa Sofia 78\, Catania
CATEGORIES:Eventi & Seminari
ATTACH;FMTTYPE=image/png:https://www.oact.inaf.it/wp-content/uploads/2026/05/cover-slide.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20260227T111500
DTEND;TZID=UTC:20260227T123000
DTSTAMP:20260224T114110Z
CREATED:20260224T095744Z
LAST-MODIFIED:20260224T114110Z
UID:19458-1772190900-1772195400@www.oact.inaf.it
SUMMARY:The EWOCS view of supermassive stellar clusters
DESCRIPTION:Recording: https://www.oact.inaf.it/seminars/ \nDATE: Friday\, February 27\, 11:15 a.m. \nORGANIZER: INAF-OACT \nLOCATION: AULA OVEST (INAF-OACT) + remote \nLink for the remote audience:https://meet.google.com/wvf-uwxo-oyj \nSPEAKER: M. G. Guarcello and the EWOCS Team \nABSTRACT:Star formation in our Galaxy typically occurs in environments less massive than 10^4 solar masses. However\, a few more extreme star forming environments on the Milky Way exist\, where hundreds of thousands to millions of stars form in dense regions. Often called “supermassive star clusters”\, they are rare in our Galaxy today\, while they are common in galaxies experiencing epochs of starburst. The international project EWOCS (Extendend Westerlund 1 and 2 Open Clusters Survey) is targeting the two closest superstar clusters in the Milky Way with a multi-wavelengtht survey which is based on an extensive set of data from radio to X-rays\, with the main objective of studying the formation and early evolution of stars over the whole mass spectrum in a starburst environment.In this talk\, I will discuss the motivations and objectives of the project\, the published results\, ongoing studies and the future developments. \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/the-ewocs-view-of-supermassive-stellar-clusters/
LOCATION:Sede A. Riccò\, Via Santa Sofia 78\, Catania
CATEGORIES:Eventi & Seminari
ATTACH;FMTTYPE=image/jpeg:https://www.oact.inaf.it/wp-content/uploads/2026/02/Locandina-evento-EWOCS-OACT.jpg
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BEGIN:VEVENT
DTSTART;TZID=UTC:20250929T110000
DTEND;TZID=UTC:20250929T120000
DTSTAMP:20250927T182741Z
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
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20250319T113000
DTEND;TZID=UTC:20250319T113000
DTSTAMP:20250305T075408Z
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
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20240722T110000
DTEND;TZID=UTC:20240722T120000
DTSTAMP:20240719T141620Z
CREATED:20240719T141616Z
LAST-MODIFIED:20240719T141620Z
UID:16589-1721646000-1721649600@www.oact.inaf.it
SUMMARY:Galactic Archaeology: decoding the fossil record of Galaxy formation and evolution
DESCRIPTION:Recording: https://www.oact.inaf.it/seminars/ \nDATE:  Monday\, July 22\, 11:00 a.m. \nORGANIZER: DFA UNICT \nLOCATION: AULA OVEST (INAF-OACT) + remote \nLink for the remote audience:https://meet.google.com/wvf-uwxo-oyj \nSPEAKER: Dott. Santi Cassisi\, INAF-Osservatorio Astronomico d’Abruzzo \nABSTRACT:One of most important issue in Astrophysics is the achievement of a robust understanding of the sequence of processes that contributed to the building up of the Milky Way. This is obviously important not only “on a local scale” in order to recover the history of formation and evolution of the Galaxy\, but also\, more in general\, for understanding the formation process of spiral galaxies. In the last decade\, the advent of high precision photometric and spectroscopic surveys as well as the possibility to estimate\, thanks to the ESA Gaia mission\, accurate distance for a huge number of field stars\, combined with the development of an accurate theoretical framework\, is actually opening a new era for this kind of investigations.We will present some recent results – obtained by using this updated observational and theoretical framework – about the formation and early evolution of the Milky Way. \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/galactic-archaeology-decoding-the-fossil-record-of-galaxy-formation-and-evolution/
LOCATION:Sede A. Riccò\, Via Santa Sofia 78\, Catania
CATEGORIES:Eventi & Seminari
ATTACH;FMTTYPE=image/jpeg:https://www.oact.inaf.it/wp-content/uploads/2024/07/Cassisi_11luglio.jpg
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