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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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TZID:UTC
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DTSTART:20240101T000000
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BEGIN:VEVENT
DTSTART;TZID=UTC:20260520T113000
DTEND;TZID=UTC:20260520T123000
DTSTAMP:20260607T013428
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:20260310T113000
DTEND;TZID=UTC:20260310T123000
DTSTAMP:20260607T013428
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
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20250414T110000
DTEND;TZID=UTC:20250414T120000
DTSTAMP:20260607T013428
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
ATTACH;FMTTYPE=image/jpeg:https://www.oact.inaf.it/wp-content/uploads/2025/04/promo_page-0001.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20240212T113000
DTEND;TZID=UTC:20240212T120000
DTSTAMP:20260607T013428
CREATED:20240206T101354Z
LAST-MODIFIED:20240206T101358Z
UID:15576-1707737400-1707739200@www.oact.inaf.it
SUMMARY:Investigating the link between protoplanets\, disk substructures and disk winds
DESCRIPTION:Recording: https://www.oact.inaf.it/seminars/ \nDATE:  Monday\, February 12\, 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: Dr. Justyn Campbell-White (ESO-Garching) \nABSTRACT: \nProtoplanetary disks are now routinely observed around young stars but the planets they produce remain elusive to detect. So far\, we have only one confirmed direct detection of protoplanets in the disk of PDS 70\, with some tentative results (e.g. AB Aur). Yet disk structures are found almost ubiquitously across the sample of resolved disks. We are investigating the potential relationship between inner disk winds and outflows (traced by optical emission lines\, such as [OI])\, and the presence and type of disk substructures. We aim to determine whether or not the various substructures are the direct results of protoplanet formation. \nI will present new results from recent and archival observations of PDS 70. In order to investigate such connections between winds\, substructures and planets\, we turn to the one system where we have certainly detected the planets. We have carefully applied established techniques to the high-resolution spectra to reveal previously unseen forbidden emission profiles. These results suggest a significant wind originating from the inner disk. We compare these results and measurements of the mass accretion rate and disk properties to those of other weakly accreting young stars and those with transition disks. \nWe are also carrying out this investigation for the PENELLOPE/ULLYSES sample of ~80 young stars. This complements existing surveys of such winds/outflows\, whilst allowing for further exploration of the relation to disk substructures\, towards a more complete statistical survey. \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/investigating-the-link-between-protoplanets-disk-substructures-and-disk-winds/
LOCATION:Sede A. Riccò\, Via Santa Sofia 78\, Catania
CATEGORIES:Eventi & Seminari
ATTACH;FMTTYPE=image/jpeg:https://www.oact.inaf.it/wp-content/uploads/2024/02/JCW_INAF_02_2024_page-0001.jpg
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