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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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BEGIN:VEVENT
DTSTART;TZID=UTC:20250930T110000
DTEND;TZID=UTC:20250930T120000
DTSTAMP:20260419T000835
CREATED:20250926T084534Z
LAST-MODIFIED:20250926T084537Z
UID:18772-1759230000-1759233600@www.oact.inaf.it
SUMMARY:The next-generation Very Large Array: Project Summary and Update
DESCRIPTION:Recording: https://www.oact.inaf.it/seminars/ \nDATE: Tuesday\, September 30\, 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. Eric J. Murphy (NRAO) \nABSTRACT:Inspired by dramatic discoveries from the Jansky VLA\, VLBA\, and ALMA\, a large collecting area radio interferometer that will open new discovery space from proto-planetary disks to distant galaxies is being designed by the U.S. National Radio Astronomy Observatory (NRAO) and the broad scientific and technical communities.  The next-generation VLA (ngVLA)\, which was strongly endorsed by the Astro2020 Decadal Survey as an essential research facility whose construction should begin this decade\, is envisaged as an interferometric array with ten times greater sensitivity and spatial resolution than the current VLA and ALMA\, operating in the frequency range of 1.2 – 116 GHz.  Replacing both the VLA and VLBA\, the ngVLA will be optimized for observations in the spectral region between the superb performance of ALMA at mm and sub-mm wavelengths\, and the future Phase I Square Kilometer Array (SKA-1) at decimeter-scale and longer wavelengths.  As such\, the ngVLA will uniquely tackle a broad range of outstanding scientific questions in modern astronomy by simultaneously delivering the capability to: unveil the formation of Solar System analogues on terrestrial scales; probe the initial conditions for planetary systems and life with astrochemistry; characterize the assembly\, structure\, and evolution of galaxies from the first billion years to the present; use pulsars in the Galactic center as fundamental tests of gravity; and understand the formation and evolution of stellar and supermassive blackholes in the era of multi-messenger astronomy.  In this presentation\, I will provide a project update and discuss the overall science case that led to the current technical design of the ngVLA. \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-next-generation-very-large-array-project-summary-and-update/
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/Title.jpg
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DTSTART;TZID=UTC:20250430T110000
DTEND;TZID=UTC:20250430T120000
DTSTAMP:20260419T000835
CREATED:20250428T210420Z
LAST-MODIFIED:20250428T210924Z
UID:18011-1746010800-1746014400@www.oact.inaf.it
SUMMARY:Precision Meter-wavelength Polarimetry with the Very Large Array
DESCRIPTION:Recording: https://www.oact.inaf.it/seminars/ \nDATE: Wednesday\, April 30\, 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: Rick Perley (National Radio Astronomy Observatory – USA) \nABSTRACT:Accurate imaging polarimetry at meter wavelengths requires removal of the highly variable ionospheric Faraday rotation (IFRM) with an accuracy of 0.1 rad/m^2 or better. Models to estimate the VTEC using GNSS timing data\, combined with global terrestrial magnetic field models have been developed over the past 25 years.  Estimating the accuracy of these models requires observations of a source of known intrinsic electric vector position angle (EVPA) over a wide rage of ionospheric conditions.Using eight VLA polarimetric observations of the moon spanning ten years using the VLA’s P-band (295 — 445 MHz) receivers\, we have tested the accuracy of seven global IONEX models produced by the AIPS program TECOR\, and the regional model derived by ALBUS.All seven global models overestimate the IFRM\, typically by 0.5 to 1.0 rad/m^2 — a value which remains constant over many hours\, including day — night transitions.  The ‘ALBUS’ model\, which uses GNSS ground station data within ~300 km of the requested site\, generates predictions which are always the closest — usually with 0.2 rad/m^2— to the observed values. \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/precision-meter-wavelength-polarimetry-with-the-very-large-array/
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/Locandine-eventi-OACT-2.jpg
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