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X-WR-CALDESC:Eventi per Osservatorio Astronomico di Roma
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BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20191203T114500
DTEND;TZID=Europe/Rome:20191203T124500
DTSTAMP:20260407T223825
CREATED:20190723T160231Z
LAST-MODIFIED:20191201T160753Z
UID:6544-1575373500-1575377100@www.oa-roma.inaf.it
SUMMARY:Acoustic oscillations and dynamo action in giants
DESCRIPTION:The role of the magnetic field in determining the angular momentum  transport in stellar interior is still an open issue. Acoustic oscillations are directly affected by the presence of a large-scale magnetic field but their study can provide fundamental information on the properties of the magnetic fields in solar-like stars. As an example the case of  EK Eridani\, a slowly rotating\, overactive G8 giant\, will be presented.  Moreover the possibility to use asteroseismology to solve the  long-lasting mystery on the origin of magnetic fields in Ap stars will be discussed.
URL:https://www.oa-roma.inaf.it/event/alfio-bonanno-colloquium/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20191210T114500
DTEND;TZID=Europe/Rome:20191210T124500
DTSTAMP:20260407T223825
CREATED:20190723T112945Z
LAST-MODIFIED:20191204T155611Z
UID:6537-1575978300-1575981900@www.oa-roma.inaf.it
SUMMARY:Characterizing multi-phase gas outflows and their powering mechanism in nearby AGN
DESCRIPTION:Active Galactic Nuclei are thought to play a crucial role in\nthe evolution of massive galaxies. In particular\, fast outflows are\nfrequently observed in AGN covering various gas phases which may remove\na significant fraction of the gas content from the galaxies. I will\nreview the current state of research in this very active field of\nongoing research together with the advantages and disadvantages of\nprevious approaches. In particular\, I will highlight the importance of\nmulti-wavelength observations to unravel the true multi-phase nature of\noutflows by combining state-of-the-art observational facilities. In this\ncontext I will present the first results from the ongoing Close AGN\nReference Survey (CARS)\, a multi-wavelength survey of 39 luminous\nlow-redshift unobscured AGN with extensive observations from VLT/MUSE\,\nALMA\, VLA\, Chandra\, SOFIA and many more. In addition\, I will present the\nmulti-phase view of the famous ultra-luminous Quasar 3C273 where we\nunlocked a few unknown secrets.
URL:https://www.oa-roma.inaf.it/event/colloquium-bernd-husemann/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20191218T114500
DTEND;TZID=Europe/Rome:20191218T124500
DTSTAMP:20260407T223825
CREATED:20191201T160620Z
LAST-MODIFIED:20191212T083130Z
UID:7142-1576669500-1576673100@www.oa-roma.inaf.it
SUMMARY:Gamma-ray bursts under a new light: the TeV emission from GRB190114C seen by the MAGIC telescopes
DESCRIPTION:Gamma-ray bursts (GRBs) are the most luminous sources of electromagnetic radiation known in the Universe. GRBs had been observed over a broad energy range from the radio band up to GeV gamma rays\, but the TeV gamma-ray band had remained terra incognita for a long time. Thanks to the MAGIC telescopes\, designed to catch the fast glimpses of the GRBs\, the first ever clear detection in this band was achieved for GRB 190114C\, a bright\, long GRB. The TeV emission from GRB190114C belongs to a new energetic component\, providing an energy output comparable at the one at lower energies. We will discuss the details of the observations by MAGIC and the accompanying multi-frequency measurements by more than 20 instruments\, from radio to gamma- rays\, and the inferences on the emission mechanisms. This historical\, highly significant detection has followed an intriguing hint of TeV emission from GRB 160821B\, a short GRB with an associated kilonova. This hint\, if real\, has potential multi-messenger implications on the detectability of gravitational wave alerts in high-energy gamma-rays. \n 
URL:https://www.oa-roma.inaf.it/event/colloquium-antonio-stamerra-3/
LOCATION:Aula Gratton
CATEGORIES:Seminari
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