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TZID:Europe/Paris
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UID:41@osups.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20251201T110000
DTEND;TZID=Europe/Paris:20251201T120000
DTSTAMP:20251116T114228Z
URL:https://osups.universite-paris-saclay.fr/calendrier/the-black-hole-and
 -its-flaring-activity-at-the-center-of-the-galaxy/
SUMMARY:The Black Hole and its Flaring Activity at the Center of the Galaxy
DESCRIPTION:par  Farhad Yusef-Zadeh  (Northwestern University)\n\nAbstract 
 : \n\nPrecise measurements taken at radio and infrared wavelengths over t
 he last two decades have led to the conclusion that a 4.2 million solar ma
 ss black hole lies at the center of the Galaxy. These measurements are con
 sistent with the predictions of the Einstein's general theory of relativit
 y. I will present highlights of recent James Web Space telescope observati
 ons to study the flaring activity of the black hole. The variability of th
 e black hole probes the process of the accretion flow at a distance of few
  Schwarzschild radius. These observations indicate that the flux of Sgr A*
  is fluctuating constantly with multiple synchrotron flares per day. I wil
 l argue that two distinct populations of particles produce bright and fain
 t synchrotron variable emission. As for the origin of the infrared flares\
 , a number of recent simulations suggest that flares are ejected plasmoids
  from the accretion disk due to reconnection of the magnetic field lines. 
 Time permitting\, I will also discuss the origin of X-ray flares from Sgr 
 A*.\n\nLieu : Bât. 200/0-Auditorium - Auditorium P. Lehmann (IJCLab)
CATEGORIES:Séminaires
LOCATION:IJCLab\, Bât 200\, 15 Rue Georges Clemenceau\, Orsay\, 91400 \, E
 ssonne\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Bât 200\, 15 Rue Georges C
 lemenceau\, Orsay\, 91400 \, Essonne\, France;X-APPLE-RADIUS=100;X-TITLE=I
 JCLab:geo:0,0
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DTSTART:20251026T020000
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