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SUMMARY:Frederic Vincent (Paris Meudon Observatory)
DTSTART:20200512T173000Z
DTEND:20200512T183000Z
DTSTAMP:20260423T024750Z
UID:BHIColloq/3
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/BHIColloq/3/
 ">What can we infer from black hole images?</a>\nby Frederic Vincent (Pari
 s Meudon Observatory) as part of BHI Colloquium\n\n\nAbstract\nThe recent 
 Event Horizon Telescope (EHT) millimeter image of the vicinity of the supe
 rmassive compact object M87* at the center of the galaxy M87 is a breakthr
 ough. It is important to investigate what can and what cannot be inferred 
 from such images. In this talk I will discuss a simple geometric model of 
 the region of the accretion flow immediately surrounding M87*. I will use 
 this model to discuss the highly-lensed features of EHT-like images\, ofte
 n loosely referred to as the "photon ring". I will discuss whether such fe
 atures can be used as clean probes of the nature of the underlying spaceti
 me. I will also discuss various EHT-like images of M87*\, assuming this ob
 ject is various kinds of compact alternatives to the standard black hole. 
 This will allow discussing to what extent can EHT-like images help constra
 in the nature of the compact objects at the center of M87 or our Milky Way
 .\n
LOCATION:https://researchseminars.org/talk/BHIColloq/3/
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