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Keyword: Sgr A* ×Clear all

2 claims from 1 paper

1. Physics and Astronomy › Astrophysical Phenomena and Observations

   Superradiant evolution of the shadow and photon ring of Sgr A⋆

   Chen, Roy, Vagnozzi and Visinelli · Physical review. D/Physical review. D. · 2022

   The paper studies whether ultralight bosons could make the shadow of Sgr A* change over years, and proposes two observables that the Event Horizon Telescope might use to detect this.

   Unchecked2 claims
   Show 2 claims

   1. UncheckedTwo measures of how a black hole's shadow changes over time are shown to complement each other, depending on the angle from which it is viewed.“The two observables are shown to be highly complementary, depending on the observer's inclination angle.”
   2. UncheckedIf superradiant instability occurs around Sgr A*, its shadow and photon ring could change noticeably within a few years, in reach of the Event Horizon Telescope.“Focusing on the supermassive object Sgr A$^\star$ we show that both observables can vary appreciably over human timescales of a few years in the presence of superradiant instability, leading to signatures which are well within the reach of the Event Horizon Telescope for realistic observation times…”