RT Journal Article
SR Electronic
T1 Universal interferometric signatures of a black hole’s photon ring
JF Science Advances
JO Sci Adv
FD American Association for the Advancement of Science
SP eaaz1310
DO 10.1126/sciadv.aaz1310
VO 6
IS 12
A1 Johnson, Michael D.
A1 Lupsasca, Alexandru
A1 Strominger, Andrew
A1 Wong, George N.
A1 Hadar, Shahar
A1 Kapec, Daniel
A1 Narayan, Ramesh
A1 Chael, Andrew
A1 Gammie, Charles F.
A1 Galison, Peter
A1 Palumbo, Daniel C. M.
A1 Doeleman, Sheperd S.
A1 Blackburn, Lindy
A1 Wielgus, Maciek
A1 Pesce, Dominic W.
A1 Farah, Joseph R.
A1 Moran, James M.
YR 2020
UL http://advances.sciencemag.org/content/6/12/eaaz1310.abstract
AB The Event Horizon Telescope image of the supermassive black hole in the galaxy M87 is dominated by a bright, unresolved ring. General relativity predicts that embedded within this image lies a thin “photon ring,” which is composed of an infinite sequence of self-similar subrings that are indexed by the number of photon orbits around the black hole. The subrings approach the edge of the black hole “shadow,” becoming exponentially narrower but weaker with increasing orbit number, with seemingly negligible contributions from high-order subrings. Here, we show that these subrings produce strong and universal signatures on long interferometric baselines. These signatures offer the possibility of precise measurements of black hole mass and spin, as well as tests of general relativity, using only a sparse interferometric array.