00443nas a2200169   4500000000100000000000100001008004100002260001200043100001900055700001200074700001600086700001700102700002000119245011800139300000800257490000800265       2015                            d  c11/20151 aM. D. Johnson1 aA. Loeb1 aH. Shiokawa1 aA. A. Chael1 aS. S. Doeleman00aMeasuring the Direction and Angular Velocity of a Black Hole Accretion Disk via Lagged Interferometric Covariance  a1320 v813