We use the exquisite prior constraints on the mass-to-distance ratio for Sgr A* to show that the observed image size is within similar to 10% of the Kerr predictions. We calibrate the relationship between the geometrically defined black hole shadow and the observed size of the ring-like images using a library that includes both Kerr and non-Kerr simulations. We present new constraints on potential deviations from the Kerr prediction based on 2017 EHT observations of Sagittarius A* (Sgr A*).
This is the only stationary, vacuum, axisymmetric metric, without electromagnetic charge, that satisfies Einstein's equations and does not have pathologies outside of the event horizon. Testing the Black Hole Metric Sanchez-Arguelles D Chatterjee K Kofuji Y James DJ Kettenis M Impellizzeri CMV Hada K Crew GB Kim JY Alberdi A Gold R Moscibrodzka M Britzen S Musoke G Traianou E Ricarte A Loinard L Zensus JA Alef W Torne P Galison P Mao JR Broderick AE Yamaguchi P Dempsey J Asada K Farah J Li ZY Nakamura M SooHoo J Dexter J Garcia R Matthews LD Rottmann H Wardle J Baubock M Schloerb FP Karami M De Laurentis M Haworth K Nagar NM Lu RS Natarajan I Brissenden R Ramakrishnan V Jannuzi BT Fuentes A Plambeck R Lee D Wagner J Lee SS Georgiev B Zhao GY Marchili N Baczko AK Algaba JC Anantua R Bronzwaer T Kino M Savolainen T Chael A Balokovic M Wondrak MF Marti-Vidal I Sanchez S Conroy NS Ros E Preciado-Lopez JA Neri R Prather B Levis A Parsons H Muller C Jiang W Moriyama K Wong GN Kim DJ Matsushita S Nathanail A Fraga-Encinas R Goddi C Ni CC Souccar K Desvignes G Marscher AP Gentaz O Jorstad S Shen ZQ Chatterjee S Cheng XP Gammie CF Shao LJ Conway JE Jung T Lauer TR Koyama S Weintroub J Sohn BW Bower GC Ikeda S Liu J Ozel F Porth O Honma M Blackburn L Nagai H Lo WP Pu HY Rogers A Tazaki F Huang CWL Brinkerink CD Gomez JL Myserlis I Ceccobello C Rawlings MG Chen YJ La Bella N Fuentes SN Psaltis D Christian P Pesce DW Small D van Langevelde HJ Freeman WT Ruiz I Rezzolla L Ho P Krichbaum TP Ward-Thompson D Potzl FM Wex N Crawford TM Narayanan G Noutsos A Sasada M Ripperda B van Bemmel I Doeleman SS Gurwell M Young K Palumbo DCM Satapathy K Marrone DP Yuan F Lisakov M Oh J Gu MF Mizuno Y Dougal S Wiik K Lindqvist M Titus M Bouman KL Benson BA Hughes DH Leung PK Kim J Younsi Z Ortiz-Leon GN Lindahl G Zhao SS Witzel G Bintley D Pen UL Broguiere D Tiede P Deane R Azulay R Ball D Blundell R Zhang S Ford HA Oyama T Liuzzo E Pietu V Yoon D Emami R Chan CK Kuo CY Bustamante S Mizuno I Carlstrom JE Boyce H Byun DY Chen MT Young A Michalik D Medeiros L PopStefanija A Huang L Trent T Menten KM Ho LC Kocherlakota P Akiyama K Fromm CM Mus A Haggard D Raymond AW Friberg P Yuan YF Davelaar J Cui YZ Markoff S Neilsen J Park J Ruszczyk C Paraschos GF Lico R Karuppusamy R Roshanineshat A Janssen M Tetarenko AJ Cruz-Osorio A Moran JM Narayan R Patel N Olivares H Liu K Okino H Barrett J Roy AL Cordes JM Vos J Hecht MH Trippe S Tilanus RPJ Kawashima T Kramer M Johnson MD Jeter B Schuster KF Inoue M Hesper R Heumann D Wharton R Lobanov AP Rao R Sun H Issaoun S Roelofs F Bach U Lonsdale CJ Nadolski A Cho I Joshi AV Eatough RP Dzib SA Bremer M Schonfeld J Romero-Canizales C Gomez-Ruiz AI Fish VL Koay JY Dhruv V Kramer C Sanchez-Portal M Keating GK Wielgus M Rygl KLJ Nowak MA Falcke H van Rossum DR Fomalont E Koch PM Wu QW Turk M Jimenez-Rosales AĪstrophysical black holes are expected to be described by the Kerr metric. First Sagittarius A* Event Horizon Telescope Results.
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