Verification of Radiative Transfer Schemes for the EHT
Artikel i vetenskaplig tidskrift, 2020
The Event Horizon Telescope (EHT) Collaboration has recently produced the first resolved images of the central supermassive black hole in the giant elliptical galaxy M87. Here we report on tests of the consistency and accuracy of the general relativistic radiative transfer codes used within the collaboration to model M87∗ and Sgr A∗. We compare and evaluate (1) deflection angles for equatorial null geodesics in a Kerr spacetime; (2) images calculated from a series of simple, parameterized matter distributions in the Kerr metric using simplified emissivities and absorptivities; (3) for a subset of codes, images calculated from general relativistic magnetohydrodynamics simulations using different realistic synchrotron emissivities and absorptivities; (4) observables for the 2017 configuration of EHT, including visibility amplitudes and closure phases. The error in total flux is of order 1% when the codes are run with production numerical parameters. The dominant source of discrepancies for small camera distances is the location and detailed setup of the software "camera"that each code uses to produce synthetic images. We find that when numerical parameters are suitably chosen and the camera is sufficiently far away the images converge and that for given transfer coefficients, numerical uncertainties are unlikely to limit parameter estimation for the current generation of EHT observations. The purpose of this paper is to describe a verification and comparison of EHT radiative transfer codes. It is not to verify EHT models more generally.
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[Person 985e983c-be7c-434c-87dd-b402f3827556 not found]
Max-Planck-Gesellschaft
[Person 84c13f7f-01f4-47d6-bcaf-2cada5fc31d7 not found]
Harvard University
[Person 494ea85a-430d-4f40-ad0d-6813c898601e not found]
University of Illinois
[Person a5b7c42d-6d09-4573-a389-bee99d4d40bc not found]
Huazhong University of Science and Technology
[Person d35d7f51-77ed-4453-ac3e-a1832c088797 not found]
Universiteit Van Amsterdam
[Person dbfe1dd1-d228-44ee-86c7-8f3460c2d1d9 not found]
Harvard-Smithsonian Center for Astrophysics
[Person b84ca50a-6ba1-4159-9797-1296ec22fe5f not found]
Radboud Universiteit
[Person d90ac59a-ac1c-4ae4-a992-1e457630a50a not found]
Chinese Academy of Sciences
[Person 15c155d1-385f-48ea-8958-4b84e19b69ca not found]
University of Science and Technology of China
[Person 4aa551a8-e603-41ee-af0d-dc76dad7f3a6 not found]
Max-Planck-Gesellschaft
[Person 05c2ecd6-3d29-4983-bbb8-556e189c4910 not found]
Korea Astronomy and Space Science Institute
[Person 1be56260-4294-4b52-b341-9af0aa7460b3 not found]
Chinese Academy of Sciences
[Person d3511653-1c14-40e7-b1cf-b295b8c81325 not found]
Harvard University
Astrophysical Journal
0004-637X (ISSN) 1538-4357 (eISSN)
Vol. 897 2 148Ämneskategorier (SSIF 2011)
Astronomi, astrofysik och kosmologi
Datorseende och robotik (autonoma system)
Medicinsk bildbehandling
DOI
10.3847/1538-4357/ab96c6