Synthetic gravitational lens image of the Sagittarius A* black hole with a thin disc model

Author:

Boero Ezequiel F1ORCID,Moreschi Osvaldo M23ORCID

Affiliation:

1. Instituto de Astronomía Teórica y Experimental (IATE), CONICET, Observatorio Astronómico de Córdoba , Laprida 854, X5000BGR Córdoba , Argentina

2. Facultad de Matemática, Astronomía, Física y Computación (FaMAF), Universidad Nacional de Córdoba , Medina Allende S/N, X5000HUA Córdoba , Argentina

3. Instituto de Física Enrique Gaviola, IFEG, CONICET, Ciudad Universitaria , 5000 Córdoba , Argentina

Abstract

ABSTRACT The images of Sagittarius A* published by the Event Horizon Telescope (ETH) Collaboration in 2022 present features that were associated with an emission ring consistent with what is expected from an accretion disc surrounding the supermassive black hole at the centre of our Galaxy. Here, we generate images of Sgr A* across different configurations of a simple accretion disc model that became successful, in our previous work, in reproducing the main features observed in M87*. Their best image, here reproduced in Fig. 1, suggests a geometric configuration of an inclined disc with three bright regions; which we have considered as our first configuration. Since we were not convinced with the results of this first configuration, we also explore in detail the case of nearly edge-on orientations which are a priori the expected geometry for a relaxed disc, as seen from the plane of the Galaxy. We have produced simulated images using an efficient ray tracing and geodesic deviation methodology that allows to account for deformation, relativistic, and magnification effects. We compare our synthetic images with the EHT images reconstructed with data from April 6 and 7 of 2017. We found that, although the EHT Collaboration seems to discard the image from April 6, our best suggested image resembles the output from the themis pipeline for April 6; which for us gives support for the edge-on configuration.

Funder

CONICET

UNC

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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