Modelling the shadow of Sgr A* through an eclipsing black hole

2025/02/22 by Milton Jair Santibañez-Armenta, Gustavo Magallanes-Guijón, Sergio Mendoza +2 · 3 voices
Engineering · Physics and Astronomy · #Astrophysical Phenomena and Observations #Mechanics and Biomechanics Studies #astro-ph.HE #gr-qc

paper · pdf · doi:10.1093/mnrasl/slaf033

openalex publication_date 2025/03/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/29

Abstract

ABSTRACT The Event Horizon Telescope (EHT) observations of Sgr A* resolved the shadow image and emission ring-like structure, which is associated to the photon ring of the supermassive black hole, at the Galactic Centre, revealing a diameter of 51.8~μ as. The ring-like structure is consistent with that of a Kerr black hole. However, the source of the high bright regions in the image and the time variability remain an open question. Besides the plasma properties and emission models, the space-time geometry also holds an important role. We present an image depicting the bright hotspots consistent with Sgr A* observations at a wavelength λ = 1.3 \rm mm. The image is the result of an eclipsing Schwarzschild black hole situated along the line of sight between the Galactic Centre and Earth. The separation from both, primary (Sgr A*) and secondary (eclipsing) black holes is 10 233 AU. The central supermassive black hole located at the centre of the Galaxy has an observational mass of 4.14× 10⁶ \rm M_\odot and the secondary eclipsing black hole has an inferred mass of 1035 \rm M_\odot .

Citations

• First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way

Discussions

• #arXiv Modeling the shadow of Sgr A* through an eclipsing black hole https://arxiv.org/abs/2502.16058 The separation from both, primary (Sgr A*) and secondary (eclipsing) black holes is 10233 AU. The [bsky, 10 points, 2 comments]
• #arXiv Modeling the shadow of Sgr A* through an eclipsing black hole https://arxiv.org/abs/2502.16058 The separation from both, primary (Sgr A*) and secondary (eclipsing) black holes is 10233 AU. The [bsky, 0 points, 0 comments]
• # arXiv Modeling the shadow of Sgr A* through an eclipsing black hole https:// arxiv.org/abs/2502.16058 The separation from both, primary (Sgr A*) and secondary (eclipsing) black holes is 10233 AU. Th [mastodon, 0 points, 0 comments]

Related

• First Sagittarius A* Event Horizon Telescope Results. III. Imaging of the Galactic Center Supermassive Black Hole
• First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way
• Reconstruction of Static Black Hole Images Using Simple Geometric Forms
• Observing a Black Hole Event Horizon: (Sub)Millimeter VLBI of Sgr A*
• Observational Constrains on the Sgr A^* Black Hole Immersed in a Dark Matter Halo: Shadow and S2 Star Orbit