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Gravitational Lensing in the Schwarzschild Spacetime: Photon Rings in Vacuum and in the Presence of a Plasma
Torben C. Frost
https://arxiv.org/abs/2508.00624 https://

Gravitational Lensing in the Schwarzschild Spacetime: Photon Rings in Vacuum and in the Presence of a Plasma
Astrophysical black holes are usually surrounded by an accretion disk. At least parts of these accretion disks consist of a plasma in which light rays with different energies are dispersed. However, we usually do not know the exact configurations of these plasmas. In this paper we will now use the example of a Schwarzschild black hole embedded in an inhomogeneous pressureless and nonmagnetised plasma to investigate how the structural changes of the photon rings can help us to determine the prop…

Investigating the Bulge Morphology of Dual AGN Host Galaxies from the GOTHIC survey
C. P. Nehal (Department of Physics, Indian Institute of Science Education and Research, Bhopal, India), Mousumi Das (Indian Institute of Astrophysics, Bangalore, India), Sudhanshu Barway (Indian Institute of Astrophysics, Bangalore, India), Francoise Combes (Observatoire de Paris, LERMA, College ` de France, PSL University, Sorbonne University, CNRS, Paris, France), Prerana Biswas (Indian Institute of A…

Investigating the Bulge Morphology of Dual AGN Host Galaxies from the GOTHIC survey
We present a structural analysis of bulges in dual active galactic nuclei (AGN) host galaxies. Dual AGN arise in galaxy mergers where both supermassive black holes (SMBHs) are actively accreting. The AGN are typically embedded in compact bulges, which appear as luminous nuclei in optical images. Galaxy mergers can result in bulge growth, often via star formation. The bulges can be disky (pseudobulges), classical bulges, or belong to elliptical galaxies. Using SDSS DR18 gri images and GALFIT mod…