3 papers
gr-qc2025
SMBH shadows: gravity fingerprints revealed by spectral line background radiation
Konstantinos Kostaros, Padelis Papadopoulos, Wing-Fai Thi +1
SMBHs at the centers of galaxies, illuminated by their accretion disks, can reveal valuable information on BH spacetimes via their shadows, which can be used for strong-gravity tes…
gr-qc2025
An Einstein ring fingerprint around SMBHs illuminated by BLR spectral lines
Konstantinos Kostaros, George Pappas, Padelis Papadopoulos +1
The continuum emission from the hot and ionized inner regions of a supermassive black hole (SMBH) accretion disk that is strongly lensed by the light-ring (i.e., the unstable photo…
gr-qc2024
Fractal signatures of non-Kerr spacetimes in the shadow of light-ring bifurcations
Konstantinos Kostaros, Padelis Papadopoulos, George Pappas
Light-ring bifurcations that can occur for prolate non-Kerr compact objects can leave an indelible signature on SMBH shadows as a fractal sequence of eyebrow-like formations. These…