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…
astro-ph.CO2025
Modelling Gaia photometry signals of dark halos
George Pappas, Ippocratis D. Saltas, Laurent Eyer
We use the framework of microlensing to show that observations of binary systems, such as those made by {\it Gaia}, combined with follow-up weak lensing measurements, can provide a…