3 papers
astro-ph.HE2026
Broadband multiwavelength properties of the archetypal blazar 3C 279 during the 2017 Event Horizon Telescope campaign
G. Principe, J. C. Algaba, E. Aviano +529
The archetypal blazar 3C 279 hosts a prominent relativistic jet and exhibits strong broadband variability across the electromagnetic spectrum. In April 2017, the Event Horizon Tele…
astro-ph.HE2025
Lensing of hot spots in Kerr spacetime: An empirical relation for black hole spin estimation
A. I. Yfantis, D. C. M. Palumbo, M. MoÅcibrodzka
Sagittarius A* (Sgr A*) exhibits frequent flaring activity across the electromagnetic spectrum, often associated with a localized region of strong emission, known as a hot spot. We…
astro-ph.HE2024
Hot-spots around Sagittarius A*: Joint fits to astrometry and polarimetry
A. I. Yfantis, M. Wielgus, M. A. MoÅcibrodzka
Observations of Sagittarius A* (Sgr A*) in near-infrared (NIR) show irregular flaring activity. Flares coincide with astrometric rotation of brightness centroid and with looping pa…