253 citations · 1.9k across the 62 of their papers we have counts for
4 papers · 1 filter
Hints for an axion-like particle from PKS 1222+216?
Giorgio Galanti, Marco Roncadelli, Fabrizio Tavecchio +1
Flat spectrum radio quasars (FSRQs) are a particular class of blazars rich of optical/ultraviolet photons inside the broad line region (BLR), necessarily implying a huge optical de…
Photon-ALP conversions inside AGN
F. Tavecchio, G. Galanti, M. Roncadelli
An intriguing possibility to partially circumvent extragalactic background light (EBL) absorption in very-high-energy (VHE) observations of blazars is that photons convert into axi…
Constraining the high redshift formation of black hole seeds in nuclear star clusters with gas inflows
Alessandro Lupi, Monica Colpi, Bernadetta Devecchi +2
In this paper we explore a possible route of black hole seed formation that appeal to a model by Davies, Miller & Bellovary who considered the case of the dynamical collapse of a d…
Photons to axion-like particles conversion in Active Galactic Nuclei
Fabrizio Tavecchio, Marco Roncadelli, Giorgio Galanti
The idea that photons can convert into axion-like particles (ALPs) in or around an AGN and reconvert back into photons in the Milky Way magnetic field has been p…