Search Publications

Fifty Years After the Discovery of the First Stellar-Mass Black Hole: A Review of Cyg X-1

Jiang, Jiachen

Around 50 years ago, the famous bet between Stephen Hawking and Kip Thorne on whether Cyg X-1 hosts a stellar-mass black hole became a well-known story in the history of black hole science. Today, Cyg X-1 is widely recognised as hosting a stellar-mass black hole with a mass of approximately 20 solar masses. With the advancement of X-ray telescopes…

Astro-COLIBRI 2—An Advanced Platform for Real-Time Multi-Messenger Discoveries

Reichherzer, Patrick; Schüssler, Fabian; Lefranc, Valentin +3 more

The study of flaring astrophysical events in the multi-messenger approach requires instantaneous follow-up observations to better understand the nature of these events through complementary observational data. We present Astro-COLIBRI as a platform that integrates specific tools in the real-time multi-messenger ecosystem. The Astro-COLIBRI platfor…

Gamma-ray and Neutrino Signals from Accretion Disk Coronae of Active Galactic Nuclei

Inoue, Yoshiyuki; Doi, Akihiro; Khangulyan, Dmitry

To explain the X-ray spectra of active galactic nuclei (AGN), non-thermal activity in AGN coronae such as pair cascade models has been extensively discussed in the past literature. Although X-ray and gamma-ray observations in the 1990s disfavored such pair cascade models, recent millimeter-wave observations of nearby Seyferts have established the …