Lepto-hadronic model for the broadband emission of Cygnus X-1

Understand

Cygnus X-1 is a well observed microquasar.

• Broadband observations at all wavelengths have been collected over the years.
• The origin of the MeV tail observed with COMPTEL and INTEGRAL is still under debate and it has mostly been attributed to the corona, although its high degree of polarization suggests it is synchrotron radiation from a jet.
• The origin of the transient emission above $\sim 100$ GeV is also unclear.