Long term variability of Cygnus X-1. VIII. A spectral-timing look at low energies with NICER

Ole König, Guglielmo Mastroserio, Thomas Dauser +19

The Neutron Star Interior Composition Explorer (NICER) monitoring campaign of Cyg X-1 allows us to study its spectral-timing behavior at energies $<1$ keV across all states. The…