A deep stare into the abyss: spectral-timing an entire binary orbit of Cygnus X-1
Abstract
At the end of May 2016, XMM-Newton observed the high mass black hole X-ray binary Cygnus X-1 in the hard state for an entire week, simultaneous with NuSTAR, INTEGRAL, and a suite of radio interferometers. Besides studies of the stellar wind and the X-ray/jet connection, the main goal of this campaign - which we call CHOCBOX, Cyg x-1-1 Hard State Observations of a Complete Binary Orbit in X-rays - was to carry out the most detailed X-ray spectral-timing study of an accreting black hole in the hard state to date, to shed completely new light on the emission geometry of the very innermost regions in this state. In this talk, I will present results from our X-ray spectral-timing work on the CHOCBOX data, including unprecedented sensitivity to the disk reverberation signal from a stellar-mass black hole system. I will discuss the constraints on the disk and coronal geometry imposed by the reverberation signal, as well as the hard continuum lags seen at lower frequencies, which we are now able to model together with the reverberation in a self-consistent physical picture which connects the disk and coronal variability.
- Publication:
-
The X-ray Universe 2017
- Pub Date:
- October 2017
- Bibcode:
- 2017xru..conf..230U