Searching for a Black Hole:
They emit NO light, so we can’t see a Black Hole directly.
We seek a Stellar Black Hole in a binary system consisting of a visible Giant star and an
invisible and an invisible companion. (=BH Candidate).
We seek a Giant Star that “wobbles” in its orbit.
The Companion causing the “wobble” must be invisible.
The invisible Companion must have a mass >~3M o.
The system must be emitting x-rays (from a surrounding Accretion Disk).
Cygnus X I:
Best Stellar Black Hole Candidate.
We can see a visible supergiant star of ~30M o.
The Supergiant Star is “wobbling” under the influence of an invisible Companion.
The System is emitting x-rays.
Mass of the invisible companion is ~9.5M o.
Recall that a Black Hole singula