Hi Jim, thanks a lot! :D
In terms of black hole winds, its hard to say what precisely it would be without finding more particular information on its mechanics. I would say that it could definitely be the "radiation" of "black holes", seen as "hot gas winds" due to its detectable mass, but whether it is would depend on how consistent and uniform it is. If it basically is emitted from the entire body and relatively consistently, then it would likely be its "radiation". Or, if it is more sporadic, random and directional, it could be more like a black hole's "solar flare" equivalent, which most certainly would also occur and be something to consider in all black hole emission observations.
If it is part of the electromagnetic field would depend on if there is a Figure-8 orbit formed or if the particles were able to travel indefinitely away like light from a star. My guess is black holes at the center of galaxies still are relatively low in mass and their electromagnetic field is formed of particles that we still label as "light" (like the Fermi X-ray bubbles you mentioned before, and the microwave haze), but that is a complete guess; maybe "atoms" are components of electromagnetic fields of larger mass bodies that "soon", it's definitely possible. On a large enough scale, any system will be part of a larger system's electromagnetic field. The particulars of which bodies use which particles are a bit harder to say without more observational consideration, on observations that may or may not already have been made.
Even entire galaxies--all the galaxies that we see--are all part of one object's electromagnetic field. This concept I find particularly interesting, as everything that we see in the observable universe would be the smallest fraction of one loop of its electromagnetic field moving together. It appears we are observationally aware of this flow in what is known as "dark flow". Perhaps our Milky Way galaxy is one particle in the electromagnetic field of the Great Attractor, which would give credence to the concept that galactic center black holes are large enough to use atoms as part of their electromagnetic field rather than to emit them as radiation that escapes their gravity.
RE: Cosmic Rays and Infinity