Caption: Sagittarius A* (Sag A*) and its environment as imaged in the X-ray (and therefore false-color) by Chandra X-ray Observatory (1999--).
Features:
Sag A* is also an X-ray source evidently.
There may be some non-thermal EMR too---but yours truly must look this up.
For stellar-mass black holes, this seems very unlikely. They are all much too far away and too small to resolve.
But may be possible to resolve the supermassive black hole at the Galactic center.
In fact, there is a plan to resolve this supermassive black hole (which can be called the Galactic center black hole and which is located the astronomical radio source Sagittarius A*) by perhaps 2016 (see Wikipedia: Event Horizon Telescope).
See the figure below. The EHT is a project that uses a global array of radio telescope to try to image the neighborhood of the