Here is a bit more information on this awesome discovery:

The discovery, published in the journal Nature, confirms that these sources conceal a compact object pulling in matter at extraordinarily high rates.

When observing the Universe at x-ray wavelengths, the celestial sky is dominated by two types of astronomical objects: supermassive black holes, sitting at the centres of large galaxies and ferociously devouring the material around them, and binary systems, consisting of a stellar remnant – a white dwarf, neutron star or black hole – feeding on gas from a companion star.

What do you think of this spotting?  And in a related question, what portion of dark matter, if at all do you think this contributes to these wild factors?  Feel free to comment with your ideas.  And check back for updates to this story.

thanks to the u of cambridge for the great info