The two black holes lie just 1,560 and 3,800 light-years from our planet, respectively.
that makes them extraordinary, however. They are orbited by stars at much greater distances than has previously been observed in other black hole-companion star pairings.
"What sets this new group of black holes apart from the ones we already knew about is their wide separation from their companion stars," discovery team leader Kareem El-Badry, of the Harvard-Smithsonian Center for Astrophysics in Massachusetts and the Max-Planck Institute for Astronomy in Germany,"Normal" black hole-companion star systems are called X-ray binaries and are usually bright in high-energy X-ray and radio emissions.
"The accuracy of Gaia's data was essential for this discovery," said ESA Gaia project scientist Timo Prusti."The black holes were found by spotting the tiny wobble of its companion star while orbiting around it. No other instrument is capable of such measurements." The Gaia observations were backed up by measurements of each companion star's motion made by other observatories. For example, follow-up investigations of Gaia BH2 with NASA'sand the South African MeerKAT radio telescope on the ground revealed no detectable light coming from this black hole.
"Even though we detected nothing, this information is incredibly valuable because it tells us a lot about the environment around a black hole," said discovery team member Yvette Cendes, of the Harvard-Smithsonian Center for Astrophysics.
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