NASA / ESA’s Hubble Space Telescope observed a rare double quasar, both swirling away inside two merging galaxies, that existed when the universe was just 3-billion-years-old. Quasars are essentially bright celestial objects powered by supermassive black holes spewing massive fountains of energy as they engorge themselves on gas, dust, and anything else within their gravitational grasp.
Hubble’s cameras weren’t quart sharp enough alone to capture these dual light beacons, so Gaia was also used to pinpoint potential double-quasar candidates. This Global Astrometric Interferometer (Gaia) measures the positions, distances, and motions of nearby celestial objects very precisely. Its large database can be used to search for quasars that mimic the apparent motion of nearby stars.
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We’re starting to unveil this tip of the iceberg of the early binary quasar population. This is the uniqueness of this study. It is actually telling us that this population exists, and now we have a method to identify double quasars that are separated by less than the size of a single galaxy,” said Xin Liu of the University of Illinois at Urbana-Champaign.
