Astronomers are closely monitoring two extraordinary black holes, each exhibiting phenomena that challenge existing theories about these enigmatic cosmic entities. One of these is a “serial killer” black hole poised to consume its second star in just five years, while the other, part of a newly discovered triple system called V404 Cygni, is shaking up long-held beliefs about black hole formation.
The Black Hole “Serial Killer” Targets Another Star
Located 215 million light-years from Earth, a supermassive black hole has captured the attention of scientists ever since it caused a bright flare five years ago. This flare resulted from a star drifting too close, initiating what astronomers call a tidal disruption event (AT1910qix). The gravitational forces from the black hole tore the star apart, scattering part of it around the black hole and sending the rest into space.
A team of astronomers led by Dr. Matt Nicholl of Queen’s University Belfast has tracked the remnants of this event using powerful telescopes like the Hubble Space Telescope and the Chandra X-ray Observatory. Recently, a second star has begun passing through this debris every 48 hours, causing bright X-ray bursts with each collision. Dr. Nicholl likens the phenomenon to a diver creating splashes in a pool, with the star as the diver and the disc as the pool.
“What’s uncertain is what will ultimately happen to this star,” Dr. Nicholl said. “It could be pulled into the black hole, or it may eventually disintegrate from these repeated impacts.”
A Rare Triple Black Hole System in Cygnus
In the constellation Cygnus, a rare triple black hole system, known as V404 Cygni, is forcing astronomers to reconsider how black holes form. This system contains a nine-solar-mass black hole and two orbiting stars, one of which is much farther from the black hole than previously thought possible. Typically, a supernova explosion pushes any distant companions too far to remain bound gravitationally, but in this case, a star orbits at a staggering 300 billion miles.
Dr. Kevin Burdge, an MIT research fellow, and his team propose that this black hole may have formed without the usual supernova explosion. Instead, it might have “quietly” collapsed, without ejecting its nearby companions. This groundbreaking hypothesis is generating significant interest among scientists, suggesting that there are still much to learn about how black holes are born.
Astrophysicist Dr. Daniel Holz of the University of Chicago commented on the surprising nature of this discovery, saying, “While unlikely, nature often defies assumptions. This discovery could open a new chapter in black hole research.”
Both of these findings are redefining our understanding of black holes and could lead to significant advances in the field of astrophysics.
