The jets emitted by black holes are easier to
study than the black holes themselves because the jets are so large.
Not exact matches
Both groups of astronomers
studied a particular quasar called APM 08279 +5255, which harbors a
black hole 20 billion times more massive
than the sun and produces as much energy as a thousand trillion suns.
In some of the best -
studied events, this emission seems to be located much farther
than where the
black hole's tides could shatter the star.
In a
study published in Solar and Stellar Astrophysics, the researchers say they saw the red supergiant star N6946 - BH1 flare a million times brighter
than our sun for several months in 2009 before fading out of visible wavelengths, a likely sign of a brand - new
black hole.
In a new
study in the journal Nature Astronomy, a team of researchers from Dublin City University, Columbia University, Georgia Tech, and the University of Helsinki, add evidence to one theory of how these ancient
black holes, about a billion times heavier
than our sun, may have formed and quickly put on weight.
In a 2008
study, Haiman and his colleagues hypothesized that radiation from a massive neighboring galaxy could split molecular hydrogen into atomic hydrogen and cause the nascent
black hole and its host galaxy to collapse rather
than spawn new clusters of stars.
Most of the
black holes in LIGO's mergers have been middleweights, being heavier
than that 20 — solar mass limit but much lighter
than the supermassive variety, raising questions about their origins and relationship to the two well -
studied populations of
black holes.
«When we analyzed the Keck data, we found the emitting region of SDSS1133 is less
than 40 light - years across, and that the center of Markarian 177 shows evidence of intense star formation and other features indicating a recent disturbance that matched what we expected for a recoiling
black hole,» said Chao - Ling Hung, a UH Manoa graduate student performing the analysis of the Keck Observatory imaging in the
study.
Further
studies showed that this object, called B3 1715 +425, is a supermassive
black hole surrounded by a galaxy much smaller and fainter
than would be expected.
«Another way for a
black hole to grow this big is for it to have gone on a sustained binge, consuming food faster
than typically thought possible,» said
study lead author Chao - Wei Tsai, also of JPL.
«Our calculations show that the supermassive
black holes are 40 percent heavier
than previously thought,»
study co-author Darach Watson, of the University of Copenhagen's Niels Bohr Institute (NBI), said in a statement.
The enormous
black holes that lurk at the hearts of all galaxies are significantly bigger
than astronomers had imagined, a new
study suggests.
«We believe we have observed two supermassive
black holes in closer proximity
than ever before,» Suvi Gezari, assistant professor of astronomy at the university and a co-author of a new
study, published last week in the Astrophysical Journal Letters, said, in a statement released Monday.
The supermassive
black holes that lie in the center of most galaxies may have far more voracious appetites
than experts previously believed, according to a new
study that has uncovered evidence that these behemoths shred stars 100 times more often
than earlier research had suggested.
But, in the early universe, their
study shows that the 3C 298 galaxy is 100 times less massive
than it should be given its behemoth supermassive
black hole mass.
Supermassive
black holes lurking in the hearts of countless galaxies are growing faster
than astronomers suspected based on earlier
studies.
Later
studies by Caltech and the LIGO Scientific Collaboration (LSC), a group of more
than 1,200 scientists worldwide, found some evidence that the material in each of the stars might have been torn apart by the gravity of its companion in a way that
black holes could not.
Confirming previous Chandra results, this
study finds the fraction of galaxies found to be hosting supermassive
black holes is much higher
than found with optical searches.