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Black Holes

Discussion in 'Science & Technology' started by Drone, Sep 24, 2011.

  1. Drone

    Drone

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    Rare Triple Supermassive Black Hole System

    Einstein’s General Relativity predicts that merging black holes are sources of gravitational waves. Astronomers have managed to spot three black holes packed about as tightly together as they could be before spiraling into each other and merging.

    Galaxy SDSS J150243.09+1111557.3 contains a triple system with a very compact double supermassive black hole J1502S (E&W) and J1502P.

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  2. D007

    D007

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  3. Drone

    Drone

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    Astronomers have uncovered rhythmic pulsations from a rare type of black hole 12 million ly away by sifting through archival data from NASA's Rossi X-ray Timing Explorer satellite. The signals have helped astronomers identify an unusual midsize black hole called M82 X-1. By going over past RXTE observations, the astronomers found specific changes in brightness that helped them determine M82 X-1 measures around 400 solar masses.
     
  4. Drone

    Drone

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    The relatively nearby dwarf galaxy M60-UCD1 may house a supermassive black hole at its heart equal in mass to ~ 21 million suns.



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    It lies ~ 54 million ly away from Earth and orbits M60, one of the largest galaxies near the Milky Way, at a distance of only ~ 22000 ly from the larger galaxy's center, closer than the sun is to the center of the Milky Way!

    The scientists calculated the size of the supermassive black hole that may lurk inside M60-UCD1 by analyzing the motions of the stars in that galaxy, which helped the researchers deduce the amount of mass needed to exert the gravitational field seen pulling on those stars. The stars at the center of M60-UCD1 zip at speeds of ~ 370000 km/h, much faster than stars would be expected to move in the absence of such a black hole.

    The supermassive black hole at the core of the Milky Way has a mass of ~ 4 million suns, taking up less than 0.01% of the galaxy's estimated total mass, which is ~ 50 billion suns. In comparison, the supermassive black hole that may lie in the core of M60-UCD1 appears five times larger than the one in the Milky Way, and also seems to make up about 15% of the dwarf galaxy's mass, which is ~ 140 million suns. That's pretty amazing, given that the Milky Way is 500 times larger and more than 1000 times heavier than M60-UCD1.

    The researchers suggest M60-UCD1 was once a very large galaxy, with maybe 10 billion stars, but then it passed very close to the center of an even larger galaxy, M60, and in that process, all the stars and dark matter in the outer part of the galaxy got torn away and became part of M60. That was maybe as much as 10 billion years ago.

    Eventually, M60-UCD1 may merge with the center of M60, which has a monster black hole in it, with 4.5 billion solar masses (>1000 times bigger than the supermassive black hole in our galaxy!). When that happens, the black hole in M60-UCD1 will merge with that monster black hole.

    The astronomers suggest the way stars move in many other ultra-compact dwarf galaxies hints that they may host supermassive black holes, as well. All in all, the scientists suggest that ultra-compact dwarf galaxies could double the number of supermassive black holes known in the nearby regions of the universe. The researchers are participating in ongoing projects that may provide conclusive evidence for supermassive black holes in 4 other ultra-compact dwarfs.

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  5. VulkanBros

    VulkanBros

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    Monster Black Hole Found in Dwarf Galaxy video :
     
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  6. FordGT90Concept

    FordGT90Concept "I go fast!1!11!1!"

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  7. Drone

    Drone

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    Astronomers have discovered a black hole that is consuming gas from a nearby star 10 times faster than previously thought possible. The black hole P13 lies on the outskirts of NGC 7793 ~ 12 million ly from Earth.

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    P13 rotates around a supergiant 'donor' star (20 times heavier than our Sun) in 64 days. Scientists worked out that the black hole must be <15 times the mass of our Sun


    Size don't always matter XD
     

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