A supermassive black hole, the largest type of black hole!

A supermassive black hole, the largest type of black hole! - Culture's Ways

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A supermassive black hole (SMBH) is the largest type of black hole, on the order of hundreds of thousands to billions of solar masses (M), and is found in the centre of almost all currently known massive galaxies. In the case of the Milky Way, the SMBH corresponds with the location of Sagittarius A*.

 

What is a supermassive black hole?

Supermassive black holes have properties that distinguish them from lower-mass classifications. First, the average density of a SMBH (defined as the mass of the black hole divided by the volume within its Schwarzschild radius) can be less than the density of water in the case of some SMBHs. This is because the Schwarzschild radius is directly proportional to mass, while density is inversely proportional to the volume. Since the volume of a spherical object (such as the event horizon of a non-rotating black hole) is directly proportional to the cube of the radius, the minimum density of a black hole is inversely proportional to the square of the mass, and thus higher mass black holes have lower average density.

In addition, the tidal forces in the vicinity of the event horizon are significantly weaker for massive black holes. As with density, the tidal force on a body at the event horizon is inversely proportional to the square of the mass: a person on the surface of the Earth and one at the event horizon of a 10 million M black hole experience about the same tidal force between their head and feet. Unlike with stellar mass black holes, one would not experience significant tidal force until very deep into the black hole.

History of research

Donald Lynden-Bell and Martin Rees hypothesized in 1971 that the center of the Milky Way galaxy would contain a supermassive black hole. Sagittarius A* was discovered and named on February 13 and 15, 1974, by astronomers Bruce Balick and Robert Brown using the baseline interferometer of the National Radio Astronomy Observatory. They discovered a radio source that emits synchrotron radiation; it was found to be dense and immobile because of its gravitation. This was, therefore, the first indication that a supermassive black hole exists in the center of the Milky Way.

Image: By ESO/M. Kornmesser – CC BY 4.0
Text: Wikipedia contributors. “Supermassive black hole.” Wikipedia, The Free Encyclopedia. Wikipedia, The Free Encyclopedia, 31 Jul. 2017. Web. 10 Aug. 2017.

8 comments
  1. Vidyardhi nanduri

    concepts must develop through Vision index-nature-philosophy-cosmology studies.
    black-hole and super-massive Black-hole mislead spirit of Science
    on sees Energy Flow above and Energy flows down -a central disk afloat.
    gravity and tidal forces have nomeaning- super-imposition of ignorancefrom earth plane.
    Space-time energy concepts have to be evolved to understand creative function of the universe.

  2. Vidyardhi nanduri

    NOTES:Sub: astronomy needs Reference frame index-cosmology vedas
    My research book -2006 covers this image with alternate predicted Projections-plasmas regulated electromagnetic phenomena in magnetic Field environment-see cosmic PREM Universe 1995 as well
    research books avalable at Lulu -15 Books at LULU. http://www.lulu.com/spotlight/jnani108
    COSMOLOGY VEDAS INTERLINKS © Vidyardhi Nanduri
    Info: Understanding Jet Genesis and Collimation https://eventhorizontelescope.org/science
    M87 is a giant elliptical galaxy in the constellation Virgo. Like Sgr A*, M87 harbors a supermassive black hole living at its center. This black hole is one of the most massive known, 6 billion times more massive than our Sun and 1,500 times more massive than Sgr A*. M87 is 50 million light years from Earth— nearby on a cosmic scale but 2,000 times further away than Sgr A*. More massive black holes have larger event horizons, but, due to distance, the apparent size of the black hole in M87 as viewed from Earth is expected to be slightly smaller than that of Sgr A*.
    The most striking feature of M87 is a narrow, one-sided jet emanating from its center and extending for thousands of light years

  3. Vidyardhi nanduri

    NOTES:Sub: astronomy needs Reference frame index-cosmology vedas
    My research book -2006 covers this image with alternate predicted Projections-plasmas regulated electromagnetic phenomena in magnetic Field environment-see cosmic PREM Universe 1995 as well
    research books avalable at Lulu -15 Books at LULU

  4. Thuillet

    Comment différencier un SBMH né juste après le Big-Bang d’un SBMH issu de la fusion de 2 ou plusieurs trous noirs ?

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