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Kristy Pryzmont May 5th 2001 Astronomy HWK 4 ASTR220 1There is evidence that supports the hypothesis that the Milky Way Galaxy has a massive black hole at its core At the center of our very own galaxy is a mysterious source of energy Vast amounts of radiation pour from this compact source which may be a Supermassive Black Hole Astronomers found an intense radio source with strings of other radio sources clustered about it in the direction of the galactic center The intense source was named Sagittarius A because the center of the galaxy lies in the direction of the constellation Sagittarius The position of Sagittarius A as has been observed through radio telescopes around the world seems to be very near the dynamical and gravitational center of the galaxy Based on its high luminosity and radio spectrum Sagittarius A is neither a star nor a pulsar It has a luminosity of 5 stars but is smaller than our solar system Also it cant be a supernova remnant since it is not expanding The strongest evidence that it is a Supermassive Black Hole comes from Doppler shift of ionized gas in its vicinity Their observed speeds as high as 300 kms can be explained as an orbital and spiral motion around the center Therefore a source of gravity is required to hold these high-speed gases in orbit Such a massive object this compact can only be a Supermassive Black Hole 2On the website there is much clear evidence of a black hole in the central region of the Virgo cluster galaxy M 87 The first picture shows a spiral shaped hot gas at the core of our active galaxy The gas is rotating so rapidly that there must be a black hole at the center The region M 87 fits the description of a black hole It weights as much as three billion suns but is concentrated into
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