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jueves, 14 de enero de 2016

NASA : Hubble Sees a Supermassive and Super-hungry Galaxy .- Telescopio Espacial Hubble ve una galaxia Supermassive y Super-hambre

Hola amigos: A VUELO DE UN QUINDE EL BLOG., Esta imagen del telescopio espacial de la NASA / ESA Hubble muestra la galaxia espiral NGC 4845, que se encuentra más de 65 millones de años-luz de distancia en la constelación de Virgo (La Virgen). La orientación de la galaxia revela claramente sorprendente estructura espiral de la galaxia: un disco plano y sin polvo que rodea a una abigarrada bulbo galáctico brillante.
Centro brillante de NGC 4845 alberga una versión gigantesca de un agujero negro, conocido como un agujero negro supermasivo. La presencia de un agujero negro en una galaxia lejana como NGC 4845 se puede deducir de su efecto en las estrellas más internas de la galaxia; estas estrellas experimentan una fuerte atracción gravitatoria del agujero negro y el genio de alrededor del centro de la galaxia mucho más rápido que lo contrario.
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Image of spiral galaxy NGC 4845, a flat and dust-mottled disk surrounding a bright galactic bulge.
This NASA/ESA Hubble Space Telescope image shows the spiral galaxy NGC 4845, located over 65 million light-years away in the constellation of Virgo (The Virgin). The galaxy’s orientation clearly reveals the galaxy’s striking spiral structure: a flat and dust-mottled disk surrounding a bright galactic bulge.

NGC 4845’s glowing center hosts a gigantic version of a black hole, known as a supermassive black hole. The presence of a black hole in a distant galaxy like NGC 4845 can be inferred from its effect on the galaxy’s innermost stars; these stars experience a strong gravitational pull from the black hole and whizz around the galaxy’s center much faster than otherwise.

From investigating the motion of these central stars, astronomers can estimate the mass of the central black hole — for NGC 4845 this is estimated to be hundreds of thousands times heavier than the sun. This same technique was also used to discover the supermassive black hole at the center of our own Milky Way — Sagittarius A* — which hits some four million times the mass of the sun.

The galactic core of NGC 4845 is not just supermassive, but also super-hungry. In 2013 researchers were observing another galaxy when they noticed a violent flare at the center of NGC 4845. The flare came from the central black hole tearing up and feeding off an object many times more massive than Jupiter. A brown dwarf or a large planet simply strayed too close and was devoured by the hungry core of NGC 4845.

Image credit: ESA/Hubble & NASA and S. Smartt (Queen's University Belfast)
Text credit: European Space Agency

Last Updated: Jan. 8, 2016
Editor: Ashley Morrow
NASA
Guillermo Gonzalo Sánchez Achutegui
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