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domingo, 7 de febrero de 2016

NASA : Hubble Views Merging Galaxies in Eridanus .- Telescopio Espacila Hubble observa la fusión de galaxias en Eridanus

Hola amigos: A VUELO DE UN QUINDE EL BLOG., Esta imagen, tomada por el telescopio espacial Hubble de la NASA / ESA, muestra una galaxia peculiar conocida como NGC 1487, situada a unos 30 millones de años luz de distancia en la constelación austral de Eridanus. En lugar de verla como un objeto celeste, en realidad es mejor pensar en esto como un evento. En este caso, estamos en presencia de dos o más galaxias en el acto de la fusión entre sí para formar una sola nueva galaxia. Cada galaxia ha perdido casi todos los rastros de su aspecto original, como estrellas y el gas han sido arrojados por la gravedad en un remolino cósmico elaborado.
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Two or more galaxies in the act of merging together
This image, taken by the NASA/ESA Hubble Space Telescope, shows a peculiar galaxy known as NGC 1487, lying about 30 million light-years away in the southern constellation of Eridanus.

Rather than viewing it as a celestial object, it is actually better to think of this as an event. Here, we are witnessing two or more galaxies in the act of merging together to form a single new galaxy. Each galaxy has lost almost all traces of its original appearance, as stars and gas have been thrown by gravity in an elaborate cosmic whirl.

Unless one is very much bigger than the other, galaxies are always disrupted by the violence of the merging process. As a result, it is very difficult to determine precisely what the original galaxies looked like and, indeed, how many of them there were. In this case, it is possible that we are seeing the merger of several dwarf galaxies that were previously clumped together in a small group.

Although older yellow and red stars can be seen in the outer regions of the new galaxy, its appearance is dominated by large areas of bright blue stars, illuminating the patches of gas that gave them life. This burst of star formation may well have been triggered by the merger.
Image credit: ESA/Hubble & NASA, Acknowledgement: Judy Schmidt
Text credit: European Space Agency
Last Updated: Feb. 5, 2016
Editor: Ashley Morrow
 
NASA
Guillermo Gonzalo Sánchez Achutegui
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