Quasi Stellar Radio source
|Automatic translation||Updated June 01, 2013|
Quasars (Quasi-Stellar Radio Sources) are the cores of galaxies in the process of weakening or expansion that are at very large distances, billions of light years. Quasars are the brightest objects in the known Universe but only appear as strange stars low. The images of these areas of low brightness seen by the telescope CFHT (Canada-France-Hawaii Telescope) show, when subtracting the signal corresponding to the quasar, a resulting image that looks like an elliptical galaxy. Quasars can be observed in the spectrum of electromagnetic radio waves, infrared, the visible light, ultraviolet, X-rays and gamma rays. Quasars radiate strongly and have a brightness seemed to come from hundreds of galaxies, but a quasar is about a million times smaller than ordinary galaxy. Due to the power of their influence, and their frequent changes, a time we thought that quasars were relatively low and close rather than distant and powerful objects. The emission of quasars is strongly shifted towards the red, i.e. they move at very high speed of the Milky Way, according to the law of Hubble. Like radio galaxies, some quasars are surrounded by lobes with strong radio emissions.
Most of the radio emission of quasars appears to come from a core of some brilliant light years in diameter at most. The radio galaxies and quasars can be detected at great distance because they are radio sources of extreme power. These radio signals from distant sources are slow to reach the Earth, which is why radio astronomers can see the universe as it appears there are more than 10 billion years back in time to the origins of the Universe. They hope to see this famous moment of the first explosion, the Big Bang.
Image: A quasar is a source of energy the most powerful of the universe, a huge cauldron of incandescent gas, which generates more light than 1 000 galaxies. It is a super massive black hole, a colossal scale as dense a billion suns, seeking a permanent full of stars, 1000 bodies like the Sun per year.
100 000 quasars in the universe
The nearest quasars are now known to be super massive black holes at the centers of galaxies. Unfortunately, the huge luminosity of quasars allows us to observe at very large distances, it makes the study of their host galaxy difficult.
The nearest is at ≈ 780 million light years away and the farthest to ≈ 13 billion al, to the edge of the observable universe. A quasar is a source of energy the most powerful of the universe, a huge cauldron of incandescent gas, which generates more light than 1 000 galaxies. So this is a super massive black hole, a colossal scale as dense a billion suns, seeking a permanent full of stars, 1000 bodies like the Sun per year.
Image: The quasar 3C 273, in the constellation Virgo, is the brightest ever observed.
What does a quasar?
What is happening near the center of this cluster of galaxies, on the image to the cons?
Image: The observation of the universe is sometimes misleading because a happy chance, we can see many strange and imaginary galaxies, such as colored jewels on the image below against.