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An "impossibly large" black hole 12 billion times the mass of the Sun and that powered one of the brightest objects in the early universe has been discovered. An international team of astronomers spotted the giant black hole at the centre of a quasar that pumps out a million billion times the energy of our Sun.
originally posted by: DeadSeraph
a reply to: purplemer
This is cool, but I remember reading a post not too long ago about how the universe was eternal, and black holes didn't exist. So which is it?
I cant really get my head around the size of this thing
More than 200,000 quasars are known, most from the Sloan Digital Sky Survey. All observed quasar spectra have redshifts between 0.056 and 7.085. Applying Hubble's law to these redshifts, it can be shown that they are between 600 million[12] and 28.85 billion light-years away (in terms of comoving distance). Because of the great distances to the farthest quasars and the finite velocity of light, we see them and their surrounding space as they existed in the very early universe.
Since quasars exhibit properties common to all active galaxies, the emission from quasars can be readily compared to those of smaller active galaxies powered by smaller supermassive black holes. To create a luminosity of 1040 watts (the typical brightness of a quasar), a super-massive black hole would have to consume the material equivalent of 10 stars per year. The brightest known quasars devour 1000 solar masses of material every year. The largest known is estimated to consume matter equivalent to 600 Earths per minute. Quasar luminosities can vary considerably over time, depending on their surroundings. Since it is difficult to fuel quasars for many billions of years, after a quasar finishes accreting the surrounding gas and dust, it becomes an ordinary galaxy.
Quasars also provide some clues as to the end of the Big Bang's reionization. The oldest known quasars (redshift ≥ 6) display a Gunn-Peterson trough and have absorption regions in front of them indicating that the intergalactic medium at that time was neutral gas. More recent quasars show no absorption region but rather their spectra contain a spiky area known as the Lyman-alpha forest; this indicates that the intergalactic medium has undergone reionization into plasma, and that neutral gas exists only in small clouds.
originally posted by: intergalactic fire
a reply to: purplemer
black holes are just a fantasy, a dream in the mind(math) of relativity theorists.
How did they spotted it? did they saw it or is it just an assumption there has to be a giant black hole according to their theories?
Scientists can't directly observe black holes with telescopes that detect x-rays, light, or other forms of electromagnetic radiation. We can, however, infer the presence of black holes and study them by detecting their effect on other matter nearby. If a black hole passes through a cloud of interstellar matter, for example, it will draw matter inward in a process known as accretion. A similar process can occur if a normal star passes close to a black hole. In this case, the black hole can tear the star apart as it pulls it toward itself. As the attracted matter accelerates and heats up, it emits x-rays that radiate into space. Recent discoveries offer some tantalizing evidence that black holes have a dramatic influence on the neighborhoods around them - emitting powerful gamma ray bursts, devouring nearby stars, and spurring the growth of new stars in some areas while stalling it in others.
Even then, it's ridiculous to assume this when they don't even know what a quasar really is and their interpretation of the red shift is wrong or incomplete.
originally posted by: DeadSeraph
a reply to: purplemer
This is cool, but I remember reading a post not too long ago about how the universe was eternal, and black holes didn't exist. So which is it?
originally posted by: purplemer
originally posted by: DeadSeraph
a reply to: purplemer
This is cool, but I remember reading a post not too long ago about how the universe was eternal, and black holes didn't exist. So which is it?
I wonder if black holes exist. Adleast with our present understanding anyways. They are detected by their ability to give out large amounts of energy. Not really what I would expect a black hole to do.
There is something there but what they really are is not in my opinion understood as such...
purp..
Contrary to popular belief, black holes do give out radiation. The bigger the hole the "brighter" it is. Look it up. Stephen hawking discovered the phonemen as i recall.