Showing posts with label galaxies. Show all posts
Showing posts with label galaxies. Show all posts

Wednesday, April 5, 2017

Radiation from Nearby Galaxies Helped Fuel First Monster Black Holes

Galaxy

Presence of Supermassive Blackholes – Confusion of Astronomers

The presence of supermassive black holes towards the beginning of the creation has given rise to confusion to astronomers from the time of their discovery, more than a decade back. A supermassive black hole is considered to be formed over billions of years, though more than two dozen of these behemoths have been seen within 800 million years of the Big Bang 13.8 billion of years ago.

A team of researchers from Dublin City University, Georgia Tech, Columbia University as well as the University of Helsinki, in their new study in the journal `Nature Astronomy’, showed signs of one concept on how these antique black holes which seemed to be around billion times heavier than the sun could be formed and seemed to put on weight rapidly.

The researchers showed that a black hole could swiftly develop towards the core of its host galaxy if an adjoining galaxy and seemed to emit sufficient radiation to switch off its capability to form stars. Hence restricted, the host galaxy is inclined to cultivate till it ultimately collapses, forming a black hole which feeds on the left over gas, and later, dust, dying stars, and perhaps other black holes, that become great colossal.
  

Collapse of Galaxy/Formation of a Million-solar-mass BlackHole


According to co-author, Zoltan Haiman, an astronomy professor at Columbia University commented that the collapse of the galaxy and the formation of a million-solar-mass black hole took around 100,000 years — a glitch in planetary times and a few hundred million years later, it had grown into a billion-solar-mass supermassive black hole.

This seemed to be much quicker than expected. Stars and galaxies in the early creation had been formed as molecular hydrogen cooled and flattened to primordial plasma of hydrogen and helium. This environment had limited black holes from growing very big since molecular hydrogen would turn gas into stars adequately far away to escape the black holes, gravitational pull.

Astronomers had come up with a number of methods that supermassive black holes could have overcome this obstacle. Haiman together with his colleagues, in their 2008 research had hypothesized that radiation from a considerable nearest galaxy could divide molecular hydrogen into a atomic hydrogen causing the nascent black hole together with its host galaxy to collapse instead of spawning new clusters of stars.

Research - Effects of Gravity/Fluid/Dynamics/Chemistry/Radiation

A study after this, headed by Eli Visbal a postdoctoral researcher a Columbia then had summed that the nearby galaxy could have been around 100 million times much bigger than the sun to emit adequate radiation in order to stop star formation.

 However, being comparatively rare, adequate galaxies of this size seemed to exist in the initial creation to describe the supermassive black holes witnessed so far. Presently the study, headed by John Regan, a postdoctoral researcher at Ireland’s Dublin City University, had displayed the procedure utilising software established by Columbia’s Greg Bryan wherein his study comprised of the effects of gravity, fluid dynamics, chemistry as well as radiation.

 Few days subsequently of crunching the numbers on a processer, the researchers established that the adjoining galaxy could have been smaller as well as closer than earlier assessed. A study co-author John Wise, the Dunn Family Associate Professor in Georgia Tech’s College of Physics, had commented that the nearby galaxy could not be too close, or too far away, and similar to the Goldilocks principle, excessively hot or cold.

Tuesday, January 17, 2017

Radio Signals Traced to Galaxy Billions of Light Years Away


radio signals form galaxy
The search for the extra territorial life isn’t new and it has been theme of a number of science fiction literature. The common theme showcased in discovering the life in space is to send or receive radio signals back from life far away in the galaxy. Over the years of extensive research astronomers are confident enough to pinpoint a number of fast radio signals burst which in coming from the deep space. Radio signals happens to be the best or most sophisticated way of sending information about our planet and to get relatively quick response if it is intercepted from someone lurking in the space. Now scientists and astronomers are confirming that they had received some radio signals from the planets billion light years away from Earth.

The signals from deeper space

The radio signal bursts emerged from the space is extremely short lived which blasts nothing more than a millisecond. This makes it extremely difficult to track and process even given the current scientific and technologies tools but scientists of hopeful of making progress in near future. Scientists are making use of Very Large Array present in New Mexico which is specifically a multi-antenna telescope. This telescope will help in determining the precise location of the radio signal flash.

This group of scientists originated from the McGill University in Montreal and Cornell University in New York. They had already published the finding in the reputed science journal called Nature. They had also presented the very same finding at the annual conference of American Astronomical Society in Texas which left everyone spellbound with the success made by the team. The approximate location of the emerging radio signal bursts has been named as FRB 121102 by the scientists.

On the path to success

FRB 121102 is being studied over six months by the scientists and it has helped in pinpointing its exact position in the galaxy. One of the scientists associated with this research at Cornell University named Dr. Shami Chatterjee has stated that the radio flashes coming from this location is emitting huge amount of energy which is visible even from 3 billion light years, though the reason behind these bursts is mystery for the scientists to unravel.

It has been speculated by the scientists that the burst is a result of jets of matters shooting out of a black hole. Such instances has been seen in the past where an exploding backhole can appear like shiny object in the galaxy with the ability to been billions of light years away. While some scientists believe it to a magnetar closed surrounded with wide amount of debris from a stellar explosion. Since 2007about 18 FRB has been discovered by the astronomers and scientists. FRB 121102 is unique as it is continuously showing bright bursts along with weaker radio emissions coming from its region. If their finding brings some more details regarding the burst of radio signals then they will move further towards uncovering the presence of life in the space.

Thursday, January 7, 2010

The unknown mystery about black hole!!!!!!!


What are black holes? You just imagine a void of very very small in size which is enormously dense which engulf the objects which comes with in its surroundings. Here a simple explanation for a black hole. Black hole is a star which collapsed under its own mass few times and it becomes more compact every time. Because of its enormously high density this endless chasm sucks everything with in its vicinity and absolutely nothing can escape from its attraction.

The name 'BLACK HOLE' was coined by John Weeler, a famous astrophysicist of American origin. While deriving the theory of relativity Albert Einstein told about the black holes but none of the scientist thought about it.

While we are discussing about a black hole, we are fully against the Newton's force of attraction between two objects.

For your convenience let me explain to you with sun as an example. If our sun has to be changed to be a black hole the following things has to be take place. First the diameter of the sun has to be compressed to make it a ball of one kilometer radius (now the diameter of Sun is 1392000Km) while doing so its density will be increased and hence it’s mass will be equal to 1000000000000000000000000000000 Kg. Similarly if you convert earth in to a black hole it will be a ball of 1cm radius and of mass 10 power 25Kg( 1 followed by twenty five zeros) Now the earth's diameter of earth is 12756Km.
Now I hope you have a brief outline about a black hole. Now let’s go through the general process of creation of black hole.

Stars are of huge balls of gases mostly Hydrogen. Their energy is derived from nuclear fusion of Hydrogen into Helium (Nuclear fusion is a clear source of energy occurs in very high temperature and pressure). Once the stars weight and the energy produced balances each other then they will be stable. They will not collapse as long as the energy production takes place the will be stars. But once the energy production reduced due to lack of fuels the stars implodes in on itself simultaneously its radius also reduce. After few collapses their radius reduced to a greater extent and becomes a black hole.

Here the problem for astrophysicist is discovering black hole in the universe. Since they are not visible we can not find them as visible object. But they can be finding out by using a different phenomenon of binary stars.

Binary stars are the two stars rotation around each other. If one star become a black hole the other will tumble down and will be absorbed, while it is absorbed there is a disc of dust called accretion disc form around the hole. The very hot matter inside the black hole is extremely accelerated and hence releases strong radio waves. Using these radio waves we can find the black hole. The velocity of disc rotation is directly proportional to the mass of the black hole.

According the scientists the galaxies rotate like a centrifuge. The total mass of the stars and other objects at the centre holds the stars in the outer edges hold them in place. Hence we can arrive at this following conclusion that the mass of all matter of stars is not sufficient to hold the very distant stars therefore some invisible gigantic black holes at the centre are exert force on the stars at the outer

Here a point to note: The time stops inside a black hole which is a unique and very important point in the space and time relationship.