A Black hole have always been a mystery to us. A phenomenon that consumes light has always surprised us. After years of research we have gathered enough knowledge to say what black holes are. Scientists could even predict the physical properties of a black hole. Black holes are getting created constantly, as because every star creates a possibility of a black hole.
What Is A Black Hole?
A black hole is a space in place where the gravitational force is so much that even light can not escape and gets sucked in. A black hole starts forming when a star starts dying.
How Big Is A Black Hole?
A black hole could be as small as an atom with mass of a mountain or could be of a mass equals 20 times the mass of Sun. The bigger ones have been categorized as “Stellar”. However there could be even bigger and massive black holes with mass 1 million times that of Sun. These are called supermassive black holes. Based on proof gathered by the scientists there could be many “Stellar” black holes in a galaxy and only one “Supermassive” black hole at the center of a galaxy. The Supermassive black hole at the center of our galaxy milky way is called Sagittarius A* (Pronounced as Sagittarius A-Start).
What Is The Latest Discovery?
The hunt for the biggest black hole has been on for quite some time but recently what has been found is unbelieveable, A black hole possibly bigger than a standard galaxy. This discovery has shaken the astro-scientists because it seems impossible, as if the child born is bigger than the mom. But its understood to be a reality!! No one could deny it based on research results and proofs being produced.
This galaxy was first discovered with NASA’s Spitzer Space Telescope using infrared filters. As per analysis this is at least 9 billion years old and around 2 billion light years away. This galaxy always contained an active galactic nucleus (AGN) responsible for black holes. It is actually a very bright object resulting from the accretion of gas by a central supermassive black hole. This is seen when the tremendous gravitational pull of the black hole forces the gases to emit light.
Scientists are now able to confirm the presence of black hole by reading the high speed movement at which the gases are moving because it is not a normal phenomenon. This is only possible if there is a black holes attracting everything towards it. Using the South African Large Telescope NASA Scientists observed the emission line of hydrogen and the way the hydrogen ion split forming different colors thus enabling us to find the wavelength of light with the help of Doppler effect. Scientists were able to calculate the size of the black hole as well.
This photo of Southern Africa Large Telescope is courtesy of TripAdvisor.com
The mass of the black hole is directly proportional to the emission line. The black hole at the center of galaxy SAGE0536AGN has been recently found to be 350 million times the mass of the Sun, which is way more than a standard “supermassive” black hole. The mass of the galaxy itself, obtained through measurements of the movement of its stars, has been calculated to be 25 billion solar masses. This is just seventy times larger than that of the black hole, but the black hole is still thirty times larger than expected for this size of galaxy.
“Galaxies have a vast mass, and so do the black holes in their cores. This one though is really too big for its boots — it simply shouldn’t be possible for it to be so large,” said Dr Jacco van Loon, an astrophysicist at Keele University and the lead author on the new paper.
This type of event has been discovered for the first time. This is creating new routes for new theories and will also pave new paths for new discoveries. In ordinary galaxies the black hole would grow at the same rate as the galaxy, but in case of SAGE0536AGN either the black hole has grown much faster, or the galaxy stopped growing prematurely. So scientists have to find new avenues and new technologies to understand this event even better.
With every such discovery new unwritten chapters of space is opening up. We hope more chapters on our root, newer and stronger stories of our origin will be uncovered soon and we will certainly step in to a new era of more stronger belief on how we came in reading back the facts and evidences on how the earth was created and even beyond through the solar system to the beginning of time…is it still the most heard “Bing Bang Theory” (The Theory of how the universe might have began) or something else!
Publication: Jacco Th. van Loon and Anne E. Sansom, “An evolutionary missing link? A modest-mass early-type galaxy hosting an oversized nuclear black hole,” MNRAS (November 01, 2015) 453 (3): 2341-2348; doi:10.1093/mnras/stv1787
Author : Tanujit Paul