Astronomers found a massive black hole’s in a dwarf galaxies, Astronomers who are looking for the mechanism that formed large black holes in the early history of the universe have received important new evidence when they found 13 such black holes in dwarf galaxies, less than a billion light years from Earth.
This dwarf galaxy is more than 100 times less massive than our own Milky Way is among the smallest galaxies with large black holes.
Scientists expect black holes in these smaller galaxies to be on average 400,000 times bigger than the mass of our sun.
We hope that their investigation and galaxies will give us an idea of how black holes in the early universe emerged through the merging of galaxies over billions of years and then grow to produce the supermassive black holes that we see in larger galaxies today, with masses of one million or billion times bigger than the sun, massive black hole’s in a dwarf galaxies, say researchers.
The scientists initially selected galaxy samples from NASA-Sloan Atlas, a catalog of galaxies created using visible light telescopes.
They chose galaxies with stars less than 3 billion times the mass of the Sun and about the equivalent of the Great Magellanic Cloud, a small satellite of the Milky Way.
From this sample, they chose candidates who could also be seen at the Weak Radio Sky (FIRST) National Radio Astronomy Observatory, made between 1993 and 2011. They then used VLA to create new and more sensitive ones. 111 resolution images of selected galaxies.
New VLA observations have shown that 13 of these galaxies have strong evidence of large black holes that actively absorb material. We were very surprised to see that black holes in about half of these 13 galaxies are not at the center of galaxies like in larger galaxies.
Scientists say this suggests that galaxies might have joined with others before in their history. This is in line with computer simulations that estimate that about half of the massive black holes in dwarf galaxies will migrate around the edges of their galaxies.
This work teaches us that we need to expand our search for large black holes in dwarf galaxies outside their centers to get a better understanding of populations and to find out what mechanisms formed the first large black holes in the early universe, he told researchers.