Tuesday, 25 February, 2020

The New Found Black Hole Is Monstrous in Size

Provided by Space An artist's depiction of the giant stellar-mass black hole LB1 accreting gas from a nearby blue companion star Provided by Space An artist's depiction of the giant stellar-mass black hole LB1 accreting gas from a nearby blue companion star
Sandy Nunez | 04 December, 2019, 12:41

In a cataclysmic explosion known as a supernova, it blows off its outer layers, leaving behind a 4-5 solar mass core, which collapses in on itself to form a black hole.

An artist's impression of a massive black hole and the accretion disk it has gathered as its intense gravity pulls matter off of a blue companion star.

"That means that this is a new kind a black hole, formed by another physical mechanism!"

Liu said the research team aims to utilize the LAMOST to discover almost 100 black holes within the Milky Way in the coming five years. It is about eight times more massive than our sun and it appears to complete an orbit around a seemingly invisible black hole every 79 days. LB-1's sheer size suggests that it "was not formed from the collapse of only one star", the study said - instead, it could potentially be two smaller black holes orbiting each other. Finding a black hole significantly larger than 25 solar masses is perplexing, to say the least.

Black holes of such mass should not even exist in our Galaxy, according to most of the current models of stellar evolution.

All things considered, the Chinese-drove group noticed that, if LB-1 were nearer, it would be less glowing and less monstrous - and its watched temperature can't be clarified with less radiance. However, this could force a significant rethink of how stellar black holes are born. Recently, the Laser Interferometer Gravitational-Wave Observatory (LIGO) and Virgo gravitational wave detectors have begun to catch ripples in space-time caused by collisions of black holes in distant galaxies. Large Sky Area Multi-Object Fiber Spectroscopic Telescope or LAMOST was used by them to search the black hole.

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How far away is it? If it's closer, and therefore less luminous, then it's also less massive.

These twin discoveries - the collision, and now LB-1 - indicate that scientists are reaching "a renaissance in our understanding of black hole astrophysics", said Reitze in the press release.

"We thought that very massive stars with the chemical composition typical of our galaxy must shed most of their gas in powerful stellar winds, as they approach the end of their life".

The "monster" black hole LB-1 is not the largest black hole ever discovered but is possibly the largest of its type. A light-year is defined as the distance light travels in one year, which is around 6 trillion miles. As a result, only about two dozen Galactic stellar black holes have been well identified and measured.

The newly discovered black hole has become one of the topics of interest in the Milky Way and researchers are expected to carry on a series of follow-up observations to understand it. LIGO director David Reitze said the latest discovery has forced us to re-examine our models which describe the formation of black holes.