Black holes can be so docile, astronomers work with a new size range


Are supermassive black holes. There ExtremelyMassive black hole. How big can these strange objects be? Well, there can be something bigger than ultramassive: Foolishly According to the latest research, large black holes.

Such fictional black holes – 100 billion times larger than the mass of the Sun – have been discovered in a new paper that gives them the name SLABs, an abbreviation that stands for “Stupondly Lored Black Hole”.

Astronomer Bernard Carr from Queen Mary University London reported, “We already know that black holes exist in a vast range of the general public, with 4 million solar mass black holes that reside in the center of our own galaxy.”

“While there is currently no evidence for the existence of SLABs, it is conceivable that they may exist and that they may also remain outside of galaxies in intergalactic space, with interesting observational results.”

Black holes have only somewhat broad mass ranges. Stellar-mass black holes are; They are black holes that are around the mass of a star, up to about 100 solar masses. The next category is above intermediate-scale black holes, and how large they become depends on who you talk to. Some say 1,000 solar masses, some say 100,000, and others say 1 million; Whatever the upper limit, these seem to be very rare.

Supermassive black holes (SMBHs) are very large on the order of millions to billions of solar masses. These include the SMBH at 4 million solar masses at the center of the Milky Way, Dhanu A *, and the most photogenic SMBH at Universe, M87 * at 6.5 billion solar masses.

The largest black hole we have found is ultramassive, with 10 billion (but less than 100 billion) solar masses. These include an ultimate animal clock measuring 40 billion solar masses in the center of a galaxy called Holmberg 15a.

“However, surprisingly, the idea of ​​SLABs has been largely neglected until now,” Carr said.

“We have presented options for how these SLABs can become, and hope that our work will begin to inspire discussions among the community.”

The thing is, scientists do not know how large black holes actually form and grow. One possibility is that they form in their host galaxy, then grow up by blowing up massive stars and a whole sludge of gas and dust, and colliding with other black holes when the galaxies merge.

The upper limit of this model is about 50 billion solar masses – this is the limit at which the singular mass of the object needs an accretion disk, causing it to disintegrate extensively under its own gravity. But there is also an important problem: Supermassive black holes have been found in the Super Universe on a large scale that grew out of this relatively slow process in the time after the Big Bang.

Another possibility is that some are called primordial black holes, proposed in 1966. This theory suggests that the pockets could be so dense due to the varying density of the early Universe, that they collapsed into black holes. These will not be subject to the reduction of black hole size from falling stars, and may be extremely small or, on a very large scale.

Extremely small, if they ever existed, would probably have evaporated by Hawking radiation by now. But many, many people could have survived.

Therefore, based on the primordial black hole model, the team calculated how massive these black holes could be between 100 billion to 1 quintillion (i.e. 18 zeros) of solar mass.

The purpose of the paper, the researchers said, was to consider the impact of such black holes on the space around them. We may not be able to see SLAB directly – black holes that are not collecting material are invisible, because light cannot escape their gravity – but largely invisible objects can still be detected That depending on the way they behave around them.

For example, gravity curves space-time, which causes light to pass through regions that also follow a curved path; This, the team said, is called a gravitational lens, and the effect can be used to detect SLABs in space.

Massive objects will also have implications for detecting dark matter, the invisible mass that is injecting more gravity into the universe than it should – which we can actually detect directly.

An imaginary dark matter candidate, weakening the mass particles (WIMPs), will accumulate in the vicinity of a SLAB due to a gravity, at such concentrations that they collide and annihilate each other. , Will form a gamma-radiation halo.

And primitive black holes themselves are also candidates for a dark matter.

“SLABs could not provide themselves with dark matter,” Carr said. “But if they all existed, it would have important implications for the early universe and would make it plausible that a lighter primordial black hole could do so.”

Furthermore, we could not calculate the size of a black hole with 1 quintal solar mass. The event horizon will be over 620,000 light years. Uh. Stubborn

The team’s research has been published in Monthly notice of the Royal Astronomical Society.

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