Scientists find exotic black hole deemed ‘needle in a haystack’ in neighbouring galaxy

An artist’s impression of the binary star system VFTS 243, which contains a black hole and a large luminous star orbiting each other.(Reuters: ESO/Luis Calcada/Handout)

Astronomers have spotted what they are calling a cosmic “needle in a haystack” — a black hole that not only is classified as dormant but appears to have been born without the explosion of a dying star.

Key points:

  • The black hole is about 160,000 light-years from Earth
  • Its mass is at least nine times greater than that of our Sun
  • Black holes are extraordinarily dense objects, with gravity so intense not even light can escape

Researchers said the black hole, in a galaxy adjacent to the Milky Way, differs from all other known black holes as it is “X-ray quiet” — not emitting powerful X-ray radiation indicative of it having gobbled up nearby material with its strong gravitational pull — and was not born in a stellar blast called a supernova.

Black holes are extraordinarily dense objects, with gravity so intense not even light can escape.

This one, with a mass at least nine times greater than our Sun, was detected in the Tarantula Nebula region of the Large Magellanic Cloud galaxy, and is located about 160,000 light-years from Earth. A light-year is the distance light travels in a year, about 9.5 trillion kilometres.

The newly discovered black hole and an extremely luminous and hot blue star with a mass about 25 times that of our Sun are orbiting each other, creating a “binary system” which has been named VFTS 243. The researchers believe the companion star will also eventually become a black hole, which could merge with the current one.

Dormant black holes, thought to be relatively common, are hard to detect because they interact very little with their surroundings. Numerous prior proposed candidates have been debunked after further study, including by members of the team that uncovered this one.

“The challenge is finding those objects,” said Tomer Shenar, a research fellow in astronomy at Amsterdam University and lead author of the study published in the journal Nature Astronomy.

“It’s the first object of its kind discovered after astronomers have been searching for decades,” said astronomer and study co-author Kareem El-Badry, of the Harvard & Smithsonian Center for Astrophysics.

The researchers used six years of observations from the European Southern Observatory’s Chile-based Very Large Telescope.

There are different categories of black holes. The smallest, like the newly detected one, are so-called stellar-mass black holes, formed by the collapse of massive individual stars at the ends of their life cycles. There are also intermediate-mass black holes, as well as the enormous supermassive black holes residing at the centre of most galaxies.

“Black holes are intrinsically dark objects. They do not emit any light. Therefore, in order to detect a black hole, we usually look at binary systems in which we see one luminous star moving around a second, not-detected object,” said study co-author Julia Bodensteiner, a postdoctoral research fellow at the European Southern Observatory in Munich.

It is typically assumed that the collapse of massive stars into black holes is associated with a powerful supernova explosion. In this case, a star perhaps 20 times our Sun’s mass blew some of its material into space in its death throes, then collapsed in on itself without an explosion.

“Black holes can only be mercilessly ravenous if there is something close enough to them that they can devour. Usually, we detect them if they are receiving material from a companion star, a process we call accretion,” Dr Bodensteiner said.

Dr Shenar added: “In so-called dormant black hole systems, the companion is far enough away that the material does not accumulate around the black hole to heat up and emit X-rays. Instead, it is immediately swallowed by the black hole.”

Source: ABC News