Hole-y guacamole.
Scientists have quantified the energy produced by the first black hole ever discovered, revealing that it spews “dancing” jets that shine as bright as thousands of suns and travel 335 million mph — half the speed of light, per an illuminating study in Nature Astronomy.
“These jets are thought to be among the most energetic phenomena in the cosmos,” wrote the study’s head author Steve Prabu, a radio astronomer at the University of Oxford, in a piece for The Conversation.
First spotted 60 years ago, when scientists were unsure whether black holes existed, the interstellar void Cygnus X-1 is situated approximately 7,000 light-years from Earth in the constellation Cygnus, Livescience reported.
Illustration of a black hole system with a blue star, an orange and red accretion disk, and a white jet of plasma. Vimeo / ICRARThe black hole’s mass clocks in at approximately 21 times larger than the sun and it’s locked in a binary orbit with a companion star called HDE 226868 that’s nearly twice as big. The pair twirl about each other every 5.6 days.
Like most black holes, Cygnus X-1 emits dual jets comprised of plasma generated by its accretion disc — a spinning vortex of gas, dust and other matter that glows intensely while being rent asunder.
These streams get spouted outward by the black hole’s magnetic field, forming one of the most powerful phenomenons in the universe.
The jets produced by black holes are some of the most energetic phenomena in the universe. Vimeo / ICRARWhile previously unable to gauge their energy output, the researchers have managed to measure the jet-streams of Cygnus X-1 thanks to its proximity to HDE 226868. The black hole’s partner star buffets the hets with stellar winds made up of charged particles, causing them to bend or wobble — a phenomenon Pruba has termed “dancing.”
Due to beams’ constant movement, the sashaying streams have been difficult to track– until now.
By combining images captured by radio telescopes across the world, the team was able to paint a more accurate picture.
They found that the jets travel the aforementioned half-light-speed velocity and generate power that glows as bright as 10,000 suns.
“A key finding from this research is that about 10 per cent of the energy released as matter that falls in towards the black hole is carried away by the jets,” Prabu said in the statement. Visible light component of Cygnus X-1, a rich source of X-rays in the constellation Cygnus, with a red nebula. APBy quantifying the jets’ energy output, researchers are able to gauge the rate at which a black hole is feeding and growing.
“A key finding from this research is that about 10 per cent of the energy released as matter that falls in towards the black hole is carried away by the jets,” Prabu said in the statement.
This was essential as until now, scientists did not have a reliable way to deduce how much was being expelled, only how fast it was consuming — which they gauge by measuring X-rays released by the matter falling in. Combining these two data points gives researchers the black hole’s total “energy budget.”
Study co-author Professor James Miller–Jones, of Curtin University told the Daily Mail that this was a “a bit like counting calories, only for a black hole.”
On a grander scale, the activity of these jets can help shed light on how black holes influence the evolution of the universe itself.
“When matter falls towards a black hole, part of it contributes to the growth of the black hole itself,” the researchers wrote. “But a significant fraction can be redirected into jets, which inject energy back into their surroundings.”
They added, “For the most massive black holes at the centers of galaxies, the jets can shape their host galaxies and influence even larger cosmic structures.”
