[Communicating science series]
Today my post celebrates another science communicator, Fraser Cain, and his YouTube channel by the same name. This week, I noticed his video “Two Supermassive Black Holes Orbiting Each Other. Stephen Hawking Was Right!” (May 11, 2020). Well-done visualization.
His channel description says:
Space and astronomy news from Fraser Cain, publisher of Universe Today and co-host of Astronomy Cast.
If you’re a fan of space, sci-fi and pop culture, you’ll love our Guide to Space. These short videos come out every Monday and Thursday and answer a burning question that astronomy fans want to know. We talk about black holes, galaxies, the Universe, and the search for aliens.
Cain teamed up with a science teacher for the book The Universe Today Ultimate Guide to Viewing the Cosmos: Everything You Need to Know to Become an Amateur Astronomer (published October 23, 2018), a resource for viewing the Night Sky.
David Dickinson is an Earth science teacher, freelance science writer, retired USAF veteran and backyard astronomer. He currently writes and ponders the universe as he travels the world with his wife.
Fraser Cain is the publisher of Universe Today. He’s also the co-host of Astronomy Cast with Dr. Pamela Gay. He lives in Courtenay, British Columbia.
Wiki: Binary black hole (BBH).
And here’re some more questions about black hole systems.
So, most, if not all, black holes spin; and around them are spinning accretion disks of matter which feed those black holes. How fast is the spin in each case?
Or, how fast can matter fall into a black hole? That’s the question addressed in this article (below). The geometric alignment of a black hole system is important.
Royal Astronomical Society > “Matter falling into a black hole at 30 percent of the speed of light” (2018).
A UK team of astronomers report the first detection of matter falling into a black hole at 30% of the speed of light, located in the centre of the billion-light year distant galaxy PG211+143. The team, led by Professor Ken Pounds of the University of Leicester, used data from the European Space Agency’s X-ray observatory XMM-Newton to observe the black hole. Their results appear in a new paper in Monthly Notices of the Royal Astronomical Society.
Until now it has been unclear how misaligned rotation might affect the in-fall of gas. This is particularly relevant to the feeding of supermassive black holes since matter (interstellar gas clouds or even isolated stars) can fall in from any direction.
YouTube > Uni of Leicester > “Computer simulation predicts matter plunging into a black hole at extreme velocity” (Sep 17, 2018).
X-rays are so cool, eh.