Tech & Science : A Cool, Gassy Ring Has Been Detected Around Our Galaxy's Gigantic Black Hole - - PressFrom - Australia
  •   
  •   

Tech & Science A Cool, Gassy Ring Has Been Detected Around Our Galaxy's Gigantic Black Hole

03:40  06 june  2019
03:40  06 june  2019 Source:   gizmodo.com.au

Samsung teamed up with Disney for a series of brilliant Galaxy S10 wallpapers

Samsung teamed up with Disney for a series of brilliant Galaxy S10 wallpapers When Samsung first showcased the Infinity-O display, with its signature hole-punch design, the discussion revolved around whether or not Samsung's idea was preferable to the iPhone X-style notch. 

The immediate area surrounding the supermassive black hole is kind of intense. Called Sagittarius A*, this behemoth has a mass around 4 million times Much of the gas collected by Sagittarius A* orbits the black hole in an accretion disk. This donut-like ring extends from the black hole ’ s event horizon

The black hole is 500 million trillion km away and was photographed by a network of eight Image caption Astronomers have suspected that the M87 galaxy Called Sagittarius A*, this behemoth has a mass around 4 million times that of our Sun. As befits a supermassive black hole of that size, it has

A Cool, Gassy Ring Has Been Detected Around Our Galaxy's Gigantic Black Hole© Image: NRAO/AUI/NSF; S. Dagnello Artist’s impression of the accretion disk surrounding the supermassive black hole at the center of the Milky Way galaxy. (Image: NRAO/AUI/NSF; S. Dagnello) Using the ALMA observatory, scientists have detected a previously undocumented band of cool gas wrapped around the black hole at the core of our galaxy.

The immediate area surrounding the supermassive black hole is kind of intense. Called Sagittarius A*, this behemoth has a mass around 4 million times that of our Sun. As befits a supermassive black hole of that size, it has managed, through its intense gravitational influence, to collect an assortment of cosmological wonders, including wayward stars, troves of interstellar dust, and various gases.

Samsung teamed up with Disney for a series of brilliant Galaxy S10 wallpapers

Samsung teamed up with Disney for a series of brilliant Galaxy S10 wallpapers When Samsung first showcased the Infinity-O display, with its signature hole-punch design, the discussion revolved around whether or not Samsung's idea was preferable to the iPhone X-style notch. 

Black holes are objects so dense that beyond a zone called the event horizon, their gravitational field warps space to the point that light can’t escape. More in Sagittarius A & black holes . A Cool , Gassy Ring Has Been Detected Around Our Galaxy ' s Gigantic Black Hole .

When you see a Tweet you love, tap the heart — it lets the person who wrote it know you shared the love. Spread the word. The fastest way to share someone else’ s Tweet with your followers is with a Retweet.

A Cool, Gassy Ring Has Been Detected Around Our Galaxy's Gigantic Black Hole
Credit Cards Are Now Offering 0% Interest Until 2020
Find out more on Finder
Ad Finder.com.au

Much of the gas collected by Sagittarius A* orbits the black hole in an accretion disk. This doughnut-like ring extends from the black hole’s event horizon to a few tenths of a light-year away. Astronomers had previously detected a blazingly hot band of gas within this accretion disk, which—weirdly—didn’t show any signs of rotation around the black hole. New research published today in Nature now describes a disk of cool interstellar gas, along with evidence of movement within the accretion disk.

“We were the first to image this elusive disk and study its rotation,” Elena Murchikova, the lead author of the new paper and an astrophysicist at the Institute for Advanced Study in Princeton, said in a release from the National Radio Astronomy Observatory.

Astronomers discover massive ring of gas circling our black hole

Astronomers discover massive ring of gas circling our black hole The center of the Milky Way galaxy is somewhere you wouldn't want to be. We have it pretty easy here on Earth, orbiting our star and staying out of everyone's way, but deep within the heart of our galaxy, a monster lurks. It’s a supermassive black hole known as Sagittarius A* (that’s pronounced “A star”, for the record) and while we can’t exactly see it, we know it’s there thanks to decades of scientific observations of our own galaxy as well as many others. The intense gravitational pull of the black hole draws in just about everything, but nearby debris it hasn’t yet swallowed up orbits in a pattern called an accretion disk.

Using the ALMA observatory, scientists have detected a previously undocumented band of cool gas wrapped around the black hole at the core of our galaxy

A Cool , Gassy Ring Has Been Detected Around Our Galaxy ' s Gigantic Black Hole . The narratives around John Z. DeLorean usually go one of two ways. He’s either remembered as an iconoclastic hero of American motoring, a David who fought one Goliath after another until he lost

As noted, astronomers had previously captured evidence of the hot portion of the gaseous ring. And by hot, we’re not kidding. Its temperature is around 10 million degrees Celsius (18 million degrees Fahrenheit), which is two-thirds the temperature found at the core of the Sun. When gas gets this hot, it emits X-ray light that can be detected from Earth. Astronomers had also previously detected cooler gas near the black hole, but nowhere near the accretion disk.

To be clear, the “cooler gas” is just cool by comparison; it’s still around 10,000 degrees Celsius. The relationship, if any, between this cool gas and the hot gas within the nebulous disk is not known.

But as the new research shows, cooler gas also exists in close proximity to the supermassive black hole. Using the ALMA telescope in Chile’s Atacama desert, the astronomers detected the faint millimetre-wavelength signals emanating from a cool ring of gas. These signals—the result of radiation on hydrogen atoms—travelled 26,000 light-years to Earth with barely any degradation along the way. The result is the first-ever image of the cooler gas disk. Incredibly, it’s located one hundredth of a light-year away from Sagittarius A* and is roughly 20,000 times the diameter of the black hole.

Astronomers Measure Tiny Black Hole In Nearby Galaxy

Astronomers Measure Tiny Black Hole In Nearby Galaxy A newly discovered black hole in a nearby dwarf galaxy could provide scientists a deeper understanding of how its larger counterparts were formed. According to researchers, the black hole’s small size makes it easier to measure and study than the larger ones. The black hole was discovered at the center of the galaxy NGC 4395 by a team of researchers including astronomer Elena Gallo of the University of Michigan. The results of their study were published in the scientific journal Nature Astronomy.

There are many types of galactic nuclei at the center of most galaxies , the supermassive black holes . Some blaze brilliantly as they spin gas, spinning into Some are much slower, as the Sagittarius A * core of the Milky Way, a supermassive black hole tipping the scales four million times the Sun’ s mass.

Scientists have detected radio waves emanating from the space between a pair of galaxy clusters—evidence of intergalactic magnetic fields and fast-moving particles Share This Story. More in cosmology. A Cool , Gassy Ring Has Been Detected Around Our Galaxy ' s Gigantic Black Hole .

A Cool, Gassy Ring Has Been Detected Around Our Galaxy's Gigantic Black Hole© Image: ALMA (ESO/NAOJ/NRAO), E.M. Murchikova; NRAO/AUI/NSF, S. Dagnello ALMA image of the cool gas within the accretion disk. Areas in blue are moving toward us, while the regions in blue are moving away—evidence that the accretion disk is spinning around the black hole, which is shown by the crosshair. (Image: ALMA (ESO/NAOJ/NRAO), E.M. Murchikova; NRAO/AUI/NSF, S. Dagnello)

The ALMA data also allowed Murchikova and her colleagues to track the location and motion of the gas within the accretion disk. Owing to the radio light doppler effect, which produces shifts of blue (moving away from us) and red (moving toward us), the astronomers were able to see that the gas was slowly rotating around the black hole. The amount of hydrogen within the cool area of the disk was estimated at around one-tenth the total mass of Jupiter.

Importantly, these observations provide new insights into how the supermassive black hole at the center of the Milky Way collects and devours surrounding matter. In the new study, the researchers estimate that Sagittarius A* gobbles up a relatively tiny amount of matter—less than half a per cent of the mass of the Moon per year.

Rare star explosion gave rise to the gold in your electronics, study says

Rare star explosion gave rise to the gold in your electronics, study says Thought your fancy gold and platinum came from a collision of neutron stars? Oh, that is so 2017

A Cool , Gassy Ring Has Been Detected Around Our Galaxy ' s Gigantic Black Hole . The narratives around John Z. DeLorean usually go one of two ways. He’s either remembered as an iconoclastic hero of American motoring, a David who fought one Goliath after another until he lost

That our galaxy is warped was already known, but the new research further characterizes the surprising extent of these distortions. More in Milky Way. A Cool , Gassy Ring Has Been Detected Around Our Galaxy ' s Gigantic Black Hole .

These new observations are exciting, but Murchikova said “we still have no good understanding of how” the accretion process actually works at Sagittarius A*. A deeper dive into the new ALMA data, plus observations by other observatories, will hopefully reveal more about the monster parked at the core of our galaxy.

Pictures: Images from the International Space Station

A Cool, Gassy Ring Has Been Detected Around Our Galaxy's Gigantic Black Hole
Read more

Something Appears to Have Ripped a Massive Hole in the Milky Way's Edge.
Something appears to have torn a hole in part of the Milky Way’s halo. The “dark substructure” was found via Gaia observations—a project set out to produce the most detailed 3D map of our galaxy—with Harvard scientist Ana Bonaca noticing a perturbation in a tidal stream. She presented her findings at the American Physical Society’s April meeting. As first reported by LiveScience, Bonaca was focusing on tidal streams produced by stars escaping from globular clusters—normally found at the edges of a galaxy. The stellar halo of the Milky Way is full of these tidal streams.

—   Share news in the SOC. Networks

Topical videos:

usr: 3
This is interesting!