Astronomers Spot Unprecedented Flashes From Our Galaxy's Black Hole
13 August, 2019, 15:12 | Author: Darnell Taylor
Nearly 26,000 light years from Earth, Sagittarius A* - or Sgr A* - is typically fairly restrained as supermassive black holes go, but this past summer that has all been flipped.
The supermassive black hole Sagittarius A* located in the middle of the Milky Way.
At the heart of our home galaxy is a supermassive black hole that gobbles up anything that gets too close.
The sudden blast of brightness caused the black hole to grow 75 times brighter than usual levels, before returning to normal according to the scientists.
"The black hole was so bright I at first mistook it for the star S0-2, because I had never seen Sgr A* that bright", astronomer Tuan Do from the University of California Los Angeles told ScienceAlert about the observations. Currently, we do not possess the technology necessary to detect radiation emitted directly by black holes, but we can observe the effects its gravitational force has on the surrounding objects, causing enormous friction, which produces radiation.
A group of scientists, who have been studying the space giant for 20 years, have just revealed findings that show that back in May, Sagittarius A* was the brightest we've ever seen. It's under constant observation with instruments like the WM Keck Observatory in Hawaii used by the UCLA team. It's thought to be at least twice as large as the previous largest black hole detected by scientists.
The team is busily gathering data to try and narrow it down, but there are two immediate possibilities. In fact, researchers believe the black hole in Holm 15A is at least 10,000 times as massive as our home galaxy's black hole. That's the mass of materials - including gases and dusts - that are drawn to the black hole but don't make it past the event horizon.
But - have a look at the timelapse again. That's S0-2, a star on a long, looping, 16-year elliptical orbit around Sgr A*. They said the increase in brightness could suggest a change in activity at the supermassive black hole. Last year, it made its closest approach, coming within 17 light-hours of the black hole.
Researchers say, though the event much brighter than any other observed in human history, it may have been even brighter than the data lets on since its peak brightness was captured at the start of the telescope's imaging.
'One of the possibilities is that the star S0-2, when it passed close to the black hole past year, changed the way gas flows into the black hole, and so more gas is falling on it, leading it to become more variable, ' Do told ScienceAlert. They are now being collected, across a larger range of wavelengths. Another team of astronomers operating the European Southern Observatory's Very Large Telescope have also measured the light-stretching effects of the black hole (they call the star S2, but it's the same star).
The paper has been accepted into The Astrophysical Journal Letters, and is available on arXiv.
By this time there were already rumours flying around in online trading forums that Burford was the target of the upcoming report. The spoofer immediately cancels the sell order before the sale takes place, and places a new sell order at an even lower price.
The children haven't been formally identified, but the Erie Fire Department said the dead range in age from 8 months to 7 years. Two boys, said to be Harris' sons, suffered minor injuries jumping from upper floor windows in the two story wood-frame house.
Alisson's loss for an extended period would represent a blow to the club he joined from Roma in a £65million switch last summer. After the Chelsea game in Istanbul, Liverpool faces Southampton on Saturday and Arsenal a week later.
Cuomo asked a man who could be seen in the video. "I'll fucking throw you down these stairs like a fucking punk". The claim in that tweet that Rush Limbaugh calls Cuomo Fredo are backed up by these transcripts .
December 5 - Former MVPs James Harden and Russell Westbrook play lone Toronto game with Houston on Giants of Africa night. It's a reversal of last season, which began with the Sixers visiting the Celtics in Boston (with the Cs winning).
A woman was crushed by two cars last night near Hyde Park Corner after an altercation with a driver of a blue Evoque. The Daily Mail reports that the driver of the Mercedes was tasered and led away in handcuffs by the police .
Faced with this situation, the bank reduced its USA growth forecast for the fourth quarter by 20 basis points to 1.8 percent. He said that despite the risks, a crisis of the magnitude seen during the previous recession "would be a great surprise".
But booming USA shale oil production continues to chip away at efforts to limit the global supply overhang, weighing on prices. Tensions between the United States and Iran were also seen contributing to firming oil prices, analysts said.
Swift's seventh studio album, Lover , debuts on August 23, and will have four deluxe editions of the album available at Target. Swift was presented with the Icon Award in the traditional surfboard shape synonymous with the award show. "It's not resolved.
System Shock 2 Enhanced Edition Confirmed
System Shock 2 Enhanced Edition coming soon! We know little and less about System Shock 2 Enhanced Edition at this stage. Watch the System Shock 2 20th anniversary celebration live Twitch stream here.
OnePlus TV to launch in late September, says report
And, a year after the announcement, the Chinese smartphone maker is not too far from launching its first commercial smart TV. The brand is expected to launch its televisions in at least four sizes - 43-inches, 55-inches, 65-inches, and 75-inches.
Former NBA point guard sentenced to 3.5 years in prison
In total, they found three loaded pistols, a gas-operated submachine gun, extended magazines, ammunition and the ballistic vest. Telfair appeared in front of a jury on Monday, pleading the judge, "Please don't take me from society right now".