Astronomers baffled by distant galaxy that doesn't have any dark matter
Mar 30, 2018, 01:18
That is, except for one.
DF2 is located in a cluster of galaxies that is dominated by a giant elliptical galaxy designated NGC 1052.
Every galaxy that has been spotted contained a dark matter signature. Similarly, MOND theorists expect to find the most significant observable effects of their modified laws in less massive galaxies like NGC 1052-DF2, and lesser effects in more-massive galaxies.
The slower the objects in a system move, the less mass there is in that system.The team's calculations show that all of the mass in the galaxy could be attributed to the mass of the stars, which means there is nearly no dark matter in NGC1052-DF2."If there is anydark matter at all, it's very little". The researchers initially used Dragonfly to study a different galaxy, one appearing to possess an nearly inconceivably gargantuan amount of dark matter, which was a weird result in and of itself.
The galaxy has very few stars, but many of them are grouped together in unusually bright clusters.
Astronomers have discovered something unusual and unique out in the universe - a galaxy with virtually no dark matter - and perhaps even stranger still, this discovery offers up a validation that dark matter actually exists! Yet that is what Yale University astronomer Pieter van Dokkum and his colleagues have just found, they report in a study published Wednesday in Nature. "This thing is astonishing", said team member Pieter van Dokkum, "a huge blob that you can look through". The team are now turning to look at other ultra-diffuse galaxies to see whether any others are similarly deficient in dark matter. "It is literally a see-through galaxy", he added.
Since 1884 astronomers have invoked dark matter to explain why galaxies do not fly apart, given the speed at which they move within galaxies. "After that, everything else happens: Gas falls into the dark matter halos, the gas turns into stars, they slowly build up, then you end up with galaxies like the Milky Way".
In fact, the best fit for the motion of the globular clusters is a galaxy with no dark matter at all, although the uncertainties are high enough that there could be equal amounts of matter and dark matter present. From those measurements, the team calculated the galaxy's mass. "How do youform such a thing?"
If the current theory is wrong, that will also affect the strategies of the experiments trying to catch dark matter particles on Earth, says Bullock. Yet in this unusual galaxy, the projected signatures of these exotic effects are not seen.
The researchers next used NASA'sHubbleSpace Telescope and the Gemini Observatory in Hawaii to uncover more details about the unique galaxy. Notwithstanding a blend of ordinary matter, like stars and planets and manatees, galaxies are required to contain dark matter, an undetectable substance that makes up a large portion of the mass in the universe.
The galaxy is about 65 million light-years away in the constellation of Cetus and is about the same size as the Milky Way. Dark matter - matter that we know is there from its effects on gravity, but which emits no radiation that we've been able to detect - is so abundant in our universe that it far outweighs normal matter. Another idea is that it formed from matter spewed out by quasars.
As it has greater mass than normal matter, dark matter is believed to hold the necessary gas together while galaxies are forming.
Ultra-Diffuse galaxies had been identified previously in other galaxy clusters. The object which has been scientifically named as NGC1052-DF2 seems to have no dark matter at all in its vicinity.
Shortly after, Puigdemont was detained in Germany after he crossed the border with Denmark on his way from Finland to Belgium . However, First Minister Nicola Sturgeon has insisted she can not intervene in an independent legal extradition process.
Some protesters in Moscow shouted slogans calling for the sacking of Kemerovo's region and for " Russia without Putin". Russian newspapers ran heart-wrenching accounts of children's last minute calls to their parents and relatives.
Most mock drafts have Porter projected to be picked in the top 10 of the draft, which will be held on June 21. Porter has the great blend of size and mobility that fits today's National Basketball Association .
I look forward to talking to her about her NY state gubernatorial bid", Parker said through her spokesperson. But while Cuomo has $30 million to work with, Nixon does have celebrities like Parker on her side.
Asked what the honor would mean to him, Allen said: "It would be the culmination of my whole life, everything coming together". Not only that, but being an 8-time All-Star and 7-time All-NBA player makes this an easy choice for the Hall of Fame .
A source close to the investigation said the driver's motivations were unclear, but that the incident was being taken seriously. The driver " deliberately drove " the Peugeot auto into the group of soldiers , Le Dauphine said , citing its sources.
In this photo taken Wednesday March 28, 2018, former French President Nicolas Sarkozy leaves after a ceremony for late Lt. He already faces trial on separate charges of illicit pending overruns during his failed re-election campaign in 2012.
As per a report , violence erupted on March 26 morning when stones were pelted at a Ram Navami procession in Hill Bustee area. We celebrate Durga Puja, Kali Puja, Ganpati puja peacefully. "We also celebrate Ramzan, Christmas", she stated.
We are temporarily suspending the testing of our self-driving cars on public roads to learn from the Uber incident. Nvidia (NASDAQ: NVDA ) announces the Drive Constellation system for running self-driving vehicle simulations.
On the big day, anyone wishing to see the royal procession take place through Windsor will be subject to searches by the police. Kensington Palace confirmed last week that guests had been invited to a service at St.
He had 1,675 yards passing with 7 touchdowns and 7 interceptions with the Cleveland Browns during the 2014 and 2015 seasons. Heisman trophy victor and former first round draft pick Johnny Manziel is attempting to make a comeback into the NFL .
Shabani, 25, was last seen on security camera around 1:15 p.m. on February 23 near her Hollywood home, police said. She came from Macedonia and had been in Los Angeles less than two years, according to her friends.
LeBron matches MJ's double-digit scoring mark
James, who began his streak on January 6, 2007, can break Jordan's record Friday night at home against the New Orleans Pelicans . The first-quarter hit caused a front tooth subluxation - meaning the tooth is loose but not displaced.