Researchers solve mystery of the galaxy with no dark matter

Researchers solve mystery of the galaxy with no dark matter
Credit: Instituto de Astrofísica de Canarias

A group of researchers from the Instituto de Astrofísica de Canarias (IAC) has clarified a 2018 mystery in the field of extragalactic astrophysics: The supposed existence of a galaxy without dark matter.

Galaxies with no are impossible to understand in the framework of the current theory of galaxy formation, because the role of dark matter is fundamental in causing the collapse of the gas to form stars. In 2018, a study published in Nature announced the discovery of a galaxy that apparently lacked dark matter.

Now, according to an article published in the Monthly Notices of the Royal Astronomical Society (MNRAS) a group of researchers at the Instituto de Astrofísica de Canarias (IAC) has solved this mystery via a very complete set of observations of KKS2000]04 (NGC1052-DF2).

The researchers, perplexed because all the parameters that depended on the of the galaxy were anomalous, revised the available distance indicators. Using five independent methods to estimate the distance of the object, they found that all of them coincided in one conclusion: The galaxy is much nearer than the value presented in the previous research.

The original article published in Nature stated that the galaxy is at a distance of some 64 million light years from the Earth. However, this new research has revealed that the real distance is much less, around 42 million .

Thanks to these new results, the parameters of the galaxy inferred from its distance have become "normal," and fit the observed trends traced by with similar characteristics.

The most relevant datum found via the new distance analysis is that the total mass of this galaxy is around one-half of the mass estimated previously, but the mass of its stars is only about one-quarter of the previously estimated mass. This implies that a significant part of the total must be made up of dark . The results of this work show the fundamental importance of the correct measurement of extragalactic distances. It has always been one of the most challenging tasks in astrophysics—how to measure the distances to objects that are very far away.


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More information: Ignacio Trujillo et al. A distance of 13 Mpc resolves the claimed anomalies of the galaxy lacking dark matter, Monthly Notices of the Royal Astronomical Society (2019). DOI: 10.1093/mnras/stz771
Citation: Researchers solve mystery of the galaxy with no dark matter (2019, June 3) retrieved 24 June 2019 from https://phys.org/news/2019-06-mystery-galaxy-dark.html
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Jun 03, 2019
This is a 'quietly' extraordinary finding: it has, at least possibly, falsified the falsification of MOND-type alternatives to DM for the anomalous Keplerian orbital dynamics of visible galactic matter. Given the remarks I've confidently made in the past year, some backpedalling is in order.

Jun 03, 2019
We've been wrong about dark matter before, but it turned out we were wrong about being wrong.

Jun 03, 2019
yes, it is important sign of maturity to be able to confront one's own mistakes & learn to try better.

On a suspicion, I checked back five or six years ago in this site's archives. I was not surprised to find the same woomongering pseudonyms consistently carbon-copying the exact same errors they parrot in their posted comments today.

New data, advancing methods of analysis. corrected assumptions, improving quality of correlating evidence...

All these methodical advances denied & disparaged by the looneyticks.
Who stubbornly, desperately hang on to their fraudulent cult beliefs.

I'll give you odds that these pathetic trolls will be parroting the same gibberish they do today. Five years, ten years from now.

I know I should have checked further back into the archives,
But frankly & ernestly, what I did was as much bogus fraud as I can stand from the vermin.

Let the Social Science & Mental Health students monitoring thus site, have the joy of exposing the scale of stupidity.

Jun 03, 2019
yes, it is important sign of maturity to be able to confront one's own mistakes & learn to try better.
On a suspicion, I checked back five or six years ago in this site's archives. I was not surprised to find the same woomongering pseudonyms
I assume that 'wills', like 'Dan', does in fact constitute a kernel of the poster's real name, and is not pseudonymous.

Jun 03, 2019
This is a 'quietly' extraordinary finding: it has, at least possibly, falsified the falsification of MOND-type alternatives to DM for the anomalous Keplerian orbital dynamics of visible galactic matter. ...some backpedalling is in order.
Now, that 'some' said, although the crown-jewel of MOND-falsification appears ( a p p e a r s ) to have been rather unceremoniously pried from its setting, it leaves MOND at best in its accustomed spot in the evidentiary hot-seat. Wikipedia has a good summary of the temperature: wikipedia·org/wiki/Modified_Newtonian_dynamics#Outstanding_problems_for_MOND

Jun 03, 2019
There is no such thing as dark matter so there is no mystery.

Dark matter is just more snake oil some fake scientists are flogging, as they try to get a place at the trough...

The very notion of dark matter betrays the ignorance of its' promoters.

Jun 03, 2019
It is interesting to note that two papers concurrently clarify the early "red nuggets" galaxies [ https://phys.org/...ark.html ; https://arxiv.org...2938.pdf ] and the seeming "dark matter free" galaxies [ https://phys.org/...ark.html ; https://arxiv.org...0141.pdf ] while ending up with the usual need for LCDM dark matter at ~ 80 % matter content in both cases.

The "red nugget" fossil show a very calm AGN feedback and equilibrated dynamics with the classic dark matter cusp fitting the gravity profile best. The low surface brightness galaxy threw the earlier suggested distance indicator off, but using 5 more robust indicators show a consistent distance for the galaxy, its globular clusters and their survival outside the galaxy and the rest of the Local Group galaxies; it too show a good fit to a classic dark matter profile.

Jun 03, 2019
although the crown-jewel of MOND-falsification appears ( a p p e a r s ) to have been rather unceremoniously pried from its setting, it leaves MOND at best in its accustomed spot in the evidentiary hot-seat.


Yes, the two concurrent papers have MOND as worse (larger errors, unnecessary ad hoc gravity mechanism in the first case) or no better (LCDM classic cusp best vs good enough). But the 'dark matter free' galaxies were not the crown jewel test in my opinion, that goes to the first neutron binary star merger (and hope to see many repeats with the improved LIGO/Virgo runs):

"New observations of extreme astrophysical systems have "brutally and pitilessly murdered" attempts to replace Einstein's general theory of relativity."

[ https://www.quant...0180430/ ]

MOND is dead. So while the classic galaxy observations when extended to dispersed galaxies were much media inflated, the action were elsewhere.

Jun 03, 2019
Yes, the two concurrent papers have MOND as worse (larger errors, unnecessary ad hoc gravity mechanism in the first case) or no better (LCDM classic cusp best vs good enough). But the 'dark matter free' galaxies were not the crown jewel test in my opinion
What made it particularly salient in my view was its simplicity. If there were hold-outs previously, it was because the evidence and reasoning wasn't accessible to the average-Joe. I used to peruse physics-forums years ago, and was struck by so many people who still cannot make sense of even special relativity and are still making 'but if you measure the ladder...' arguments, if you know what I mean. A galaxy that displays complete high-school Keplerian normalcy instantly falsifies any need for MOND, but leaves DM unscathed: maybe the stuff is inhomogenously distributed.
But now, apparently not.

Jun 03, 2019
In search of black holes and dark matter astrophysicists are relying on indirect observations. It would seem that the measurement of the event horizon of a black hole directly would be a direct evidence. However, by the nature of a horizon, any real measurement of the event horizon will be indirect. The Event Horizon Telescope will get picture of the silhouette of the Sgr A* which is due to optical effects of spacetime outside of the event horizon. The result will be determined by the simple quality of the resulting image that does not depend on the properties of the spacetime within the image. So, it will be also indirect and an existence of BH is a hypothesis.
https://www.acade...ilky_Way
https://www.acade...k_Energy

Jun 03, 2019
"Galaxies with no dark matter are impossible to understand in the framework of the current theory of galaxy formation, because the role of dark matter is fundamental in causing the collapse of the gas to form stars."
So, it is impossible to understand something without experimentally unproven hypothesis? A hypothesis from a few decades ago becomes a dogma of today.
How about an older hypothesis then: god keeps the further star in galaxies from flying out. And makes stars.

A good one, @fourinfinities.

Jun 03, 2019
How about an older hypothesis then: god keeps the further star in galaxies from flying out. And makes stars.
Another nutjob anti-science worshipper of the anti-jebus surfaces. Sorry, jebus isn't old enough to make galaxies.

On Earth.

Jun 03, 2019
Gravity is a mass - emergent phenomenon. DM is the helical expression of the gravity of spinning mass in a "forward" motion...

Jun 04, 2019
@Da Schneib, you need a new sarcasm sensor.

Jun 04, 2019
No, you need to stop denying science in your handle. Maybe get a new one.

Jun 04, 2019
well rod, if you insist. by your expressed methodology of denial? i guess we'll just have to accept that you do not exist.

that the irrational phenomena of the denier troll, identifying as rodkeh, is just a simple glitch on a circuit board at a Dark Web site.

Jun 06, 2019
Heres something related, somewhat compelling to some, which I dont see on this site yet...

"Scientists have detected radio waves emanating from the space between a pair of galaxy clusters—evidence of intergalactic magnetic fields and fast-moving particles in the space between these giant galactic assemblages."

"Scientists were previously aware of a filament around 10 million light-years long that links galaxy clusters Abell 0399 and 0401 and magnetic fields within the clusters, but they wondered whether this filament itself contained magnetic fields and relativistic particles (meaning particles accelerated to nearly the speed of light)."

"This is the first such detection of a magnetized filament... "From a theoretical point of view, it's really challenging to explain this radio emission," Federica Govoni"

-Now what does that remind me of hmmm?

Jun 06, 2019
"If the data doesn't support the theory, change the data..."
Einstein, or some other pseudoscientist

Jun 06, 2019
Now what does that remind me of hmmm?

Do I need to reiterate these "magnetized filaments" are electric currents? Nah, everybody knows already.

Jun 06, 2019
Now what does that remind me of hmmm?

Do I need to reiterate these "magnetized filaments" are electric currents? Nah, everybody knows already.

They are potential "conductors" of electricity, not actual the currents.

Jun 06, 2019
From the gizmodo article

"The researchers used the Low Frequency Array (LOFAR) telescope network, a sensitive system consisting of thousands of radio antennas across dozens of stations, mostly in the Netherlands, to hunt for low-frequency radio-wave emissions from between the galaxies. They interpret the signal as the presence of synchrotron radiation, or particles spiraling at nearly light speed due to the influence of a magnetic field.

"But here's the mystery—the feature that the scientists detected is tens of times longer than the distance that a relativistic electron can travel in its lifetime. How were they able to measure the relativistic electron's signature radio waves, then? The researchers suggest that an existing population of electrons has been accelerated by weak shockwaves occurring in the region, produced as the structure was being formed."

-Sound like they are actual conductors of electricity... no?

Jun 06, 2019
The original article published in Nature stated that the galaxy is at a distance of some 64 million light years from the Earth. However, this new research has revealed that the real distance is much less, around 42 million light years.

So close, yet so far, from the truth.

Jun 06, 2019
Now what does that remind me of hmmm?

Do I need to reiterate these "magnetized filaments" are electric currents? Nah, everybody knows already.

They are potential "conductors" of electricity, not actual the currents.

The filaments are in fact the actual electric currents, the helical "expression" being the charges rotating about experiencing the long range attraction, short range repulsion of the EM forces. Not a thing to do with gravity or faerie dust.


Jun 10, 2019
Lol, when will they learn that dark matter ought to be everywhere

Jun 10, 2019
Juz let the speed of light be the original wavelength over the measured Period and understand that any mixture containing opposite changes will be attracted to any other mixture. Why is this so hard to understand? No Logic?

Jun 11, 2019
Juz let the speed of light be the original wavelength over the measured Period and understand that any mixture containing opposite changes will be attracted to any other mixture. Why is this so hard to understand? No Logic?
Hey v = n lamda, your language is confusing and what are you on about opp charges and all? Clarify please

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