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The Washington Post reports about research on a galaxy called Dragonfly 44 which is believed to contain about the same mass as the Milky Way but is only 1% as bright. The low ratio of luminosity to mass is characteristic of ultra diffuse galaxies (UDGs). The galaxy is believed to lie 101 megaparsecs (329 million light years) away. The researchers offer explanations for the dimness of UDGs:
[...] it may be that UDGs are "failed" galaxies that were prevented from building a normal stellar population, because of extreme feedback from supernovae and young stars (Agertz & Kravtsov 2015; Calura et al. 2015), gas stripping (Fujita 2004; Yozin & Bekki 2015), AGN feedback (Reines et al. 2013), or other effects.
"AGN" is short for active galactic nucleus — where matter falls into a supermassive black hole. The citation is to "Dwarf Galaxies with Optical Signatures of Active Massive Black Holes" (open, DOI: 10.1088/0004-637X/775/2/116) (DX).
Previously: Huge Population of "Ultra-Dark Galaxies" Discovered
(Score: 2) by wonkey_monkey on Friday August 26 2016, @06:37PM
(like needing a fudge factor to get an equasion to balance)
Hey, look, science would love to hear if you have an idea that better fits the observations.
systemd is Roko's Basilisk
(Score: 2) by frojack on Friday August 26 2016, @07:10PM
And science would like to hear from you if you have ANY independently verifiable evidence of Dark Matter that exists in in the real workd other than a theoritical mathimatical model.
No, you are mistaken. I've always had this sig.
(Score: 2) by aristarchus on Friday August 26 2016, @10:19PM
exists in in the real workd other than a theoritical mathimatical model.
Seems that whenever anyone challenges the froj, the quality of his typing/spelling seriously degrades. I suspect Dark Matter is responsible.
(Score: 2) by wonkey_monkey on Friday August 26 2016, @11:02PM
There is independently verifiable evidence that there is additional mass out there which can't be accounted for by normal matter. Is it proven? No. But no-one's come up with a better explanation yet, so it's reasonable to stick with it for now.
systemd is Roko's Basilisk