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Quarlep
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I am curious about mass of a galaxy without dark matter and with dark matter.I searched but I couldn't found.I ll be happy If you help me.
Thanks
Thanks
Yes, that is exactly what I was talking about.Quarlep said:Without dark matter I mean without dark matter mass my fault I forget mass
How does that change the question?Quarlep said:Without dark matter I mean without dark matter mass my fault I forget mass
The rabbit ? WRONG ? Not very likelywabbit said:I think the ratio of dark matter to matter is about the same in a typical galaxy (DM halo included) as the overall ratio of 85:15 but I could very well be wrong.
wabbit said:I think the ratio of dark matter to matter is about the same in a typical galaxy
do you not understand that 85:15 IS 85/15 or are you making a joke?Quarlep said:Is that right isn't it 85/15
I TOLD you to stay away from those things !wabbit said:Don't joke about the poor rabbit :) he's still recovering from almost loosing his legs in a black hole
I was wondering about that, or something related rather - in galaxy collisions the matter tends to coalesce into a single galaxy after a while due I believe to some kind of friction - but with high enough collision velocity it seems that (some part of) the dark matter halos could just move through each other and continue on their way. If that does happen, not only would we be left with a DM poor merged galaxy, but also with stray haloes of dark matter zooming away without much matter left in them . Is that something that happens and if so do we see such stray halos (through lensing or other means)?Vanadium 50 said:There exist both DM-rich and DM-poor galaxies.
Actually, I think the dust interactions DO contribute an effect, it's just that stars/planets are so far apart that THEY don't hit each other.wabbit said:Thanks, I thought "some kind of friction" arising from matter-matter interaction (gas clouds maybe?) played a role in the merger process - but you re saying it's minor and essentially gravitational effects alone explain the process, did I get that right?
phinds said:do you not understand that 85:15 IS 85/15 or are you making a joke?
Which part of post #10 did you not understand?Quarlep said:I was watching House and there House said dark matter makes galaxies 6 times bigger mass.And I am curious about is that same for every galaxy ? Example a galaxy mass is m without dark matter.But with dark matter 6m.Is that true for all galaxies ? (85/15 near to 6 so I made a connection)
Vanadium 50 said:There exist both DM-rich and DM-poor galaxies.
Quarlep said:But this sound like stupid I guess
Vanadium 50 said:If you don't like what I said, provide a counterexample or counterargument, or at least ask a question. Don't just call it stupid. It's not just unhelpful. It's rude.
If you bothered to type "dark matter rich galaxies" in Google, you would have gotten 70,600 hits. If I were you, I'd do a bit more research before telling other people that they are wrong.
I read them and I found them interesting.But I want to ask something , this cases are extraordinary but this cannot be the hole story.I want to ask you in generally how DM affects mass of galaxy.Theres 100 billion galaxies generally what can we say ?Chronos said:Examples include: http://arxiv.org/abs/astro-ph/0308518, A Dearth of Dark Matter in Ordinary Elliptical Galaxies; and http://arxiv.org/abs/1410.8141, Forty-Seven Milky Way-Sized, Extremely Diffuse Galaxies in the Coma Cluster.
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There are many Theories which define the start of universe differently. 1 among them say that universe begin with the break down of black holes and would end when entire mass of universe is pulled back by black hole. Yet the reality is undiscovered :)Quarlep said:I am curious about mass of a galaxy without dark matter and with dark matter.I searched but I couldn't found.I ll be happy If you help me.
Thanks
The mass of a galaxy with dark matter is significantly higher than the mass of a galaxy without dark matter. Dark matter is estimated to make up about 85% of the total mass of a galaxy, while the remaining 15% is made up of visible matter such as stars, gas, and dust.
Scientists use a variety of methods to determine the mass of a galaxy, including measuring the orbital speeds of stars and gas, analyzing the gravitational lensing effect, and studying the rotation curves of galaxies.
No, dark matter cannot be directly observed because it does not interact with light. However, its presence can be inferred through its gravitational effects on visible matter.
Dark matter plays a crucial role in the formation and evolution of galaxies. Its gravitational pull allows galaxies to form and hold their shape, and it also affects the distribution of visible matter within a galaxy.
There are several theories that attempt to explain the nature of dark matter, including the WIMP (Weakly Interacting Massive Particles) theory and the MACHO (Massive Compact Halo Objects) theory. However, the exact nature of dark matter is still a mystery and continues to be a subject of ongoing research and debate in the scientific community.