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The_Great_Mighty_Poo t1_irsus3v wrote

So would all of this graveyard material be considered at least a partial candidate of dark matter? It seems to be found in halos around the Galaxy, it would be made up of dead stars and other matter that might not be very visible, and examples like the bullet cluster that seemed to be devoid of dark matter may have just had a run in with a local Galaxy that stripped it away or kicked it out. Or would this amount of material be orders of magnitude too small to explain a reasonable proportion of expected dark matter?

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SnowyNW t1_irt1zii wrote

This material is both already accounted for and just too small a quantity. I’m no expert though.

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Bensemus t1_irzsr27 wrote

Any matter we can see with light isn’t a candidate for Dark Matter. It also has to outnumber all the visible matter 5:1.

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wolfpack_charlie t1_is61xlp wrote

Not an astronomer, but I would guess probably not, since we need several times as much dark matter as ordinary matter. Also, judging from the picture, it looks like the graveyard mass is still concentrated in the center, not in a ring surrounding the galaxy.

It's also important to remember that galaxy rotation is just one of several phenomenon that dark matter explains. These stellar graveyards inside galaxies wouldn't explain the dynamics of galaxy clusters or the CMB

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superaub t1_irt27my wrote

Yep, they would. Pretty sure these would qualify as MACHOS. Probably still not enough matter but can't know until we measure it.

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