New Discovery - Blue Fuzzy Galaxies

[sadishappy]

I heard this on a podcast recently...new discovery.

Has anyone who is able to follow this more closely than me find any other news on it?
I find it quite fascinating, partly due to the fact that these galaxies are so numerious and changes the way we see the universe. Do you think these could be causes for dark matter?

Here is the story

Thanks. This is my most favorite forum ever.

[slang]

Has anyone who is able to follow this more closely than me find any other news on it?

I think I read something about these a while ago, but IIRC they were referred to by a different name. I can't remember which. You could try searching the Universe Today Stories subforum for "blue galaxies".

I find it quite fascinating, partly due to the fact that these galaxies are so numerious and changes the way we see the universe.

I'm not sure what you mean here. To me they don't seem very numerous at all, and I don't think it changes the way we see the universe much. But we might be meaning the exact same thing, they're subjective terms.

Do you think these could be causes for dark matter?

No, I don't think so. We can see them, so they're not Dark (as in, not interacting with electromagnetic radiation). Also, there would have to be incredibly many of them to account for the normal matter/Dark matter ratio, and if there were that many we would have seen them earlier.

[Ken G]

She certainly does paint them as a numerous and important new class of galaxies. It doesn't sound like they have nearly as high of a luminosity-to-mass ratio as starburst galaxies, so I'm not sure of their relative importance as blue galaxies go.

[sadishappy]

I was surprised to hear her say that they may out number the larger galaxies in the universe. Thus my dark matter question - although it certainly couldn't account for all of it.
However if they are as numerous as she claims could they be the cause of some dark matter? (Which, of course, these objects would no longer be considered dark matter but possibly decrease the percentage of dark matter out there?)

[TonyE]

If you search on "Faint Blue Galaxies" you will find lots of info. It seems they have been well known for some time. HST found lots of them see here.

The main debate seems to be - are they dwarf galaxies that are 'full' of young stars or are they big faint galaxies and we can see only a central region of star formation.

[RussT]

If you search on "Faint Blue Galaxies" you will find lots of info. It seems they have been well known for some time. HST found lots of them see here.

The main debate seems to be - are they dwarf galaxies that are 'full' of young stars or are they big faint galaxies and we can see only a central region of star formation.

http://www.narrabri.atnf.csiro.au/pu...mages/ngc2915/

[RussT]

Originally Posted by TonyE
If you search on "Faint Blue Galaxies" you will find lots of info. It seems they have been well known for some time. HST found lots of them see here.

The main debate seems to be - are they dwarf galaxies that are 'full' of young stars or are they big faint galaxies and we can see only a central region of star formation.

Link Posted by RussT

http://www.narrabri.atnf.csiro.au/pu...mages/ngc2915/

SO, it appears to be pretty obvious that most if not all BCD's (Blue Compact Dwarfs) are full galaxies and not dwarfs.

Therefore wouldn't it follow that these NGC 2915's turn into LSB's (Low Surface Bright) Galaxies, which make up about 80% of the Universes spiral galaxies. (Not including Dwarf Galaxies)

http://en.wikipedia.org/wiki/Low_sur...ghtness_galaxy

Wow........now wiki says 90% (I saw the 80% figure about 1 or 2 months ago)

And an additional question that MUST come to everyones mind...

When do the SMBH's become part of these BCD's and LSB's galaxies lives???

And...oh yeah...click on the link to 2915 again...look.....the Nuclear "Bar" hasn't even formed yet....I wonder what that could possibly mean???