PDA

View Full Version : galactic tidal distortion caused entirely by dark matter?



whwiii
2009-Aug-27, 06:43 AM
hiya
i may have misheard this
but i seem to remember a podcast mentioning a study wherein...

a model of a distorted galaxy implied that the tidal distortion was entirely due to dark matter.

is this correct?
can you point me to the article, layman's explanation of the topic, or the podcast where this was mentioned?

thanks
-bill w
astro.whwiii.net

robross
2009-Aug-29, 10:49 PM
hiya
i may have misheard this
but i seem to remember a podcast mentioning a study wherein...

a model of a distorted galaxy implied that the tidal distortion was entirely due to dark matter.

is this correct?
can you point me to the article, layman's explanation of the topic, or the podcast where this was mentioned?

thanks
-bill w
astro.whwiii.net

Perhaps you are thinking of the "Bullet" cluster? :

http://www.astronet.ru/db/xware/msg/1229241

Or maybe the effects of gravitational lensing?

http://en.wikipedia.org/wiki/File:Gravitationell-lins-4.jpg


There was a question show where they briefly mention it:

http://www.astronomycast.com/astronomy/questions-show-light-speed-andromeda-galaxy-dark-matter-and-black-holes/

And the wiki article on Dark Matter:

http://en.wikipedia.org/wiki/Dark_matter

Rob

whwiii
2009-Aug-29, 11:05 PM
Perhaps you are thinking of the "Bullet" cluster? :


thanks for the reply rob. my recollection is that pamela described a smaller scale interaction, something like the mice

http://apod.nasa.gov/apod/ap020506.html

but with only one visible galaxy. modeling implied that dark matter had caused the distortion. this was probably before episode 78 (that's the episode i'm up to)

-bill w

borman
2009-Sep-02, 05:21 AM
Preserved from distortion by dark matter?

Smooth, undisturbed dwarf spheroidal galaxies in the Perseus Cluster core: Implications for dark matter content
http://arxiv.org/abs/0908.3841