Check this out. Direct evidence for Dark Matter which rules out modified gravitation.
http://xxx.soton.ac.uk/ps/astro-ph/0608407
http://xxx.soton.ac.uk/pdf/astro-ph/0608407 is the pdf version
Cosmo
Dark Matter Found
Dark Matter Found
Last edited by cosmo_uk on Tue Aug 22, 2006 10:55 am, edited 1 time in total.
For those that want a more simplified view check out the BBC story or the Washington Post one
http://news.bbc.co.uk/1/hi/sci/tech/5272226.stm
http://www.washingtonpost.com/wp-dyn/co ... 01139.html
but the one cosmo linked too has some very pretty figures.
http://news.bbc.co.uk/1/hi/sci/tech/5272226.stm
http://www.washingtonpost.com/wp-dyn/co ... 01139.html
but the one cosmo linked too has some very pretty figures.
Er no,
the offset they see is a very significant distance on the sky, of the order of 6-7 arcseconds, the pointing error on observations such as these is usually lt 0.1 arcsecs. Plus if you look at figure 1 in the paper you can see that the green contours (the galaxies, or luminous matter) are more widely separated in than the gas blobs (red areas). There is no way that you can move one set of observations to line up with the other, if you move the green contours so that the large cluster now overlaps the bigger red blob, the smaller cluster is now much further from the second red blob.
the offset they see is a very significant distance on the sky, of the order of 6-7 arcseconds, the pointing error on observations such as these is usually lt 0.1 arcsecs. Plus if you look at figure 1 in the paper you can see that the green contours (the galaxies, or luminous matter) are more widely separated in than the gas blobs (red areas). There is no way that you can move one set of observations to line up with the other, if you move the green contours so that the large cluster now overlaps the bigger red blob, the smaller cluster is now much further from the second red blob.
- iamlucky13
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Minor correction...at least as far as I understand the press release I read...this doesn't rule out modified gravity, but the results of this observation can not be explained by modified gravity, or anything else currently on the table, making it extremely strong support that dark matter rather than modified gravity is responsible for the structure of the galaxies.
Anyway, is this even relevant...I haven't seen a picture of this so-called "dark matter" on APOD yet.![Wink :wink:](./images/smilies/icon_wink.gif)
Anyway, is this even relevant...I haven't seen a picture of this so-called "dark matter" on APOD yet.
![Wink :wink:](./images/smilies/icon_wink.gif)
"Any man whose errors take ten years to correct is quite a man." ~J. Robert Oppenheimer (speaking about Albert Einstein)
Little on here is really on topic fortunately, otherwise all we would be discussing is cloud formations and smoke trails of late. Sigh.
Anyway there are several APODS of DM including this nice one.
http://apod.nasa.gov/apod/ap030814.html
Anyway there are several APODS of DM including this nice one.
http://apod.nasa.gov/apod/ap030814.html