View Full Version : Gravitational Lensing and Dark Matter

2004-Jun-17, 04:29 AM
Does anyone here know how to measure the amount of dark matter in a (star system, galaxy, etc) by using gravitational lensing? I understand the basic concept, but I would really like to see some methodology or something. In a few weeks I'm going to that Astronomy camp that you here discussed so often and this is a project I'd really like to do. I'm not sure what exactly needs to be measured and analyzed. Any help would be appreciated. :D

2004-Jun-17, 05:34 AM
Wow, there is a wealth of google material on this since the last time I looked!

Here's a good basic overview (http://www.bell-labs.com/org/physicalsciences/projects/darkmatter/darkmatter.html) in 4 short pages.

And here's the google search page (http://www.google.com/search?sourceid=navclient&ie=UTF-8&oe=UTF-8&q=gravitational+lensing+and+dark+matter) for dark matter and gravitational lensing.

2004-Jun-17, 09:56 PM
I think I've found a couple of papers online that will help me out. Thank you for the links!

Tobin Dax
2004-Jun-17, 11:45 PM
You may also want to try looking for "MACHO's," MAssive Compact Halo Objects, which is what the lensing technique looks for. You may want to note that such lensing experiments have shown that MACHO's are a very unlikely candidate for dark matter. That, at least, should give you an idea of what results to expect. :)