Recent content by Ruf30

Hello everyone at PF, Long time since I've logged on but always reading... I'm looking for a solid (as broad as possible, not too much depth) introductory book on plasma physics, just to get a broad view of the subject. Also, are there any textbooks which deal with the subject, from the...

Thank you George and stevebd1, It is true that these expressions are only valid for an observer at infinity. You are right George, neither is what I'm truly interested in. As you know from my previous thread, I'm imaging accretion discs (and tori) around Kerr black holes. It's easier if I...

Thanks stevebd1, I take it that \alpha \equiv (1+z)^{-1}, where z is redshift?

Any help, please?

I have a hopefully straightforward question. It is well known that in the Schwarzschild metric the gravitational redshift is given by 1+z=(1-r_{s}/r)^{-1/2}. Clearly this is just the ratio of observed to emitted frequencies (or energies). I understand this so far. However, for the case of the...

Thanks ExactlySolved, I think I've got it. Well, re: the redshift, I know hue varies between 0 and 1 and I'm playing with it right now. I want my negative redshifts to be coloured shades of green to blue and my positive redshifts shades of yellow-orange-red for increasing z. I've been playing...

I don't mind if anybody could tell me how to do this in IDL instead of Mathemtica say? I can use IDL on my university computers also. Anybody, please?

I'm looking, as an observer, at imaging accretion discs and tori around Kerr black holes. The image of the disc/torus is projected onto a 2D grid (a CCD if you like) so all lensing effects etc. are implicit. Basically, I can plot the image after determining the (x,y) coordinates in the 2D grid...