1	Astr 5460 Fri., Mar. 7, 2003 Today: Reminders/Assignments Longair, Chapter 4, Clusters Next week: - Getting into Theory/GR (Ch. 5+) - Read Hogg paper(s) Unless noted, all figs and eqs from Longair.
2	Reminders/Preliminaries Astro-ph preprints on Friday: http://xxx.lanl.gov/ Register an account on MAST? Ex-gal TAC assignment Galaxy Spectra/Modeling Assignment Discuss last, after finishing Ch. 4
3	Ex-gal TAC Assignment Next Friday in place of our usual astro-ph preprint discussion. 12 proposals, everyone has two primary proposals to lead the discussion about, plus two secondary proposals. Everyone must read all proposals and note strengths and weaknesses, and assign a preliminary grade (1=best, 5=worst), in accordance with guidelines. I’ll chair the meeting and evaluate performance. I expect this will be a challenging but very educational experience.
4	Forms of Dark Matter??? We’re certain it is present. Some is baryonic. More is non-baryonic.
5	Baryonic Dark Matter Protons, Neutrons, electrons (include black holes here too). Text example of bricks (yes bricks!). Brown dwarfs and the like. BB nucleosynthesis constrains baryons to less than 0.036 h^-2 of closure density.
6	Baryonic Dark Matter Black holes constrained by lensing effects (or lack thereof). MACHOs (Alcock et al. 1993):
7	Baryonic Dark Matter MACHOs: http://www.owlnet.rice.edu/~spac250/coco/spac.html MACHOs are rather massive, around half a solar mass, and can contribute up to half of the dark halo mass. White dwarfs???
8	Non-Baryonic Dark Matter I’m no expert on this stuff (and in some sense NO ONE is). Particle physicists play in this area more than astronomers. Leading candidates include Axions. Cold, low mass, avoid strong CP violation. Neutrinos. Hot, low mass (getting better constrained), lots of them. SN helps. WIMPs. Gravitino, photino, etc. Mirror Matter. May use in my next novel.
9	Galaxy Spectra assignment The textbook is rather weak when it comes to observational properties like spectra – as budding young observers you need to know more. Find and download the galaxy spectra templates of Kinney et al. (1996) – and read the paper! Find and download the spectral synthesis population models of Bruzual and Charlot. “Fit” the elliptical template and one spiral galaxy. Show some plots indicating how broad-band colors change with redshift assuming no evolution (up to z=2). Write up your results like you would for publication with clarity, citations, etc.