| 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. | |
| 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 | ||
| 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. |
| We’re certain it is present. | ||
| Some is baryonic. | ||
| More is non-baryonic. | ||
| 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. | ||
| Black holes constrained by lensing effects (or lack thereof). | ||
| MACHOs (Alcock et al. 1993): | ||
| 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??? | ||
| 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. | ||
| 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. |