1	Astr 5460 Fri., Feb. 7, 2003 Today: WIRO: Tonight! Reminders/Assignments Longair, Ch. 2 (Large Scale Struct.) Start Longair, Ch. 3 (Galaxies) Unless noted, all figs and eqs from Longair.
2	WIRO -- logistics We will leave after colloquium, about 5PM. Sabrina and I are driving. Bring food and drinks (only water will be available at WIRO). We can stop on the way if necessary, but better to get early. Dress WARMLY! Overkill is OK. May stay until morning if weather is good. Beds are available at WIRO.
3	WIRO – science+ Mike Pierce is putting on the Prime Focus camera (see webpage for more info). Jon Darnel has one project with Chip K. M33 blue imaging, 1-2 hours. Pretty 3-color pictures for a calendar – bring targets! Note that there is no internet connection right now. I’m working on developing a good project. Group Assignment: Take notes and develop a WIRO/PFC Observer’s Handbook.
4	Reminders/Preliminaries Astro-ph preprints: http://xxx.lanl.gov/astro-ph Discuss homework assignments (briefly!) Redshifted BB curve MAP, PLANCK (Kiminki)
5	Hubble’s Law and Expansion
6	Hubble’s Law and Expansion
7	Hubble’s Law and Expansion
8	Hubble’s Law and Expansion
9	Hubble’s Law and Expansion
10	Hubble’s Law and Expansion
11	Hubble’s Law and Expansion
12	Hubble’s Law and Expansion
13	Conclusions On the largest scales it is appropriate to impose the conditions of isotropy and homogeneity, plus uniform expansion. These simplifications plus GR provide relatively simple “world models” that provide a framework for cosmology and the origin of galaxies and other large scale structures.
14	Chapter 3: Galaxies General, basic properties outlined here. More will be covered in ASTR 5440. Classifications Luminosity Functions Galaxy Masses Elliptical Galaxies Spiral Galaxies Correlations with Types
15	“Tuning Fork” Diagram
16	Spiral types The nuclear bulge is population II (old stars) So the Sa – Sc sequence is consistent with little gas Þ more gas
17	Elliptical Galaxy: M87
18	Irregular Galaxies: Magellanic Clouds
19	More on Classifications
20	Frequency of Galaxy Types
21	Frequency of Galaxy Types
22	Frequency of Galaxy Types
23	The Local Group of Galaxies Galaxies live in clusters Rich clusters: thousands of galaxies Poor clusters: Fewer than a thousand
24	The Coma Cluster
25	Interacting Galaxies: The Antennae
26	Interacting Galaxies: Cartwheel
27	Effects of Collisions Stars pass “through” each other, although orbits disrupted Gas clouds collide Gas stripped away from stars Collisions cause bursts of star formation Ellipticals may be galaxies which have suffered collisions Spirals may be galaxies which have not suffered collisions Joshua Barnes (Hawaii) and the Space Telescope Science Institude provide a simulation of the Antenna Galaxies: http://imgsrc.stsci.edu/op/pubinfo/pr/1997/34/images/anima.mov
28	Simulation of the Cartwheel Encounter From the Space Telescope Science Institute which also provided the Cartwheel image in the textbook: http://imgsrc.hubblesite.org/hu/discoveries/striking_encounters/graphics/cartwheel.mpg
29	Luminosity Functions For Wednesday…