PPT-Hubble Diagram: Distribution of Galaxies

Hubbles Law v H o d Velocity increases with distance Expanding Universe Hubbles law Universe is expanding Universe had a beginning How long ago Age of the universe 1H. Lecture 3; April . 11 2013. Previously.. On Astro-2. The universe is much larger than the Milky Way (Gpc vs kpc). There are billion of galaxies, the Milky Way is average Joe galaxy. Most galaxies can be classified based on their appearance as . Galaxies . And the Foundation of Modern Cosmology. How are the lives of galaxies connected with the history of the universe?. Hubble Deep Field. Our deepest images of the universe show a great variety of galaxies, some of them billions of light-years away. Introduction. Trigonometric Parallax . Spectroscopic Parallax . Cepheid Variables . Type Ia Supernovae. Tully-Fisher Relationship. Hubble’s ‘Law’ . Trigonometric Parallax. While fundamental, this method is very limited in terms of how far away one can use it. For large numbers of star, ground-based measurements of parallax do not get beyond about 20 pc, although on individual objects this can be extended to about 100 pc (with much effort). . http://www.pa.uky.edu. I will add 5 points on your final exam if you complete the evaluation.. Edwin Hubble’s next project.. Having established in 1925 that galaxies were not in the Milky Way, Hubble used the Mt Wilson telescope to obtain spectra of galaxies.. 23. vs. .. 1. First spiral nebula found in 1845 by the Earl of . Rosse. . Speculated it was beyond our Galaxy.. 1920 - "Great Debate" between Shapley and Curtis on whether spiral nebulae were galaxies beyond our own. Settled in 1924 when Edwin . Michael Fall. STScI. . CoolSci. Talk. . Specific Angular Momentum . vs. Mass. Fall 1983. . j. = J/M . α. . M. α. with . α. ≈ . 2/3. S and E galaxies offset by ~6x. Extragalactic Distance Scale. Cepheids. M. V. =-3.35logΠ-2.13+2.13(B-V) . Π. =period (days). Novae M. V. (max)=-9.96-2.31log(. Δm. /day). first 2 . mags. Planetary Nebulae Luminosity Function M. Universe. Imagine that you find a star with an unknown distance, but you notice that it has a distinctive characteristic that tells you that it is a specific type of star. And let’s imagine that all stars of that type have the same luminosity, and you happen to know the value of that luminosity. You can then estimate the distance for the star you found from the inverse square law of light:. #2 . Grades are posted on course website. Average = . 126/180, . s.d. . = . 27 (Section 1). 124/180, . s.d. . = 27 (Section 2). Highest . 174/. 180. Scores below 100 => “serious concerns”. Harrison B. Prosper. Florida State University. YSP. Island Universes. The Expanding Universe. The Universal Scale Factor. Models of the Universe. Summary. Topics. Henrietta Leavitt. 1912. Luminosity-Period Relation of Cepheid Variables. Islands of Stars. Our goals for learning. :. How are the lives of galaxies connected with the history of the universe?. What are the three major types of galaxies?. How are galaxies grouped together?. .. 1. First spiral nebula found in 1845 by the Earl of . Rosse. . Speculated it was beyond our Galaxy.. 1920 - "Great Debate" between Shapley and Curtis on whether spiral nebulae were galaxies beyond our own. Settled in 1924 when Edwin . The Hubble Deep Field. 10 day exposure –field located in the Big Dipper. Edwin Hubble. Edwin . Hubble. Hubble’s Galaxy Classification . Spiral Galaxies. galaxies like the Milky Way with arcing structures lying in a plane and emanating from the nuclear bulge. Professor Mike Brotherton. Dobson Chapter 19, . Ryden. and Peterson Chapter 20. Galaxies. “My God, they’re full of stars!” (But more dark matter.). Galaxies. Hubble type & characteristics of different types of nearby galaxies; introduction to galaxy clusters.