PDF-The mass distribution in spiral galaxies

IrinaYegorovaSISSA Trieste Italy In collaboration with Paolo Salucci Alessandro Pizzella NivDrory Outline149The disk mass of spiral galaxies149Radial TullyFisher relation RTF149Satell. Except for nearby, we can only see bright galaxies. I will ignore dwarf . spheroidal. (. dSph. ) and dwarf elliptical (. dE. ) classifications. Galaxies . come in four broad categories, based on their appearance. Go to the Physics and Astronomy Department website.. www.pa.uky.edu. Click on “. Online Course Evaluation. ” link. Link is open now. Do it soon.. The nearest stars to the Sun.. Barnard’s Star. Li Jiang-Tao. 1. Service d’Astrophysique, CEA, Saclay, France. 2. . Department. of . Astronomy. , . University. of Michigan, Ann Arbor, USA. Outline. 1. Introduction. 2. Diffuse X-ray . observation. 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. 2. The Universe. Th. 3. The Universe is . everything. t. hat exists in space. 4. Galaxies. 5. Galaxies and Shapes (…Cont.). Spiral galaxies:. can be broken down in two categories. Circular spiral - round center. Ms. Cordaro . SMHS . Earth Science. Review/Warm up – Write this in your journal. (Do not fill in the blanks yet!!). A light year = How far _ _ _ _ _ travels in _ _ _ year.. The electromagnetic spectrum is made up of different size _ _ _ _ _ that produce _ _ _ _ _ _ in the form of radiation.. Spiral Structure. . The Astronomical Context. By the 1920’s, we knew that the once-mysterious spiral nebulae were flattened galaxies. . Our Milky . Way is . also. flattened. . Two obvious . questions arose:. megaparsecs. away be moving with respect to us, according to Hubble’s Law? Hint: H. 0. = 70 km/s/. Mpc. 1,400 km/s. 14,000 km/s. 140,000 km/s. 140 km/s. How fast would a galaxy 2,000 . megaparsecs. and Earth. Which phase of the Moon would. be seen by people on Earth?. Earth. Moon. Sun. New Moon. MYP Unit Question. : What’s out there?. Area of Interaction. : Human Ingenuity. Learner profile:. Galaxies (part I) . T. Howard. The Galaxy – part I -- Overview. New distance unit: the . parsec. (pc).. Using Earth-orbit parallax, if a star has a . parallactic. angle of 1",. it is 1 pc away. . Galaxies are . not. . alike. For every general rule I give, one can find exceptions. Classifying galaxies is difficult. They look different in different wavelengths. If the galaxy is moving, you have to correct for red-shift. Here’s the Story We’ll Unfold for You…. Hubble’s galaxy classifications: Spirals, . ellipticals. , irregulars. . Structural parts of galaxies: disk, halo, nucleus, bulge. Spiral arms – tracers of star formation. 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. The Universe. The big bang theory. Happened approximately 13.5 billion years ago. The Big Bang was caused by the density of the compressed galaxies. It was in a very high density state, then it expanded. After the beginning expansion, it cool to let subatomic particles and later on, simple atoms to form. .