PPT-Watching Galaxies Form Near the Beginning of Time

The Cosmic Time Machine Astronomical telescopes cant help viewing the past Distance and time are always mixed in astronomical observations The finite speed of light means that we always see things after they have happeneda delay of 8 minutes for the Sun and about 12 billion years for the most distant galaxies we can observe In other words. The Milky Way Galaxy. When you look into the hazy band of light across the sky, you are actually looking at our galaxy from the inside. While an awesome sight, you can only truly begin to see it if you get away from city lights on a moonless night. . 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. Galaxy Morphology and Environment. Main relation – . E’s more common in clusters than field. f(E. ) = fraction of ellipticals . f(Sp. ) = fraction of spirals. regular, symmetric cluster – . f(E. Hubble’s Law: v = H. o. d. Velocity increases with distance. Expanding Universe. Hubble’s law .  Universe is expanding. Universe had a beginning !. How long ago?. Age of the universe: 1/H. Physicist and communicator at CERN. The dark side of the Universe. Shrimp Nebula. ©. VLT, European Space Observatory. Convince you all of the existence of dark matter. Review how one can catch dark matter. http://www.pa.uky.edu. Only 10% of the class has completed the evaluations so far.. I will add 5 points on your final exam if you complete the evaluation.. Today’s model for the formation of the Milky Way and other galaxies. Galaxy Morphology and Environment. Main relation – . E’s more common in clusters than field. f(E. ) = fraction of ellipticals . f(Sp. ) = fraction of spirals. regular, symmetric cluster – . f(E. . Loners. Interactions were once . believed to be unimportant . and rare.. Galaxies were thought to . be . isolated loners. , well . separated from one . another . a. nd scarcely interacting.. Au Contraire!. Physicist and communicator at CERN. The dark side of the Universe. Shrimp Nebula. ©. VLT, European Space Observatory. Convince you all of the existence of dark matter. Review how one can catch dark matter. the Reduced Shear, . the . Pixelation. Effect, . and the Photon Noise . Jun Zhang, . Eiichiro. Komatsu. (The University of Texas at Austin). Caltech, Sep 27, 2011. arXiv. : 1002.3614; 1002.3615; 0901.4781,. Let’s look back at the rotational velocity equation:. v = (M. interior. G/r). 0.5. The rotational velocity is constant at big r values.. What must we conclude?. The mass interior to the orbit is still increasing. Even after the radius r has gone beyond the last of the stars. It must be increasing in order to hold v constant.. 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?. Chapter 2. Stars. Section 1 Vocabulary. Spectrum. Apparent Magnitude. Absolute Magnitude. Light-Year. Parallax. Color of Stars. Red and Yellow. Cool. Blue . Warm. Blue flame hotter than yellow flame. B. e . E. xcellent . F. or . A. esthetic . M. ovement, . S. ometimes . C. reating . I. nterest!. Posture Strength Control Balance . . Extension. Flexibility Alignment Mobility. Stamina Coordination Is.