PPT-Active Galaxies

Lesson Objectives To appreciate that some galaxies emit far more energy at some wavelengths that can be explained simply in terms of starlight To recall the types of active galaxies To show an understanding of the mechanism for producing large quantities of radiation from active galaxies. 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. :. Active Galactic Nuclei: powerful energy sources in . “nuclei” . (. central ~1 pc) . of some galaxies. Main types. : . Seyferts. , radio galaxies and quasars. Other variants we’ll skip.. Power source: accretion of matter onto a supermassive black . 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 . February 9, 2013. @ 11:00 am. T. he unusually bright centers found in some galaxies are called . a. ctive galactic nuclei.. s. tarbursts.. h. alos.. s. upermassive. black holes.. According to current understanding, what is a quasar?. Most of the power of galaxies come from the stars. Almost all nearby galaxies. Some galaxies have very bright sources right at the center. Can be as bright as a galaxy!. Or even much brighter. Called . The Hubble Tuning-Fork Diagram. This is the traditional scheme for classifying galaxies:. Elliptical Galaxies. Elliptical galaxies. have smooth, round distributions of stars. They resemble globular clusters, except they are much larger. They . Craig Sarazin. University of Virginia. M86. (. Randall et al. 2008). . Abell. 2052. (Blanton et . al. . 2011). Optical light dominated by bulge. Last star formation typically billions of years ago. These are called . active. . galaxies. .. . Active Galaxies and Quasars. By looking far away and back in time, astronomers have discovered:. The origin of active galaxy energy sources and outbursts were closely related to the formation and history of galaxies.. super-massive black hole . occupation fraction. Elena Gallo | University of Michigan. Brendan Miller. , Jenny Greene, Brandon Kelly, . Tommaso. . Treu. , Jong-. Hak. Woo & Vivienne . Baldassare. around Abell 370, . a galaxy cluster at z = 0.37. International SKA . Forum 2010 . Philip Lah. A New Golden Age for Radio Astronomy. Collaborators:. . Frank Briggs (ANU). . Michael Pracy . M87. Studying the Cosmos through..... . Observations. Theory. Experiment. Astro @ Purdue. Astro @ Purdue. 9 . research-active faculty members covering a wide range of topics. Group includes postdoctoral scholars, staff scientists and students. Priest Associate Professor of Physics. Galaxies. 9/4/18. Milky Way Galaxy Contents & Motions. 9/11/18. Milky Way Environment & the Local Group. 9/18/18. Other Galaxies & Clusters of Galaxies. 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. Laura . Magrini. INAF- . Osservatorio. . Astrofisico. di . Arcetri. In Our Galaxy. Open clusters (disc population): . Many (~2200 known clusters). . even more new candidates in the inner disc from infrared surveys .