Spiral galaxies like the Milky Way and Andromeda Edge on and face on
L of Milky Way ~ few x 10 10 Lsun SDSS image by D. Hogg The Sombrero galaxy 12 kpc 40,000 light years
Cartoon of the edge‐on Milky Way galaxy Palomar 5 M5
M13 M15
Images of globular clusters (GCs) (Sloan Digital Sky Survey) Leo I Dwarf Galaxy A galaxy that has 1/10 or fewer the number of stars in a Milky Way sized galaxy Dwarf galaxies
Halo of dark ma er 250 kpc 800,000 LY
Large Magellanic cloud Wei‐Hao Wan, UH image credit (Giant) ellip cal galaxies
This type of galaxy is o en found at the centers of galaxy clusters
Ellip cal galaxies have rela vely less gas, dust, and star forma on than spiral galaxies.
They look redder because the ages of their stars are on average older than the stars in a spiral galaxy It is believed that a 2 billion solar mass black hole lives at the center of M87. Electrons accelera ng along the strong magne c field near the black hole produce this jet of light and charged par cles. Irregular galaxies forming lots of stars and/or interac ng with other galaxies
Large Magellanic Cloud – luminosity ~ 1/10 luminosity of the Milky Way The Mice Galaxies Many galaxies live in clusters or groups
Hickson Group 87 Image taken at Gemini South Abell Cluster S0740 Image was obtained with the Hubble Space Telescope Map of the Local Group Of Galaxies A dozens of dwarf galaxies and 2 giant spirals (the Milky Way and Andromeda) NGC 205 image credit: www.noao.edu ~ 1/40 Milky Way luminosity Image credit: David W. Hogg, Michael R. Blanton, and the Sloan ~ 1/300 Milky Way Digital Sky Survey Collabora on luminosity Image credit: David W. Hogg, Michael R. Blanton, and the Sloan ~ 1/2700 Milky Way Digital Sky Survey Collabora on luminosity