CORNELL ASTRO 290 - Galaxies (14 pages)

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Galaxies



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Galaxies

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Pages:
14
School:
Cornell University
Course:
Astro 290 - Relativity & Astrophysics

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Galaxies Galaxies Relativity and Astrophysics Lecture 16 Terry Herter Outline Discovering Galaxies Classifying Galaxies Note A2290 16 A2290 16 Hubble morphological classification Different types of galaxies Most galaxy photos from Astronomy Picture of the Day APOD on the web you can find them and credits for images by searching the name of the object Galaxies 2 1 Galaxies Galaxies A galaxy is a collection of stars gas and dust along w associated starlight magnetic fields and cosmic rays Four broad categories based on morphology appearance E S S0 I elliptical spiral normal barred lenticular irregular A2290 16 Galaxies 3 Ellipticals Galaxies Range from spherical to highly flattened with designations E0 to E7 Contain old stars Pop II Very little gas and dust 1 200 kpc in diameter Mostly found in clusters of galaxies Average spectral type K 106 to 1013 Msun NGC 4636 E0 S01 NGC 4278 E1 A2290 16 A2290 16 NGC 4406 E3 NGC 3377 E5 6 Galaxies NGC 3115 E7 S01 4 2 Galaxies M87 Giant Elliptical Galaxy Spiral Galaxies A2290 16 A2290 16 Flattened systems which have a thin disk Display spiral structure Divided into barred SB and unbarred S spirals Further subdivided into classes a b and c e g SBb Sc where a large nuclear bulge tightly wound spiral arms c small nuclear bulge loosely M33 Sc wound spiral arms Young Pop I and old Pop II stars Copious amounts of gas and dust 5 50 kpc in diameter Found mostly in the field outside clusters of galaxies Average spectral type A F G K 109 to 1011 Msun Galaxies 6 3 Galaxies Spiral Galaxy Images Sc Whirlpool M51 SABc Southern Pinwheel M83 Sa M65 SBc M109 Lenticulars S0 Galaxies Like spiral galaxies in shape and color but no spiral arms Flattened systems which are morphologically between ellipticals and spirals M85 NGC 5866 A2290 16 A2290 16 Galaxies 8 4 Galaxies Irregulars By definition irregular in shape Mostly young stars Pop I Lots of gas and dust 1 10 kpc in diameter Found in the field outside clusters Average spectral type A F 108 to 1010



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