A35 Chapter 24 - MAIN IDEAS FROM CHAPTER 24 Hubble Classification spirals barred spirals ellipticals and irregulars the disks of spiral and barred

A35 Chapter 24 - MAIN IDEAS FROM CHAPTER 24 Hubble...

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MAIN IDEAS FROM CHAPTER 24: Hubble Classification * spirals, barred spirals, ellipticals, and irregulars * the disks of spiral and barred spirals are the sites of active star formation * elliptical galaxies have very little interstellar dust, so star formation is rare * lenticular galaxies – the intermediates between spiral and elliptical galaxies * irregular galaxies have asymmetric shapes and are often found associated with other galaxies * Distance to Galaxies * objects such as Cepheid variables (yellow pulsating supergiant) and other luminous supergiants, globular clusters, H II regions, and supernovae are used to estimate intergalactic distances * Tully-Fisher relation between the width of 21-cm line of hydrogen in a spiral galaxy and its luminosity can also be used to determine distance. A method for elliptical galaxies is the fundamental plane, which relates the galaxy's size to its surface brightness distribution and to the motions of the stars.
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  • Spring '09
  • RobertKirshner
  • Galaxies, elliptical galaxies, Irregular galaxies, lenticular galaxies

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