NATS 1740 Study Guide - Final Guide: Dwarf Elliptical Galaxy, Dwarf Spheroidal Galaxy, Active Galactic Nucleus

• School: York University
• Department: Natural Science
• Course: NATS 1740
• Professor: Radu Campeanu

Document Summary

Chapter 16 review: halo component: (of a galaxy) the portion of any galaxy that is spherical (or football- like) in shape and contains very little cool gas; it generally contains only very old stars. H0 is hubble"s constant: giant galaxies: galaxies that are unusually large, typically containing a trillion or more stars. Most giant galaxies are elliptical, and many contain multiple nuclei near their centers: galactic cannibalism: the term sometimes used to describe the process by which large galaxies merge with other galaxies in collisions. Irregular galaxies: galaxies that look neither spiral nor elliptical. Quasars are the brightest type of active galactic nuclei; radio galaxies also contain active galactic nuclei: radio lobes: the huge regions of radio emission found on either side of radio galaxies. The lobes apparently contain plasma ejected by powerful jets from the galactic center: lookback time: the amount of time since the light we see from a distant object was emitted.