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Extreme_Galaxies

Extreme_Galaxies - 26 Extreme Galaxies Star Bursts to...

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Unformatted text preview: 26 - Extreme Galaxies: Star Bursts to Quasars Arthur Eddington 2 Extreme Galaxies • What makes a galaxy extreme? • What types are extreme? – Active Galactic Nuclei driven – Star Burst driven – Combination • Their distribution? – In space – In time 3 Luminosity Functions • Schechter Function- common for galaxies ( 29 * * * * exp L dL L L L L L d - Φ = α φ Log (Luminosity) Log( φ (L)) φ * L * Exponential Cut-off Power-Law slope α 4 Luminosity function dissected by galaxy type 5 The Luminosity Function and what does it tell us? • Most galaxies are “faint”, they have low luminosity (the “M” stars of the Universe) • At high luminosity there are relatively few galaxies; they are rare. (the “O” stars) • The high luminosity galaxies come in many flavors, types and names: – QSO or Quasars – AGN, Active Galactic Nuclei – Seyfert galaxies, type 1 and 2 – Star Burst galaxies – ULIRGs Ultra Luminous IR Galaxies – etc. 6 The Good News • There are only two ways to generate enormous energy: – Star formation and evolution – Black Holes accreting matter • The high luminosity galaxies generally use both mechanisms to varying extents SB ULIRGs AGN QUASARS Stars Black Holes Strong Force Gravity • There are only two ways to generate enormous energy: – Star formation and evolution – Black Holes accreting matter • The high luminosity galaxies generally use both mechanisms to varying extents SB ULIRGs AGN QUASARS Stars Black Holes Strong Force Gravity 7 Starburst galaxies • Stars are forming at a rapid pace up to 1000M Sun /yr. The Milky Way is forming stars at the rate of about 1M Sun...
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Extreme_Galaxies - 26 Extreme Galaxies Star Bursts to...

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