Dark halo nfw prole navarro frenk white 1997 apj 490

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Unformatted text preview: UW, ASTR 323, SP13, Eric Agol ©2013 8 Other Galac8c components: 2.  Globular clusters – halo, 158 of them ___ metal- poor [Fe/H] < - 1; spherically distributed ___ metal- rich [Fe/H] > - 1; disk- like distribu8on, concentrated in bulge Harris (1999) 4/4/13 UW, ASTR 323, SP13, Eric Agol ©2013 9 Other Galac8c components: 3.  Neutral gas, ionized gas, magne8c field and cosmic rays •  •  •  4/4/13 There are at least five phases of ISM: molecular (T≈10 K) & atomic clouds (100 K), warm atomic gas (8000 K), warm ionized gas (10,000 K), hot ionized gas (106K) (Bland- Hawthorn & Reynolds 2000) Nearly all in pressure equilibrium: P ~ 2×103 kB Complicated dynamics: supernova explosions/winds, gas cooling/collapse in spiral arms, magne8c field growth by shear, accelera8on of cosmic rays UW, ASTR 323, SP13, Eric Agol ©2013 10 Other Galac8c components: 4.  Dark halo - NFW profile (Navarro, Frenk & White, 1997, ApJ, 490, 493): a −2 ρ = ρ 0 (1 + r / a) r •  •  •  •  4/4/13 This profile results from simula8ons of gravita8onal collapse of cold dark mager (ignores gas/stars, which can change...
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This document was uploaded on 04/05/2014.

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