16 2013 may 1 p13 eric agol cosmological redshio

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Unformatted text preview: tween redshiO and distance; _____ at small distances: cz = H0d •  Complex func8on at larger distances (more later) •  NOT A MEASUREMENT OF _________! •  There is scaVer due to _______ mo8ons of galaxies resul8ng in a Doppler shiO on top of the cosmological redshiO (zDoppler can be nega8ve): 1+ztot=(1+zcosmological)(1+zDoppler) •  RedshiO can be measured accurately; distances are ______ to measure 4/23/2013 UW, ASTR 323, SP13, Eric Agol ©2013 13 (Mpc) Hubble Diagram H0 = 72 ± 8 !km!s)1 !Mpc)1 !! Freedman et al. (2003) Riess et al. (2009): H0 = 74.2 ± 3.6 !km!s,1 !Mpc,1 !! € 4/23/2013 UW, ASTR 323, SP13, Eric Agol ©2013 14 The “Cosmological Principle” The universe looks about the ____ no ma3er where you are within it •  MaVer is evenly distributed on very _____ scales in the universe •  No ______ & no ______ •  Consistent with all observa8ons to date 4/23/2013 UW, ASTR 323, SP13, Eric Agol ©2013 15 Origin of cosmological redshiO •  As photons travel their wavelengths are _________ •  Photons from twice as far away have traveled ______ as long so they’re stretched ______ as much - this results in the H...
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This document was uploaded on 04/05/2014.

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