Fabian 51413 84 kpc uw astr 323 sp13 eric agol 2013

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Unformatted text preview: € measure the intensity & temperature at every loca8on in cluster 5/14/13 UW, ASTR 323, SP13, Eric Agol ©2013 9 X- ray Temperature & Density T=8 keV =10_ K; LX=5x1037W; R ≈ 3 Mpc; Mgas ≈2x1014 M¤༊ 5/14/13 UW, ASTR 323, SP13, Eric Agol ©2013 10 X- ray Temperature & Density Watanabe et al. (1999) •  Deprojec8on: we see a 2- D image, but need ___ distribu8on – since density declines, X- ray intensity is dominated by gas at _______ point •  Coma cluster: nearly uniform temperature, nearly circular shape Color: temperature in keV (1keV ≈ 107 K); Contours: X- ray intensity from 0.5- 10 keV 5/14/13 UW, ASTR 323, SP13, Eric Agol ©2013 11 Total Mass of Coma •  Hydrosta8c equilibrium: kTr %∂ ln ρ ∂ lnT ( M=− + ' * GµmH & ∂ ln r ∂ ln r ) !! •  If T ≈108K≈ constant and isothermal: € •  So, 2kTr M= = GµmH !! ∂ ln ρ ≈ −2 !! !!∂ ln r € •  This is ~___ 8mes the mass in gas – evidence for ____ _______ 5/14/13 UW, ASTR 323, SP13, Eric Agol ©2013 12 Perseus cluster 5/14/13 84 kpc UW, ASTR...
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This document was uploaded on 04/05/2014.

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