The Effect of Sloshing Gas on Hydrostatic Mass Profiles€¦ · The Effect of Sloshing Gas on...
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The Effect of Sloshing Gas on Hydrostatic Mass Profiles
SNOWCLUSTER Workshopby Ryan E. Johnson
CfA, Dartmouth College
with
Christine Jones, Maxim Markevitch, Bill Forman, John Zuhone & Gary Wegner
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Outline
Hydrostatic Mass Estimates Sloshing (observations & simulations) Analysis of Simulated Sloshing
− HE mass profiles Conclusions
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Hydrostatic Equilibrium
− Radial derivatives of T and problems with discontinuities and flat profiles
− Non-thermal pressure support
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Hydrostatic Mass Estimates
RXJ1720.1+2638 (Mazzotta et al. 2001) Abell 1795 (Markevitch et al. 2001)
− Keshet et al. (2010)
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Gas Sloshing
Sloshing occurs when a cluster is gravitationally perturbed
Hydro simulations (R=20, b=1 Mpc, with gas)
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Gas Sloshing
Sloshing occurs when a cluster is gravitationally perturbed
Hydro simulations (R=20, b=1 Mpc, with gas)
Zuhone et al. (2010)
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Sloshing Type Cold Fronts Characteristics
− Contact discontinuities: T and are discontinuous, P is continuous
− Appear as spiral shape (Lagana et al. 2010) or concentric edges in Sx
− Simulations show weak interactions may induce sloshing (Ascasibar & Markevitch, 2006)
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Simulations
Ascasibar & Markevitch (2006)
− GADGET 2 SPH code
− T=10 keV, MT=1.7e15 M⊙,
Hernquist DM profile− R=5, b=500 kpc− 10 kpc resolution
Projected temperature and density images
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Simulations
Ascasibar & Markevitch (2006)
− GADGET 2 SPH code
− T=10 keV, MT=1.7e15 M⊙,
Hernquist DM profile− R=5, b=500 kpc− 10 kpc resolution
Projected temperature and density images
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Fitting Simulations
Fitting with flexible analytic functions− Vikhlinin et al. (2006, V06)
Parameters were varied, the minimization was done to match projected functions to the images
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Fitting Simulations
Sanity Check
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Fitting Simulations
Fitting azimuthally averaged with V06
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Fitting Across Sx Edges
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Fitting Simulations
Fitting azimuthally averaged with V06
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Fitting Across Sx Edges
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Fitting Simulations
Fitting azimuthally averaged with V06
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Fitting Across Sx Edges
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Perfect Data - Perfect Functions
Differentiating the true azimuthally averaged T and
HE underestimates the true mass by 10-20% measured at outer edge and differs by 20-40% at the inner sloshing edge
Outer sloshing edge
Inner sloshing edge
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Summary
Majority of our HE mass errors come from systematic effects:
− sparse sampling/inability to fit data
− choice of centers
Azimuthally averaging can compensate for some edges
Intrinsic deviation from HE mass estimates due to sloshing is relatively small and primarily at cold fronts
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Thanks