Details

Autor(en) / Beteiligte

• Marrone, Daniel P.
• Culverhouse, Thomas
• Carlstrom, John E.
• Greer, Christopher
• Hennessy, Ryan
• Leitch, Erik M.
• Loh, Michael
• Pryke, Clem
• Smith, Graham P.
• Hamilton-Morris, Victoria
• Richard, Johan
• Joy, Marshall
• Bonamente, Massimiliano
• Hasler, Nicole
• Kneib, Jean-Paul
• Hawkins, David
• Lamb, James W.
• Muchovej, Stephen
• Miller, Amber
• Mroczkowski, Tony

Titel

LoCuSS: A COMPARISON OF SUNYAEV-ZEL'DOVICH EFFECT AND GRAVITATIONAL-LENSING MEASUREMENTS OF GALAXY CLUSTERS

Ist Teil von

• The Astrophysical journal, 2009-08, Vol.701 (2)

Ort / Verlag

United States

Erscheinungsjahr

2009

Quelle

EZB-FREE-00999 freely available EZB journals

Beschreibungen/Notizen

• We present the first measurement of the relationship between the Sunyaev-Zel'dovich effect (SZE) signal and the mass of galaxy clusters that uses gravitational lensing to measure cluster mass, based on 14 X-ray luminous clusters at z {approx_equal} 0.2 from the Local Cluster Substructure Survey. We measure the integrated Compton y-parameter, Y, and total projected mass of the clusters (M {sub GL}) within a projected clustercentric radius of 350 kpc, corresponding to mean overdensities of 4000-8000 relative to the critical density. We find self-similar scaling between M {sub GL} and Y, with a scatter in mass at fixed Y of 32%. This scatter exceeds that predicted from numerical cluster simulations, however, it is smaller than comparable measurements of the scatter in mass at fixed T{sub X} . We also find no evidence of segregation in Y between disturbed and undisturbed clusters, as had been seen with T{sub X} on the same physical scales. We compare our scaling relation to the Bonamente et al. relation based on mass measurements that assume hydrostatic equilibrium, finding no evidence for a hydrostatic mass bias in cluster cores (M {sub GL} = 0.98 {+-} 0.13 M {sub HSE}), consistent with both predictions from numerical simulations and lensing/X-ray-based measurements of mass-observable scaling relations at larger radii. Overall our results suggest that the SZE may be less sensitive than X-ray observations to the details of cluster physics in cluster cores.