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26 April 2024 |
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Sunyaev-Zel'dovich Effect Observations of the Bullet Cluster (1E 0657-56) with APEX-SZ | | N. W. Halverson
; T. Lanting
; P. A. R. Ade
; K. Basu
; A. N. Bender
; B. A. Benson
; F. Bertoldi
; H.-M. Cho
; G. Chon
; J. Clarke
; M. Dobbs
; D. Ferrusca
; R. Guesten
; W. L. Holzapfel
; A. Kovacs
; J. Kennedy
; Z. Kermish
; R. Kneissl
; A. T. Lee
; M. Lueker
; J. Mehl
; K. M. Menten
; D. Muders
; M. Nord
; F. Pacaud
; T. Plagge
; C. Reichardt
; P. L. Richards
; R. Schaaf
; P. Schilke
; F. Schuller
; D. Schwan
; H. Spieler
; C. Tucker
; A. Weiss
; O. Zahn
; | | Date: |
26 Jul 2008 | | Abstract: | We present observations of the Sunyaev-Zel’dovich effect (SZE) in the Bullet
cluster (1E 0657-56) using the APEX-SZ instrument at 150 GHz with a resolution
of 1 arcmin. The main results are maps of the SZE in this massive, merging
galaxy cluster. The cluster is detected with 23 sigma significance within the
central 1 arcmin radius of the source position. The SZE map has a broadly
similar morphology to that in existing X-ray maps of this system, and we find
no evidence for significant contamination of the SZE emission by radio or IR
sources. In order to make simple quantitative comparisons with cluster gas
models derived from X-ray observations, we fit our data to an isothermal
elliptical beta model, despite the inadequacy of such a model for this complex
merging system. With an X-ray derived prior on the power-law index, beta = 1.04
+0.16/-0.10, we find a core radius r_c =144 +/- 19 arcsec, an axial ratio of
0.881 +/- 0.086, and a central temperature decrement of -880 +/- 80
micro-K_CMB, including a +/- 6% flux calibration uncertainty. These model
parameters are consistent with the values determined from X-ray data. Under the
assumption of an isothermal cluster gas distribution in hydrostatic
equilibrium, we compute the gas mass fraction for prolate and oblate spheroidal
geometries, and the mass-weighted electron temperature of the cluster. This
work is the first result from the APEX-SZ experiment, and represents the first
published scientific result from observations with a large array of multiplexed
superconducting transition-edge sensor bolometers. | | Source: | arXiv, 0807.4208 | | Services: | Forum | Review | PDF | Favorites | |
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