An image of the Sunyaev–Zel'dovich effect

“…Several millimetre and radio detections towards a dozen of clusters have recently been obtained using various techniques [8,9,13,29,42,25]. These results, which are compatible with the expected brightness decrement, constitute a direct evidence for the SZ effect and have profound cosmological importance:…”

Section: Introductionsupporting

confidence: 63%

Observations of the Sunyaev–Zel'dovich effect at high angular resolution towards the galaxy clusters A665, A2163 and CL0016+16

Désert

Benoı̂t²,

Gaertner

et al. 1998

New Astronomy

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“…More recently, the bolometric technique has been used, specially because of the interest in detecting the e ect near 190 GHz, where the kinematic e ect is more obvious (e.g., Holzapfel et al 1997b). Finally, the completion of the Ryle array and the use of the OVMMA and BIMA for Sunyaev-Zel'dovich e ect measurements has produced a series of sensitive maps of clusters (e.g., Jones et al 1993;Carlstrom et al 1996), where some evidence of the cluster structure is seen (e.g., for CL 0016+16; Carlstrom et al 1996;Sec. 8.3).…”

Section: Cluster Datamentioning

confidence: 99%

“…Jones et al (1993) used the Ryle interferometer at 15 GHz, with baselines from 18 to 108 m, to locate sources and to map the di use Sunyaev-Zel'dovich e ect. The images that they obtained are shown in Fig.…”

Section: { 5 5 {mentioning

confidence: 99%

The Sunyaev–Zel'dovich effect

1999

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The Sunyaev-Zel'dovich e ect causes a change in the apparent brightness of the Cosmic Microwave Background Radiation towards a cluster of galaxies or any other reservoir of hot plasma. Measurements of the e ect provide distinctly di erent information about cluster properties than X-ray imaging data, while combining X-ray and Sunyaev-Zel'dovich e ect data leads to new insights into the structures of cluster atmospheres. The e ect is redshift-independent, and so provides a unique probe of the structure of the Universe on the largest scales. The present review discusses the theory of the Sunyaev-Zel'dovich e ect and collects published results for many clusters, presents the overall conclusions that may bedrawn from the detections so far, and discusses the prospects for future research on the Sunyaev-Zel'dovich e ects.Subject headings: Sunyaev-Zel'dovich E ect; Clusters; Microwave Background Radiation Astrophysical ContextCompton scattering is one of the major physical processes that couples matter and radiation. Its importance is often stressed in highly relativistic environments where large energy transfers occur: for example, in the synchrotron self-Compton process that may beresponsible for much of the X-radiation from active galactic nuclei (e.g., Fabian et al. 1986). However, the Compton process also has observable consequences in low-energy environments, where small energy transfers occur. The Sunyaev-Zel'dovich e ect, which arises from the scattering of electrons in clusters of galaxies on the cosmic microwave 1 Also Smithsonian Institution Astrophysical Observatory, 60 Garden Street, Cambridge, MA 02138, USA { 2 { background radiation eld, is perhaps the most important astrophysical example. The e ect provides a cosmological probe, it has been used to measure the properties of gas in clusters of galaxies, and it has been discussed as a means of measuring the motions of clusters of galaxies and hence studying the evolution of structure in the Universe.The purpose of this review is to provide a comprehensive introduction to the SunyaevZel'dovich e ect. I aim to provide both a theoretical treatment that can befollowed by non-specialists, and an introduction to the observation of the e ect with a critical review of data in the literature. The latter is more di cult today than it would have been ve years ago because of the rapid increase in the number of papers on the Sunyaev-Zel'dovich e ect, and the improvement i n t h e quality o f t h e results that are being gained.

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“…Birkinshaw et al 1978Birkinshaw et al , 1984Jones et al 1993). It lies at redshift z = 0.171 (Kristian et al 1978).…”

Section: Clear Detectionsmentioning

confidence: 99%

Comparison of Sunyaev-Zel’dovich measurements fromPlanckand from the Arcminute Microkelvin Imager for 99 galaxy clusters

Perrott

Olamaie

Rumsey

et al. 2015

A&A

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We present observations and analysis of a sample of 123 galaxy clusters from the 2013 Planck catalogue of Sunyaev-Zel'dovich sources with the Arcminute Microkelvin Imager (AMI), a ground-based radio interferometer. AMI provides an independent measurement with higher angular resolution, 3 arcmin compared to the Planck beams of 5-10 arcmin. The AMI observations thus provide validation of the cluster detections, improved positional estimates, and a consistency check on the fitted size (θ s ) and flux (Y tot ) parameters in the generalised Navarro, Frenk and White (GNFW) model. We detect 99 of the clusters. We use the AMI positional estimates to check the positional estimates and error-bars produced by the Planck algorithms PowellSnakes and MMF3. We find that Y tot values as measured by AMI are biased downwards with respect to the Planck constraints, especially for high Planck-S/N clusters. We perform simulations to show that this can be explained by deviation from the universal pressure profile shape used to model the clusters. We show that AMI data can constrain the α and β parameters describing the shape of the profile in the GNFW model for individual clusters provided careful attention is paid to the degeneracies between parameters, but one requires information on a wider range of angular scales than are present in AMI data alone to correctly constrain all parameters simultaneously.

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An image of the Sunyaev–Zel'dovich effect

Cited by 122 publications

References 8 publications

Observations of the Sunyaev–Zel'dovich effect at high angular resolution towards the galaxy clusters A665, A2163 and CL0016+16

Observations of the Sunyaev–Zel'dovich effect at high angular resolution towards the galaxy clusters A665, A2163 and CL0016+16

The Sunyaev–Zel'dovich effect

Comparison of Sunyaev-Zel’dovich measurements fromPlanckand from the Arcminute Microkelvin Imager for 99 galaxy clusters

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