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The Sunyaev–Zel'dovich effect (named after Rashid Sunyaev and Yakov B. Zel'dovich and often abbreviated as the SZ effect) is the distortion of the cosmic microwave background radiation (CMB) through inverse Compton scattering by high-energy electrons in galaxy clusters, in which the low-energy CMB photons receive an average energy boost during collision with the high-energy cluster electrons. Observed distortions of the cosmic microwave background spectrum are used to detect the density perturbations of the universe. Using the Sunyaev–Zel'dovich effect, dense clusters of galaxies have been observed.
The Sunyaev–Zel'dovich effect can be divided into:
- thermal effects, where the CMB photons interact with electrons that have high energies due to their temperature
- kinematic effects, a second-order effect where the CMB photons interact with electrons that have high energies due to their bulk motion (also called the Ostriker–Vishniac effect, after Jeremiah P. Ostriker and Ethan Vishniac.)
Rashid Sunyaev and Yakov Zel'dovich predicted the effect, and conducted research in 1969, 1972, and 1980. The Sunyaev–Zel'dovich effect is of major astrophysical and cosmological interest. It can help determine the value of the Hubble constant. To distinguish the SZ effect due to galaxy clusters from ordinary density perturbations, both the spectral dependence and the spatial dependence of fluctuations in the cosmic microwave background are used. Analysis of CMB data at higher angular resolution (high -values) requires taking into account the Sunyaev–Zel'dovich effect.
Current research is focused on modelling how the effect is generated by the intracluster plasma in galaxy clusters, and on using the effect to estimate the Hubble constant and to separate different components in the angular average statistics of fluctuations in the background. Hydrodynamic structure formation simulations are being studied to gain data on thermal and kinetic effects in the theory. Observations are difficult due to the small amplitude of the effect and to confusion with experimental error and other sources of CMB temperature fluctuations. However, since the Sunyaev–Zel'dovich effect is a scattering effect, its magnitude is independent of redshift. This is very important: it means that clusters at high redshift can be detected just as easily as those at low redshift. Another factor which facilitates high-redshift cluster detection is the angular scale versus redshift relation: it changes little between redshifts of 0.3 and 2, meaning that clusters between these redshifts have similar sizes on the sky. The use of surveys of clusters detected by their Sunyaev–Zel'dovich effect for the determination of cosmological parameters has been demonstrated by Barbosa et al. (1996). This might help in understanding the dynamics of dark energy in surveys (South Pole Telescope, Atacama Cosmology Telescope, Planck).
Timeline of observations
- 1983 – Researchers from the Cambridge Radio Astronomy Group and the Owens Valley Radio Observatory first detect the Sunyaev–Zel'dovich effect from clusters of galaxies.
- 1993 – The Ryle Telescope is the first telescope to image a cluster of galaxies in the Sunyaev–Zel'dovich effect.
- 2003 – The WMAP spacecraft maps the Cosmic Microwave Background (CMB) over the whole sky with some (limited) sensitivity to the Sunyaev–Zel'dovich effect
- 2005 – The Atacama Pathfinder Experiment – Sunyaev–Zel'dovich camera saw first light and shortly after began pointed observations of galaxy clusters.
- 2005 – The Arcminute Microkelvin Imager and the Sunyaev–Zel'dovich Array each begin surveys for very high-redshift clusters of galaxies using the Sunyaev–Zel'dovich effect
- 2007 – The South Pole Telescope (SPT) saw first light on 16 February 2007, and began science observations in March of that same year.
- 2007 – The Atacama Cosmology Telescope (ACT) saw first light on 8 June, and will soon begin an SZ survey of galaxy clusters.
- 2008 – The South Pole Telescope (SPT) discover for the first time galaxy clusters via the SZ effect.
- 2009 – The Planck spacecraft, launched on 14 May 2009, to realize a full sky SZ survey of galaxy clusters.
- 2012 – The Atacama Cosmology Telescope (ACT) performs the first statistical detection of the kinematic SZ effect.
- 2012 – The first detection of the kinematic SZ effect in an object is observed in MACS J0717.5+3745, confirmed in 2013.
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