High significance detection of the tSZ effect relativistic corrections

Abstract

The thermal Sunyaev-Zel'dovich (tSZ) effect is produced by the interaction of cosmic microwave background (CMB) photons with the hot (a few keV) and diffuse gas of electrons inside galaxy clusters integrated along the line of sight. This effect produces a distortion of CMB blackbody emission law. This distortion law depends on the electronic temperature of the intra-cluster hot gas, $T_e$, through the so-called tSZ relativistic corrections. In this work, we have performed a statistical analysis of the tSZ spectral distortion on large galaxy cluster samples. We performed a stacking analysis for several electronic temperature bins, using both spectroscopic measurements of X-ray temperatures and a scaling relation between X-ray luminosities and electronic temperatures. We report the first high significance detection of the relativistic tSZ at a significance of 5.3 $\sigma$. We also demonstrate that the observed tSZ relativistic corrections are consistent with X-ray deduced temperatures. This measurement of the tSZ spectral law demonstrates that tSZ effect spectral distorsion can be used as a probe to measure galaxy cluster temperatures.

References in corpus (2)

• LoCuSS: Comparison of Observed X-ray and Lensing Galaxy Cluster Scaling Relations with Simulations
• Bandpass Dependence of X-ray Temperatures in Galaxy Clusters

Cited by in corpus (8)

• CMB/kSZ and Compton-$y$ Maps from 2500 square degrees of SPT-SZ and Planck Survey Data
• Relativistic SZ temperature scaling relations of groups and clusters derived from the BAHAMAS and MACSIS simulations
• A multi-simulation study of relativistic SZ temperature scalings in galaxy clusters and groups
• Measurement of the Relativistic Sunyaev-Zeldovich Corrections in RX J1347.5-1145
• Atacama Large Aperture Submillimeter Telescope (AtLAST) Science: Resolving the Hot and Ionized Universe through the Sunyaev-Zeldovich effect
• Effect of the non-thermal Sunyaev-Zel'dovich Effect on the temperature determination of galaxy clusters
• Relativistic SZ maps and electron gas temperature spectroscopy
• Probing the low-energy spectrum of non-thermal electrons in galaxy clusters with soft gamma ray observations