Mapping the temperature of the intra-cluster medium with the thermal Sunyaev-Zel’dovich effect
The hot electrons in the intra-cluster medium produce a spectral distortion of the cosmic microwave background (CMB) black body emission, the thermal Sunyaev-Zel’dovich effect (tSZ). This characteristic spectral distortion is now commonly used to detect and characterize the properties of galaxy clus...
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| Main Authors: | , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
14 August 2017
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| In: |
Astronomy and astrophysics
Year: 2017, Volume: 604 |
| ISSN: | 1432-0746 |
| DOI: | 10.1051/0004-6361/201629993 |
| Online Access: | Verlag, kostenfrei, Volltext: https://doi.org/10.1051/0004-6361/201629993 Verlag, kostenfrei, Volltext: https://www.aanda.org/articles/aa/abs/2017/08/aa29993-16/aa29993-16.html 
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| Author Notes: | G. Hurier, C. Tchernin |
MARC
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| 520 | |a The hot electrons in the intra-cluster medium produce a spectral distortion of the cosmic microwave background (CMB) black body emission, the thermal Sunyaev-Zel’dovich effect (tSZ). This characteristic spectral distortion is now commonly used to detect and characterize the properties of galaxy clusters. The tSZ effect spectral distortion does not depend on the redshift, and is only slightly affected by the galaxy cluster properties via the relativistic corrections, when the electrons reach relativistic velocities. The present work proposes a linear component separation approach to extract the tSZ effect Compton parameter and relativistic corrections for next-generation CMB experiments. We demonstrated that relativistic corrections, if neglected, would induce a significant bias on the galaxy cluster Compton parameter, the tSZ scaling relation slope, as well as tSZ angular power spectrum shape measurements. We showed that tSZ relativistic correction mapping can be achieved at high signal-to-noise ratio with a low level of contamination up to <i>ℓ<i/> = 3000 for next-generation CMB experiments. At smaller angular scales the contamination produced by infrared emission will be a significant source of bias. Such tSZ relativistic correction mapping enables the study of galaxy cluster temperature profile via the tSZ effect only. | ||
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