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Studying the leptonic structure of galaxy cluster atmospheres from the spectral properties of the SZ effect
ASI Science Data Center, ASDC c/o ESRIN, Italy ; ASI, Italy ; INAF – Osservatorio Astronomico di Roma, Italy.
Moscow Institute of Physics and Technology, Russia ; Université Pierre et Marie Curie, France.ORCID iD: 0000-0001-6511-4330
Lebedev Physical Institute, Russia.
2009 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 494, no 1, 1-9 p.Article in journal (Refereed) Published
Abstract [en]

We study the energetics of galaxy-cluster atmospheres by analyzing the SZ effect spectra around the crossover frequency. We calculate analytically the expressions of both the crossover frequency and the spectral slope of the SZE around the crossover frequency in various cases: a thermal electron population; a power-law, non-thermal, electron population; and a population of electrons experiencing a stochastic acceleration. We find that the value of the crossover frequency X0 of the SZE depends significantly on the cluster peculiar velocity Vr which determines the amplitude of the kinematic SZE), while the value of the slope of the SZE does not depend on the kinematic SZE spectrum in the optimal frequency range around the crossover frequency of the thermal SZE, i.e. in the frequency range x = 3.5 - 4.5. Therefore, while the amplitude of the SZ   produces a systematic bias in the position of the crossover frequency X0, it does not affect significantly the spectral slope of the SZE. We therefore propose using measurements of the spectral slope of the SZE to obtain unbiased information about the specific properties of various electron distributions in galaxy clusters as well as in other cosmic structures in which a SZE can be produced.

Place, publisher, year, edition, pages
EDP Sciences, 2009. Vol. 494, no 1, 1-9 p.
Keyword [en]
cosmology: theory, galaxies: clusters: general, cosmology: cosmic microwave background
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics, Astroparticle Physics
URN: urn:nbn:se:lnu:diva-42867DOI: 10.1051/0004-6361:200810111OAI: diva2:807540
Available from: 2015-04-23 Created: 2015-04-23 Last updated: 2015-08-13Bibliographically approved

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