2013/09/30 by Jens Chluba, Liang Dai
Earth and Planetary Sciences · Physics and Astronomy · #Anisotropy #Astrophysics #Cluster (spacecraft) #Computational physics #Cosmic background radiation #Cosmic microwave background #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Geophysics and Gravity Measurements #Line-of-sight #Observable #Optics #Physics #Quantum mechanics #Scattering #Spectral line #Thomson scattering #astro-ph.CO
paper · pdf · doi:10.1093/mnras/stt2277
11 pages, 7 figures, 1 table, minor changes, accepted by MNRAS
openalex publication_date 2013/12/19 · arxiv created 2013/12/20 · arxiv updated 2015/06/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study the multiple scattering Sunyaev–Zeldovich (SZ) signature, extending our previous analysis to high-temperature clusters. We consistently treat the anisotropy of the ambient radiation field caused by the first scattering and also consider lowest order kinematic terms. We show that due to temperature corrections monopole through octupole anisotropy of the singly scattered SZ signal attain different spectra in the second scattering. The difference becomes more pronounced at high temperature, and thus could be used to constrain individual line-of-sight moments of the electron density and temperature profiles. While very challenging from the observational point of view, this further extends the list of possible SZ observables that will be important for 3D cluster-profile reconstruction, possibly helping to break geometric degeneracies caused by projection effects. We also briefly discuss the scattering of primordial cosmic microwave background anisotropies by SZ clusters.