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Article overview
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Sunyaev-Zeldovich signal processing and temperature-velocity moment method for individual clusters | | Jens Chluba
; Eric R. Switzer
; Daisuke Nagai
; Kaylea Nelson
; | | Date: |
14 Nov 2012 | | Abstract: | Future high resolution, high sensitivity Sunyaev-Zeldovich (SZ) observations
of individual clusters will provide an exciting opportunity to ask specific
questions about the dynamical state of the intra-cluster medium (ICM). In this
paper we develop a new method that clearly shows the connection of the SZ
signal with the cluster model. We include relativistic temperature and
kinematic corrections in the single-scattering approximation, allowing studies
of hot clusters. In our approach, particular moments of the temperature and
velocity field along the line-of-sight determine the precise spectral shape and
morphology of the SZ signal. We illustrate how to apply our method to different
cluster models, highlighting parameter degeneracies and instrumental effects
that are important for interpreting future high-resolution SZ data. Our
analysis shows that line-of-sight temperature variations can introduce
significant biases in the derived SZ temperature and peculiar velocity. We
furthermore discuss how the position of the SZ null is affected by the
cluster’s temperature and velocity structure. Our computations indicate that
the SZ signal around the null alone is rather insensitive to different cluster
models and that high frequency channels add a large leverage in this respect.
We also apply our method to recent high sensitivity SZ data of the Bullet
cluster, showing how the results can be linked to line-of-sight variations in
the electron temperature. The tools developed here as part of SZpack should be
useful for analyzing high-resolution SZ data and computing SZ maps from
simulated clusters. | | Source: | arXiv, 1211.3206 | | Services: | Forum | Review | PDF | Favorites | |
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