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Article overview
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Will Kinematic Sunyaev-Zel'dovich Measurements Enhance the Science Return from Galaxy Redshift Surveys? | | Naonori S. Sugiyama
; Teppei Okumura
; David N. Spergel
; | | Date: |
21 Jun 2016 | | Abstract: | Yes. Future CMB experiments such as Advanced ACTPol and CMB-S4 should achieve
measurements with S/N of $> 0.1$ for the typical galaxies in redshift surveys.
These measurements will provide complementary measurements of the growth rate
of large scale structure $f$ and the expansion rate of the Universe $H$ to
galaxy clustering measurements. This paper emphasizes that there is significant
information in the anisotropy of the relative pairwise kSZ measurements. We
expand the relative pairwise kSZ power spectrum in Legendre polynomials and
consider up to its octopole. Assuming that the noise in the filtered maps is
uncorrelated between the positions of galaxies in the survey, we derive a
simple analytic form for the power spectrum covariance of the relative pairwise
kSZ temperature in redshift space. While many previous studies have assumed
optimistically that the optical depth of the galaxies $ au_{
m T}$ in the
survey is known, we marginalize over $ au_{
m T}$, to compute constraints on
the growth rate $f$ and the expansion rate $H$. For realistic sure parameters,
we find that combining kSZ and galaxy redshift survey data reduces the
marginalized $1$-$sigma$ errors on $H$ and $f$ by $sim50$-$70\%$ compared to
the galaxy-only analysis. | | Source: | arXiv, 1606.6367 | | Services: | Forum | Review | PDF | Favorites | |
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