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Appendix B
Effect of PSF on Parameter Constraints
As described in Section 2, the ellipticity of LRG is defined
by the isophote of the light profile while that of LOWZ and
CMASS galaxies is by the adaptive moment. Singh &
Mandelbaum (2016) constructed the shape catalog for the
LRG and LOWZ samples using a re-Gaussianization technique, which is based on the adaptive moment but involves
additional steps to correct for non-Gaussianity of both the PSF
and galaxy surface brightness profile (Hirata & Seljak 2003).
Utilizing it, Singh & Mandelbaum (2016) found that while the
isophotal shape is not corrected for the PSF, the measured IA
statistics are not so biased because the method uses the outer
shape of the galaxies. Eventually, the uncorrected PSF affects
only the amplitude of the measured IA statistics, not the shape,
which has already been confirmed by our earlier work
(Okumura et al. 2009). Furthermore, Okumura & Jing (2009)
showed that the amplitude of IA, namely the shape bias bK,
determined by the GI and II correlations is fully consistent with
each other. Therefore, while the constraint on bK can be
different from the true value, that on the growth rate f is not
expected to be biased after bK is marginalized over. While the
adaptive moment corrects for the PSF in the ellipticity, it results
in a small bias (Hirata & Seljak 2003). However, it is a constant
bias, and thus it affects the amplitude of bK , similarly to the
isophotal shape definition but the effect is smaller. To be
conservative, we exclude the II correlation at r > 25 h−1 Mpc,
which is affected if we adopt the less accurate, de Vaucouleurs
model fit (Singh & Mandelbaum 2016). Namely, the
constraints from LOWZ and CMASS samples on fσ8 with
rmin = 25 h-1 Mpc in Figure 5 do not use the data of the II
correlation., Nevertheless, the constraints are almost equivalent
to those with rmin = 15 h-1 Mpc. It implies that the bias that
arises from the uncorrected PSF is negligible for the shape
definition of LOWZ and CMASS galaxies.
For all the three galaxy samples, constrained values of the
model parameters do not change significantly by combining the
IA statistics with the clustering statistics but shrink the error
bars. It demonstrates that systematic effects associated with the
shape measurement do not contribute to biases in the parameter
...