Testing tidal alignment models for anisotropic correlations of halo ellipticities with N-body simulations. (arXiv:2001.05302v1 [astro-ph.CO])

Testing tidal alignment models for anisotropic correlations of halo ellipticities with N-body simulations. (arXiv:2001.05302v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Okumura_T/0/1/0/all/0/1">Teppei Okumura</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Taruya_A/0/1/0/all/0/1">Atsushi Taruya</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nishimichi_T/0/1/0/all/0/1">Takahiro Nishimichi</a>

There is a growing interest of using the intrinsic alignment (IA) of galaxy
images as a tool to extract cosmological information complimentary to galaxy
clustering analysis. Recently, Okumura & Taruya derived useful formulas for the
intrinsic ellipticity–ellipticity correlation, the gravitational
shear–intrinsic ellipticity correlation, and the velocity–intrinsic
ellipticity correlation functions based on the linear alignment (LA) model. In
this paper, using large-volume $N$-body simulations, we measure these alignment
statistics in real and redshift space and compare them to the LA and nonlinear
alignment model predictions. We find that anisotropic features of baryon
acoustic oscillations in the IA statistics can be accurately predicted by our
models. The anisotropy due to redshift-space distortions (RSDs) is also well
described in the large-scale limit. Our results indicate that one can extract
the cosmological information encoded in the IA through the Alcock-Paczynski and
RSD effects.

There is a growing interest of using the intrinsic alignment (IA) of galaxy
images as a tool to extract cosmological information complimentary to galaxy
clustering analysis. Recently, Okumura & Taruya derived useful formulas for the
intrinsic ellipticity–ellipticity correlation, the gravitational
shear–intrinsic ellipticity correlation, and the velocity–intrinsic
ellipticity correlation functions based on the linear alignment (LA) model. In
this paper, using large-volume $N$-body simulations, we measure these alignment
statistics in real and redshift space and compare them to the LA and nonlinear
alignment model predictions. We find that anisotropic features of baryon
acoustic oscillations in the IA statistics can be accurately predicted by our
models. The anisotropy due to redshift-space distortions (RSDs) is also well
described in the large-scale limit. Our results indicate that one can extract
the cosmological information encoded in the IA through the Alcock-Paczynski and
RSD effects.

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