Improving redshift-space power spectra of halo intrinsic alignments from perturbation theory
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866912406934913024 |
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| author | Taruya, Atsushi Kurita, Toshiki Okumura, Teppei |
| author_facet | Taruya, Atsushi Kurita, Toshiki Okumura, Teppei |
| contents | Intrinsic alignments (IAs) of galaxies/halos observed via galaxy imaging survey, combined with redshift information, offer a novel probe of cosmology as a tracer of the tidal force field of a large-scale structure. In this paper, we present a perturbation theory based model for the redshift-space power spectra of galaxy/halo IAs that can keep the impact of the Finger-of-God damping effect, known as a nonlinear systematics of redshift-space distortions, under control. Focusing particularly on galaxy/halo density and an IA cross power spectrum, we derive analytically the explicit expressions for the next-to-leading order corrections. Comparing the model predictions with $N$-body simulations, we show that these corrections indeed play an important role for an unbiased determination of the growth-rate parameter, and hence the model proposed here can be used for a precision test of gravity on cosmological scales. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_06616 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Improving redshift-space power spectra of halo intrinsic alignments from perturbation theory Taruya, Atsushi Kurita, Toshiki Okumura, Teppei Cosmology and Nongalactic Astrophysics Intrinsic alignments (IAs) of galaxies/halos observed via galaxy imaging survey, combined with redshift information, offer a novel probe of cosmology as a tracer of the tidal force field of a large-scale structure. In this paper, we present a perturbation theory based model for the redshift-space power spectra of galaxy/halo IAs that can keep the impact of the Finger-of-God damping effect, known as a nonlinear systematics of redshift-space distortions, under control. Focusing particularly on galaxy/halo density and an IA cross power spectrum, we derive analytically the explicit expressions for the next-to-leading order corrections. Comparing the model predictions with $N$-body simulations, we show that these corrections indeed play an important role for an unbiased determination of the growth-rate parameter, and hence the model proposed here can be used for a precision test of gravity on cosmological scales. |
| title | Improving redshift-space power spectra of halo intrinsic alignments from perturbation theory |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2409.06616 |