The Subaru FMOS galaxy redshift survey (FastSound). IV. New constraint on gravity theory from redshift space distortions at z ∼ 1.4
The Subaru FMOS galaxy redshift survey (FastSound). IV. New constraint on gravity theory from redshift space distortions at z ∼ 1.4
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DOI：
10.1093/pasj/psw029
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发表时间：
2015-11
影响因子：
2.3
通讯作者：
T. Okumura;C. Hikage;T. Totani;Motonari Tonegawa;Hiroyuki Okada;K. Glazebrook;C. Blake;P. Ferreira;S. More;A. Taruya;S. Tsujikawa;M. Akiyama;G. Dalton;T. Goto;Takashi Ishikawa;F. Iwamuro;T. Matsubara;T. Nishimichi;K. Ohta;I. Shimizu;R. Takahashi;N. Takato;N. Tamura;K. Yabe;N. Yoshida
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作者：
T. Okumura;C. Hikage;T. Totani;Motonari Tonegawa;Hiroyuki Okada;K. Glazebrook;C. Blake;P. Ferreira;S. More;A. Taruya;S. Tsujikawa;M. Akiyama;G. Dalton;T. Goto;Takashi Ishikawa;F. Iwamuro;T. Matsubara;T. Nishimichi;K. Ohta;I. Shimizu;R. Takahashi;N. Takato;N. Tamura;K. Yabe;N. Yoshida
我们测量的红移空间相关函数的光谱样本的2783发射线星系的FastSound调查。该调查使用斯巴鲁望远镜，覆盖了1.19 <z$<1.55$的红移范围，是第一次在如此高的红移范围内进行宇宙学研究。我们检测到明确的各向异性，由于红移空间失真（RSD）的相关函数作为分离平行和垂直的视线和四极矩的函数。RSD已被广泛用于检验广义相对论在宇宙学尺度在$z<1$。采用具有固定膨胀历史和无速度色散的LCDM宇宙学，利用8 Mpc/h以上尺度的RSD测量，我们在边缘化星系偏置参数$B（z）\sigma_8（z）$后，得到了红移处增长率的第一个约束：$f（z）\sigma_8（z）=0.482\pm 0.116$ at $z\sim 1.4$.这对应于RSD的4.2\sigma $检测。我们的约束是一致的预测广义相对论$f\sigma_8\sim 0.392$在$1-\sigma$的置信水平。当我们允许$\sigma_{\rm v}$变化并将其边缘化时，增长率约束变为$f\sigma_8=0.494^{+0.126}_{-0.120}$。我们还表明，通过结合低z约束的$f\sigma_8$，高z星系调查，如FastSound可以是有用的区分修改后的重力模型，而不依赖于CMB各向异性实验。
We measure the redshift-space correlation function from a spectroscopic sample of 2783 emission line galaxies from the FastSound survey. The survey, which uses the Subaru Telescope and covers the redshift ranges of $1.19<$z$<1.55$, is the first cosmological study at such high redshifts. We detect clear anisotropy due to redshift-space distortions (RSD) both in the correlation function as a function of separations parallel and perpendicular to the line of sight and its quadrupole moment. RSD has been extensively used to test general relativity on cosmological scales at $z<1$. Adopting a LCDM cosmology with the fixed expansion history and no velocity dispersion $\sigma_{\rm v}=0$, and using the RSD measurements on scales above 8Mpc/h, we obtain the first constraint on the growth rate at the redshift, $f(z)\sigma_8(z)=0.482\pm 0.116$ at $z\sim 1.4$ after marginalizing over the galaxy bias parameter $b(z)\sigma_8(z)$. This corresponds to $4.2\sigma$ detection of RSD. Our constraint is consistent with the prediction of general relativity $f\sigma_8\sim 0.392$ within the $1-\sigma$ confidence level. When we allow $\sigma_{\rm v}$ to vary and marginalize it over, the growth rate constraint becomes $f\sigma_8=0.494^{+0.126}_{-0.120}$. We also demonstrate that by combining with the low-z constraints on $f\sigma_8$, high-z galaxy surveys like the FastSound can be useful to distinguish modified gravity models without relying on CMB anisotropy experiments.