论文标题
与闯入者的线强度映射的宇宙学约束
Cosmological constraints from line intensity mapping with interlopers
论文作者
论文摘要
了解宇宙的形成和演变对于宇宙学研究至关重要，并且线强度映射为此类研究提供了强大的工具。我们建议利用红移空间线强度功率谱的多极力矩来限制宇宙学和天体物理参数，例如暗能量的状态，大规模中微子，原始非高斯语和星形形成速率密度。例如，我们生成了H-Alpha 6563AA，[OIII] 5007AA和[OII] 3727AA的多极功率光谱的模拟数据，该数据通过z = 1在Z = 1处测量的[OII] 3727AA考虑了Interloper系列的污染，并使用Markov Chain Carlo（MCMC）方法来构造参数。我们发现参数的良好拟合结果与它们的基准值相比，这意味着多极功率谱可以有效地区分信号和跨行器线，并破坏参数之间的脱位，例如线平均强度和偏置。我们还在约束中使用CSST（中国空间站望远镜）光谱型Galaxy调查探索交叉功率谱。由于可以通过在较高的红移到Z = 3的较高的发射线进行测量来获得更准确的拟合结果，并且至少可以涉及发射线之间的互相关，因此有望在未来的宇宙学和天体物理学研究中提供良好的效果。
Understanding the formation and evolution of the Universe is crucial for cosmological studies, and the line intensity mapping provides a powerful tool for this kind of study. We propose to make use of multipole moments of redshift-space line intensity power spectrum to constrain the cosmological and astrophysical parameters, such as the equation of state of dark energy, massive neutrinos, primordial non-Gaussianity, and star formation rate density. As an example, we generate mock data of multipole power spectra for H-alpha 6563AA, [OIII] 5007AA and [OII] 3727AA measured by SPHEREx experiment at z=1 considering contaminations from interloper lines, and use Markov Chain Monte Carlo (MCMC) method to constrain the parameters in the model. We find a good fitting result of the parameters compared to their fiducial values, which means that the multipole power spectrum can effectively distinguish signal and interloper lines, and break the degeneracies between parameters, such as line mean intensity and bias. We also explore the cross power spectrum with CSST (Chinese Space Station Telescope) spectroscopic galaxy survey in the constraints. Since more accurate fitting results can be obtained by including measurements of the emission lines at higher redshifts out to z=3 at least and cross-correlations between emission lines can be involved, the line intensity mapping is expected to offer excellent results in future cosmological and astrophysical studies.
