Breaking baryon-cosmology degeneracy with the electron density power spectrum
Breaking baryon-cosmology degeneracy with the electron density power spectrum
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DOI：
10.1088/1475-7516/2022/04/046
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发表时间：
2022-01
影响因子：
6.4
通讯作者：
A. Nicola;F. Villaescusa-Navarro;D. Spergel;J. Dunkley;D. Angl'es-Alc'azar;Romeel Dav'e;S. Genel;L. Hernquist;D. Nagai;R. Somerville;Benjamin Dan Wandelt
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作者：
A. Nicola;F. Villaescusa-Navarro;D. Spergel;J. Dunkley;D. Angl'es-Alc'azar;Romeel Dav'e;S. Genel;L. Hernquist;D. Nagai;R. Somerville;Benjamin Dan Wandelt
星系中不确定的反馈过程会影响物质的分布，目前限制了弱透镜巡天的能力。如果我们能够确定对这些不确定性具有鲁棒性的宇宙学统计，或者通过其他方式限制这些影响，那么我们就可以增强当前和即将到来的弱透镜巡天观测的能力，如DES，欧几里得，鲁宾天文台和罗马太空望远镜。在这项工作中，我们调查的潜力，电子密度自功率谱作为一个强大的宇宙学和重子反馈探针。我们使用一套（磁）流体动力学模拟从CAMELS项目，并进行了理想化的分析，预测统计的不确定性有限的宇宙学和物理动机的天体物理参数。我们发现，电子数密度自相关，通过运动学Sunyaev-Zel'dovich观测或通过快速射电爆发色散措施，提供了严格的限制Ω m和中质量晕，f bar的平均重子分数。通过获得相关的系统的不确定性的经验措施，我们发现这些约束在很大程度上是强大的重子反馈模型中实现的流体动力学模拟的差异。我们进一步讨论了与我们的分析相关的主要警告，并指出未来工作的可能方向。
Uncertain feedback processes in galaxies affect the distribution of matter, currently limiting the power of weak lensing surveys. If we can identify cosmological statistics that are robust against these uncertainties, or constrain these effects by other means, then we can enhance the power of current and upcoming observations from weak lensing surveys such as DES, Euclid, the Rubin Observatory, and the Roman Space Telescope. In this work, we investigate the potential of the electron density auto-power spectrum as a robust probe of cosmology and baryonic feedback. We use a suite of (magneto-)hydrodynamic simulations from the CAMELS project and perform an idealized analysis to forecast statistical uncertainties on a limited set of cosmological and physically-motivated astrophysical parameters. We find that the electron number density auto-correlation, measurable through either kinematic Sunyaev-Zel'dovich observations or through Fast Radio Burst dispersion measures, provides tight constraints on Ω m and the mean baryon fraction in intermediate-mass halos, f̅ bar. By obtaining an empirical measure for the associated systematic uncertainties, we find these constraints to be largely robust to differences in baryonic feedback models implemented in hydrodynamic simulations. We further discuss the main caveats associated with our analysis, and point out possible directions for future work.