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arXiv 2401.04698astro-ph.CO
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焦散与流体静力学质量偏差:对修改引力理论的启示

Caustic and hydrostatic mass bias: Implications for modified gravity

Minahil Adil Butt, Balakrishna S. Haridasu, Yacer Boumechta, Francesco Benetti, Lorenzo Pizzuti, Carlo Baccigalupi, Andrea Lapi

AI总结:

本研究提出星系团流体静力学与焦散质量估计技术的联合分析方法,通过引入流体静力学约束的星系团假设缓解质量偏差,在A2029、A2142星系团上验证了概念,可改进对变色龙屏蔽、瓦因施泰因屏蔽等修改引力场景的约束。

摘要:

我们提出并开展了星系团两种不同质量估计方法(即流体静力学技术与caustic(焦散)技术)的联合分析。首先,我们全面证明,若在焦散技术中采用经流体静力学技术约束的星系团特异性假设,两种技术间的质量偏差或可得到缓解。虽然表面上这会降低焦散技术作为完全独立方法的地位,但它能让我们进一步收紧星系团质量的约束,进而得以检验引力修正理论。我们针对两个观测充分的大质量星系团A2029和A2142应用了上述理论框架,以此验证概念可行性。在当前实现中,我们用该方法约束Chameleon screening(变色龙屏蔽)和Vainshtein screening(瓦因施泰因屏蔽)。正如预期,我们证明联合分析有助于改进对这些修改引力场景的约束。

英文摘要:

We propose and perform a joint analysis of the two different mass estimates of galaxy clusters, namely the hydrostatic and caustic techniques. Firstly, we show comprehensively that the mass bias between these two techniques can be possibly alleviated when cluster-specific assumptions constrained using the hydrostatic technique are utilized within the caustic technique. While at face value this demotes the caustic technique from a completely independent method, this allows one to further tighten the constraints on the cluster mass and subsequently, allow us to test modifications to gravity. Implementing the aforementioned formalism for two well-observed massive galaxy clusters, A2029 and A2142, we highlight the proof of concept. In the current implementation, we use this method to constrain the Chameleon screening and Vainshtein screening. As anticipated, we show that the joint analysis can help improve the constraints on these modified gravity scenarios.

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