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arXiv 1304.0989astro-ph.HEastro-ph.COhep-ph
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长蛇座星系团X射线观测对类轴子粒子的约束

Constraints on axion-like particles from X-ray observations of Hydra galaxy cluster

Denis Wouters, Pierre Brun

摘要:

类轴子粒子(ALP)属于一类新的赝标粒子,通常与光子耦合,从而打开了在外部磁场中从光子振荡到ALP的可能性。在目睹了它们的磁场的动荡之后,这些振荡预计会在天体物理源光谱的有限能量范围内留下不规则的印记。在这项研究中,钱德拉观测的长蛇座星系团被用来限制的值的耦合的ALP光子。我们考虑来自中心源Hydra A的X射线光子在星系团磁场中的转换。磁场强度和结构通过观测很好地确定,这增加了分析的鲁棒性。Hydra A的X射线光谱中没有异常不规则性保守地提供了对ALP质量低于7 e-12 eV的耦合常数的最有竞争力的约束,g < 8.3e-12 GeV-1,置信水平为95%。由于所涉及的特殊现象学,这些约束实际上更普遍地适用于非常轻的伪南布-戈德斯通玻色子。

英文摘要:

Axion-like particles (ALPs) belong to a class of new pseudoscalar particles that generically couple to photons, opening the possibility of oscillations from photons into ALPs in an external magnetic field. Having witnessed the turbulence of their magnetic fields, these oscillations are expected to imprint irregularities in a limited energy range of the spectrum of astrophysical sources. In this study, Chandra observations of the Hydra galaxy cluster are used to constrain the value of the coupling of ALPs to photons. We consider the conversion of X-ray photons from the central source Hydra A in the magnetic field of the cluster. The magnetic field strength and structure are well determined observationally, which adds to the robustness of the analysis. The absence of anomalous irregularities in the X-ray spectrum of Hydra A conservatively provides the most competitive constraints on the coupling constant for ALP masses below 7e-12 eV at the level of g < 8.3e-12 GeV-1 at the 95% confidence level. Because of the specific phenomenology involved, these constraints actually hold more generally for very light pseudo-Nambu-Goldstone bosons.

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