论文标题
限制环境培养基中的磁场
Constraining Magnetic Fields in the Circumgalactic Medium
论文作者
论文摘要
我们通过将$ z <1 $星系的磁场在$ \ sim $ \ sim 1,000 $ high-redshift无线电源与前景星系数密度密度相关联，研究了$ z <1 $星系的磁场的性能。这种方法使我们能够提取通过介入多个星系中的气体介入的旋转措施信号。我们的结果表明，与以前的几个结果相反，旋转度量分布与前景星系的数量之间没有可检测的相关性。利用非检测信号，我们估计$3σ$上限到上限为$ \ sim 20 \ rm \ rad / m^{2} $在〜50 kpc和$ \ sim 10 \ rm \ rm \ rad / m^{2} $内，分别为$ 100 $ kpc。通过采用从吸收管线测量值获得的电离气体的柱密度分布，我们进一步估计了CGM中与$ <\ rm 2 \μg$的视线平行的相干磁场的强度。我们表明，旋转措施和磁场强度的估计上限足以限制最近的Galaxy Magneto-Hydrodnynalnical动力学模拟的输出。最后，我们讨论了结果与以前的作品之间不一致的可能原因。
We study the properties of magnetic fields in the circumgalactic medium (CGM) of $z<1$ galaxies by correlating Faraday rotation measures of $\sim 1,000$ high-redshift radio sources with the foreground galaxy number density estimated from the DESI Legacy Imaging Surveys. This method enables us to extract signals of rotation measures contributed by intervening gas around multiple galaxies. Our results show that there is no detectable correlation between the distribution of rotation measures and the number of foreground galaxies, contrary to several previous results. Utilizing the non-detection signals, we estimate $3σ$ upper limits to the rotation measures from the CGM of $\sim 20 \rm \ rad/m^{2}$ within~50 kpc and $\sim 10 \rm \ rad / m^{2}$ at separations of $100$ kpc. By adopting a column density distribution of ionized gas obtained from absorption line measurements, we further estimate the strengths of coherent magnetic fields parallel to the line of sight of $<\rm 2 \ μG$ in the CGM. We show that the estimated upper limits of rotation measures and magnetic field strengths are sufficient to constrain outputs of recent galaxy magneto-hydrodynamic simulations. Finally, we discuss possible causes for the inconsistency between our results and previous works.
