Diffuse sources, clustering, and the excess anisotropy of the radio synchrotron background

Diffuse sources, clustering, and the excess anisotropy of the radio synchrotron background
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射电同步加速器背景的漫射源、聚类和过度各向异性

DOI:
10.1093/mnras/stad1671
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发表时间:
2023
影响因子:
4.8
通讯作者:
Lucero, D. M.
Lucero, D. M.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Cowie, F. J.;Offringa, A. R.;Gehlot, B. K.;Singal, J.;Heston, S.;Horiuchi, S.;Lucero, D. M.

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本文给出了迄今为止最大的射电同步加速器背景(RSB)低频(120 MHz)角分分辨率图像及其相应的各向异性角功率谱(APS),角标度范围从3°到0.3角分。我们发现,北天极周围的RSB有一个显着的过剩各向异性功率在所有尺度上的非聚集点源的模型的基础上的源计数已知的源类。这种各向异性过剩,这似乎并不归因于弥漫的银河系发射,可能与表面亮度过剩的RSB。为了更好地理解所测量的APS中包含的信息,我们对RSB进行建模,改变潜在源的亮度分布,大小和角度聚类。我们发现,所观察到的APS可以产生的人口微弱的聚集点源,只有当聚类是极端的高斯集群的大小是101 arcmin。我们还表明,所观察到的APS可以由一个人口的微弱的扩散源的大小为101弧分,这是支持我们的图像中存在的功能。这两种情况也会导致相关的表面亮度过剩。这些类的来源是在一个参数空间没有很好地探测,即使是最深的无线电调查的日期。
We present the largest low frequency (120 MHz) arcminute resolution image of the radio synchrotron background (RSB) to date, and its corresponding angular power spectrum of anisotropies (APS) with angular scales ranging from 3° to 0.3 arcmin. We show that the RSB around the north celestial pole has a significant excess anisotropy power at all scales over a model of unclustered point sources based on source counts of known source classes. This anisotropy excess, which does not seem attributable to the diffuse Galactic emission, could be linked to the surface brightness excess of the RSB. To better understand the information contained within the measured APS, we model the RSB varying the brightness distribution, size, and angular clustering of potential sources. We show that the observed APS could be produced by a population of faint clustered point sources only if the clustering is extreme and the size of the Gaussian clusters is ≲1 arcmin. We also show that the observed APS could be produced by a population of faint diffuse sources with sizes ≲1 arcmin, and this is supported by features present in our image. Both of these cases would also cause an associated surface brightness excess. These classes of sources are in a parameter space not well probed by even the deepest radio surveys to date.
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