论文标题
一项针对各种可观察力的遥远的类星体中偶极信号的研究
A study of Dipolar Signal in distant Quasars with various observables
论文作者
论文摘要
我们使用不同的可观察力研究了Catwise2020目录中AGNS/类星体中各向异性的信号。早些时候，该数据显示了源数计数中偶极子各向异性的强信号。我们使用两个独立的数据分析程序测试了这一主张，并找到与早期结果一致的数量计数偶极子。除了数字计数外，我们还测试了另外两个可观察到的各向异性信号 - 平均频谱索引$ \barα$和平均通量密度$ \ bar {b} $。我们发现平均光谱指数和平均通量密度的强度相当强的偶极信号。平均通量密度的偶极子指向银河系中心，并在施加磁通切割以去除大于1 mJy的源后变得非常弱。这可以归因于某些明亮来源的存在。然而，平均光谱指数中的信号与通量和银河切割的函数相对稳定。这个可观察到的偶极子与银河中心大致相反，因此很可能是由于银河偏置而产生的。因此，平均光谱指数和平均通量密度的信号似乎与各向同性一致。
We study the signal of anisotropy in AGNs/quasars of CatWISE2020 catalogue using different observables. It has been reported earlier that this data shows a strong signal of dipole anisotropy in the source number counts. We test this claim using two independent data analysis procedures and find our number count dipole consistent with the earlier results. In addition to number counts, we test for the anisotropy signal in two other observables -- mean spectral index $\barα$ and mean flux density $\bar{B}$. We find a dipole signal of considerable strength both in the mean spectral index and the mean flux density. The dipole in mean flux density points towards the galactic center and becomes very weak after imposing a flux cut to remove sources with flux greater than 1 mJy. This can be attributed to the presence of some bright sources. The signal in mean spectral index, however, is relatively stable as a function of both flux and galactic cuts. The dipole in this observable points roughly opposite to the galactic center and hence most likely arises due to galactic bias. Hence, the signal in both the mean spectral index and mean flux density appears to be consistent with isotropy.
