当前位置: X-MOL 学术Astron. Astrophys. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Search and analysis of giant radio galaxies with associated nuclei (SAGAN)
Astronomy & Astrophysics ( IF 5.4 ) Pub Date : 2024-06-28 , DOI: 10.1051/0004-6361/202450011
Shishir Sankhyayan , Pratik Dabhade

We investigated the prevalence of giant radio galaxies (GRGs), some of the largest structures powered by supermassive black holes, within supercluster environments, and the influence of such environments on their properties. Utilising two large catalogues of superclusters (401) and GRGs (1446), we established the existence of 77 GRGs (5.3%) residing in 64 superclusters (16%) within 0.05 ≤ z ≤ 0.42. Among the 77 GRGs found in superclusters, we identified ∼70% as residing within galaxy clusters. Within the subset of GRGs not located in superclusters, which constitutes 94.7% of the sample, a mere 21% are associated with galaxy clusters, while the remaining majority are situated in sparser environments. We examined the influence of differing environments, such as cluster versus non-cluster and supercluster versus non-supercluster regions, on the size of GRGs, while also exploring the driving factors behind their overall growth. Our findings show that the largest GRGs (≳3 Mpc) grow in underdense environments beyond the confines of dense environments. Moreover, we show that ∼24% of 1446 GRGs reside in galaxy clusters. We conclude that GRGs preferentially grow in sparser regions of the cosmic web and have a significantly larger median size. Finally, we demonstrate the potential of GRGs as astrophysical probes with specific cases where GRGs, exhibiting polarised emissions and located behind superclusters (acting as natural Faraday screens), were used to estimate magnetic field strengths of the supercluster environment at sub-microgauss levels.

中文翻译:


具有相关核的巨型射电星系的搜索和分析(SAGAN)



我们研究了超星系团环境中巨型射电星系(GRG)的普遍性,以及这些环境对其特性的影响,其中巨型射电星系是由超大质量黑洞提供动力的一些最大结构。利用超星系团 (401) 和 GRG (1446) 的两个大型目录,我们确定了 0.05 ≤ z ≤ 0.42 范围内的 64 个超星系团 (16%) 中存在 77 个 GRG (5.3%)。在超星系团中发现的 77 个 GRG 中,我们确定约 70% 位于星系团内。在不位于超星系团中的 GRG 子集中(占样本的 94.7%),只有 21% 与星系团相关,而其余大部分位于稀疏环境中。我们研究了不同环境(例如集群与非集群、超集群与非超集群区域)对 GRG 大小的影响,同时还探讨了其整体增长背后的驱动因素。我们的研究结果表明,最大的 GRG (≳3 Mpc) 在低密度环境中生长,超出了密集环境的范围。此外,我们表明 1446 个 GRG 中约有 24% 位于星系团中。我们得出的结论是,GRG 优先生长在宇宙网的稀疏区域,并且具有明显更大的中值尺寸。最后,我们通过特定案例展示了 GRG 作为天体物理探测器的潜力,其中 GRG 表现出偏振发射并位于超星团后面(充当天然法拉第屏幕),用于估计亚微高斯水平的超星团环境的磁场强度。
更新日期:2024-06-28