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搜寻kpc尺度的低红移双活动星系核

Search for Kiloparsec-scale Dual Active Galactic Nuclei at Low Redshift

  • 摘要: 双活动星系核的研究对于理解星系和超大质量黑洞的形成、生长与演化至关重要. 然而, 目前已证认的双活动星系核数量仍较少, 这限制了对星系并合、双超大质量黑洞生长的预测以及低频引力波的探测. 基于百万类星体表, 证认了187例新的双活动星系核, 4例三重活动星系核以及1例四重活动星系核. 这些多重系统的红移均小于0.5, 每个系统中成员之间的投影物理距离(r_\rm p)不超过100 kpc, 视向速度差(\Delta v)小于600 km/s. 这一样本补充了现有的低红移双活动星系核样本, 对活动星系核形成以及双超大质量黑洞演化机制的研究有一定帮助. 对上述样本的光学与红外图像进行目视检查, 结果显示约24%的双活动星系核呈现出明显的潮汐特征. 对红移、投影距离及视向速度差的统计分析表明, 双活动星系核的数量随红移的降低呈增加趋势, 而视向速度差则主要分布在\Delta v \lt 400 km/s; 潮汐样本数量在较大投影距离处较少, 在(60-65) h^-1_70 \; \textkpc 区间内仅有1例, 其中无量纲哈勃常数h_70=H_0/70\; \rmkm \cdot \rms^-1\cdot \rmMpc^-1. 随着投影距离减小, 潮汐样本数量呈增加趋势, 并在(10-15) h^-1_70 \; \textkpc区间内达到峰值(10例), 随后逐渐减少.

     

    Abstract: Research on dual AGNs (Active Galactic Nuclei) is crucial for understanding the formation, growth, and evolution of galaxies and supermassive black holes (SMBHs). However, the current number of identified dual AGNs remains scarce, which limits our understanding of galaxy mergers, the growth of SMBH pairs, and the prediction and detection of low-frequency gravitational waves. A total of 187 new dual AGNs, 4 triple AGN systems, and 1 quadruple AGN system were identified based on the Million Quasars Catalog. All of these multiple AGN systems have low redshifts (z < 0.5), with projected distance (r_\rm p) between members less than 100 kpc and line-of-sight velocity differences (\Delta v) smaller than 600 km/s. This sample complements existing low-redshift dual AGN samples and provides valuable insights into AGN triggering mechanisms and the evolution of SMBH pairs. A visual inspection of the optical and infrared images of the identified samples reveals that approximately 24% of the dual AGN systems exhibit clear tidal features. Statistical analysis of their redshift, projected distance, and line-of-sight velocity difference indicates that the number of dual AGN increases with decreasing redshift, and that most \Delta v values are distributed below 400 km/s. The number of dual AGN systems with tidal features is relatively small in larger projected distances, with only one system found in (60-65) h^-1_70 \; \textkpc . As the projected separation decreases, the number of such systems increases, reaching a peak of 10 cases in (10-15) h^-1_70 \; \textkpc , and then gradually decreases in smaller scales.

     

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