拥有极高速度外流的类星体的LOFAR射电性质
LOFAR radio properties of quasars hosting Extremely High Velocity Outflows
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中文总结 AI 辅助
本研究通过交叉匹配SDSS与LoTSS数据，发现拥有极高速度外流的类星体射电探测率显著更高，表明此类高速风可能是射电发射的贡献机制。
中文摘要 AI 辅助
类星体风是所谓的“射电宁静”类星体中观测到的射电发射的潜在贡献者。极高速度外流（EHVOs），其体速度大于0.1c，代表了这些风中最具能量的一部分。在本工作中，我们研究了拥有EHVOs的类星体的射电性质，以评估这种高速风是否对观测到的射电发射有所贡献。我们将斯隆数字巡天中的EHVOs星表与高灵敏度低频阵列（LOFAR）两米巡天（LoTSS）第三批数据进行了交叉匹配。我们发现，EHVO类星体表现出显著更高的射电探测率，为38%，而底层母类星体族群的射电探测率为24%。通过使用最近邻匹配构建控制样本，我们表明仅匹配C IV发射线蓝移就足以在整体意义上重现升高的射电探测率；然而，在EHVO分布与任何匹配样本之间，射电探测率随C IV发射蓝移的变化仍存在差异，这表明有某种额外的机制在起作用。此外，复合光谱显示，在射电探测到和未探测到的EHVOs之间，紫外吸收轮廓没有显著差异，尽管我们发现了最大外流速度与射电光度之间存在轻微的正相关。我们的结果表明，EHVOs可能代表了类星体中拥有快速风的一个子集，这些风沿特定视线方向被观测到，并且与这种风相关的射电发射仍然是一个合理的机制。
英文摘要
Quasar winds are a potential contributor to the radio emission observed in the so-called 'radio-quiet' quasars. Extremely High Velocity Outflows (EHVOs), with bulk velocities >0.1c, represent some of the most energetic of these winds. In this work, we investigate the radio properties of quasars hosting EHVOs in order to assess whether such high-velocity winds contribute to the observed radio emission. We cross-match the catalogue of EHVOs from the Sloan Digital Sky Survey with the high-sensitivity Low-Frequency Array (LOFAR) Two-metre Sky Survey (LoTSS) Data Release 3. We find that EHVO quasars exhibit a significantly higher radio-detection fraction of 38 per cent compared to an underlying parent quasar population at 24 per cent. By constructing control samples using nearest-neighbour matching, we show that matching the C IV emission line blueshift alone is sufficient to reproduce the elevated radio-detection fraction in a global sense; however, differences still remain in the radio-detection fraction as a function of C IV emission blueshift between the EHVO distribution and any matched sample, suggesting that some additional mechanism is at play. Furthermore, composite spectra reveal no significant differences in the ultraviolet absorption profiles between radio-detected and radio-undetected EHVOs, although we identify a mild positive correlation between maximum outflow velocity and radio luminosity. Our results suggest that EHVOs likely represent a subset of the quasars which host fast winds that are observed along particular lines-of-sight, and that radio emission associated with such winds remains a plausible mechanism.
发表机构
- Institute for Astronomy, University of Edinburgh（爱丁堡大学天体物理研究所）
- University of Washington Bothell（华盛顿大学博瑟尔分校）
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