Connecting radio emission to AGN wind properties with broad absorption line quasars
Connecting radio emission to AGN wind properties with broad absorption line quasars
复制标题
将无线电发射与具有宽吸收线类星体的 AGN 风特性联系起来
DOI：
10.1093/mnras/stac2067
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发表时间：
2022
影响因子：
4.8
通讯作者：
Petley J
中科院分区：
文献类型：
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作者：
Petley J
宽吸收线类星体（BALQSO）显示出强烈的外流特征，有可能改变其宿主星系的宇宙历史。这些特征只在100%的光学选择类星体中看到，尽管在红外和射电选择样本中这一比例显着增加。对于这个观测到的分数，一个经过验证的物理解释还没有找到，沿着的是为什么这个分数在无线电波长处增加的确定。我们提出了最大的样本的无线电匹配BALQSO使用LOFAR两米巡天数据发布2，并利用它来调查BALQSO的无线电特性。在DR2的覆盖范围内，有3537个来自斯隆数字巡天DR12的BALQSO，连续信噪比≥5。我们发现1108 BALQSO的无线电探测，与一个重要的亚群120 LoBALs，无线电匹配的BALQSO的天空覆盖到目前为止，一个前所未有的样本大小。BALQSO是一种无线电静默种群，与非BALQSO相比，其无线电检测分数增加了×1.50。LoBALs比非BALQSO类星体增加了2.22倍。我们表明，这个检测分数与风强度、变红和BALQSO的民用发射特性相关，并且这些特征可能是相互联系的，尽管没有任何单一的特性可以完全解释增强的无线电检测分数。我们创建复合光谱的BALQSO的子类的基础上风的强度和颜色，发现在吸收曲线的无线电检测和无线电未检测到的来源，特别是LoBALs的差异。总的来说，我们赞成风ISM相互作用的解释增加的无线电探测部分BALQSO。
Broad absorption line quasars (BALQSOs) show strong signatures of powerful outflows, with the potential to alter the cosmic history of their host galaxies. These signatures are only seen in ∼10 per cent of optically selected quasars, although the fraction significantly increases in IR and radio selected samples. A proven physical explanation for this observed fraction has yet to be found, along with a determination of why this fraction increases at radio wavelengths. We present the largest sample of radio matched BALQSOs using the LOFAR Two-metre Sky Survey Data Release 2 and employ it to investigate radio properties of BALQSOs. Within the DR2 footprint, there are 3537 BALQSOs from Sloan Digital Sky Survey DR12 with continuum signal-to-noise ≥5. We find radio-detections for 1108 BALQSOs, with an important subpopulation of 120 LoBALs, an unprecedented sample size for radio matched BALQSOs given the sky coverage to date. BALQSOs are a radio-quiet population that show an increase of ×1.50 radio-detection fraction compared to non-BALQSOs. LoBALs show an increase of ×2.22 that of non-BALQSO quasars. We show that this detection fraction correlates with wind-strength, reddening, and Civemission properties of BALQSOs and that these features may be connected, although no single property can fully explain the enhanced radio detection fraction. We create composite spectra for subclasses of BALQSOs based on wind strength and colour, finding differences in the absorption profiles of radio-detected and radio-undetected sources, particularly for LoBALs. Overall, we favour a wind-ISM interaction explanation for the increased radio-detection fraction of BALQSOs.