The WISE-2MASS Survey: Red Quasars Into the Radio Quiet Regime
The WISE-2MASS Survey: Red Quasars Into the Radio Quiet Regime
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DOI：
10.3847/1538-4357/ac6bee
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发表时间：
2022-04
期刊：
影响因子：
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通讯作者：
E. Glikman;M. Lacy;S. LaMassa;C. Bradley;S. Djorgovski;T. Urrutia;E. Gates;M. Graham;M. Urry;I. Yoon
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文献类型：
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作者：
E. Glikman;M. Lacy;S. LaMassa;C. Bradley;S. Djorgovski;T. Urrutia;E. Gates;M. Graham;M. Urry;I. Yoon
我们提出了一个高度完整的宽线（1型）qso样本，通过它们的中红外颜色选择z ~ 3，这种方法受尘埃变红的影响最小。我们从光谱中去除宿主星系发射，并拟合剩余qso的过度变红，从而得到未变红的（蓝色）qso的颜色呈高斯分布，尾巴向重变红的（红色）qso延伸，定义为E(B−V) > 0.25。这种与无线电无关的选择方法使我们能够在FIRST （1.4 GHz）和VLASS （2-4 GHz）调查中比较红色和蓝色QSO无线电特性。与SDSS光学选择qso的最新结果一致，我们发现红色qso在两个频率下都具有更高的检测分数和更高的紧凑无线电形态学分数。我们采用射电叠加的方法研究了qso的中位数射电特性，包括那些在FIRST和VLASS中未被检测到的qso，发现与蓝色qso相比，红色qso的射电发射明显更亮，射电光谱斜率更陡。最后，我们发现红色qso的发生率与亮度密切相关，在最高光度下，红色qso占所有qso的40%。总的来说，红色qso占高光度qso的40%，在低光度下下降到只有几个百分点。此外，红色QSO在无线电检测到的QSO种群中所占比例较大。我们认为，尘埃飞扬的agn驱动的风是造成遮蔽以及在红色qso中看到的过量无线电发射的原因。
We present a highly complete sample of broad-line (Type 1) QSOs out to z ∼ 3 selected by their mid-infrared colors, a method that is minimally affected by dust reddening. We remove host-galaxy emission from the spectra and fit for excess reddening in the residual QSOs, resulting in a Gaussian distribution of colors for unreddened (blue) QSOs, with a tail extending toward heavily reddened (red) QSOs, defined as having E(B − V) > 0.25. This radio-independent selection method enables us to compare red and blue QSO radio properties in both the FIRST (1.4 GHz) and VLASS (2–4 GHz) surveys. Consistent with recent results from optically selected QSOs from SDSS, we find that red QSOs have a significantly higher detection fraction and a higher fraction of compact radio morphologies at both frequencies. We employ radio stacking to investigate the median radio properties of the QSOs including those that are undetected in FIRST and VLASS, finding that red QSOs have significantly brighter radio emission and steeper radio spectral slopes compared with blue QSOs. Finally, we find that the incidence of red QSOs is strongly luminosity dependent, where red QSOs make up >40% of all QSOs at the highest luminosities. Overall, red QSOs comprise ∼40% of higher luminosity QSOs, dropping to only a few percent at lower luminosities. Furthermore, red QSOs make up a larger percentage of the radio-detected QSO population. We argue that dusty AGN-driven winds are responsible for both the obscuration as well as excess radio emission seen in red QSOs.