在0 <z <3.5时对中红外选择的强射电亮AGN的MALS SALT-NOT勘测
MALS SALT-NOT survey of MIR-selected powerful radio-bright AGN at 0<z<3.5
摘要：
我们目前的光学光谱调查的结果，使用盐，而不是建立一个明智的中红外颜色为基础的，尘埃无偏样本的强大的无线电明亮（$>$ 200 mJy在1.4 GHz）AGN的MeerKAT吸收线调查（MALS）。我们的样品有250个活动星系核（中位数PDMATHAMN）显示发射线，26个没有发射线，27个没有光学对应物。总的来说，我们的样本比射电选择类星体更暗（$Δi$ = 0.6等）和更红（$Δ(g-i)$ = 0.2等），代表了光学巡天中检测到的更暗的类星体。大约20%的源是窄线活动星系核（NLAGN）$-$，其中65%在$z < 0.5$是没有强核发射的星系，10%在$z>1.9$有类似于射电星系的发射线比。我们的样本中最远的NLAGN是M1513 $-$ 2524（$z_{em}=3.132$），最大的（$\sim$ 330 kpc）是M0909 $-$ 3133（$z_{em}=0.884$）。我们详细讨论了$1.9 < z < 3.5$上的110活动星系核。尽管它们是射电最强的类星体（$R$中值为3685），但它们的爱丁顿比与$R$较低的SDSS类星体相似。我们检测到4个CIV BALQSO，所有活动星系核中的$R$最少，最高的黑洞质量和爱丁顿比。BAL探测率（$4^{+3}_{-2}$ %）与极强（$L_{1.4GHz}>10^{25}$ WHz $^{-1}$）类星体中的探测率一致。利用光学光变曲线、射电偏振和$γ$-射线探测，我们确定了7个高概率BL Lac。我们还总结了完整的MALS足迹在$z<2$搜索HI 21-cm和OH 18-cm线。
英文摘要：
We present results of an optical spectroscopic survey using SALT and NOT to build a WISE mid-infrared color-based, dust-unbiased sample of powerful radio-bright ($>$200 mJy at 1.4 GHz) AGN for the MeerKAT Absorption Line Survey (MALS). Our sample has 250 AGN (median $z=1.8$) showing emission lines, 26 with no emission lines, and 27 without optical counterparts. Overall, our sample is fainter ($Δi$=0.6 mag) and redder ($Δ(g-i)$=0.2 mag) than radio-selected quasars, and representative of fainter quasar population detected in optical surveys. About 20% of the sources are narrow line AGN (NLAGN) $-$ 65% of these, at $z < 0.5$ are galaxies without strong nuclear emission, and 10% at $z>1.9$, have emission line ratios similar to radio galaxies. The farthest NLAGN in our sample is M1513$-$2524 ($z_{em}=3.132$), and the largest (size$\sim$330 kpc) is M0909$-$3133 ($z_{em}=0.884$). We discuss in detail 110 AGN at $1.9 < z < 3.5$. Despite representing the radio loudest quasars (median $R$=3685), their Eddington ratios are similar to the SDSS quasars having lower $R$. We detect 4 CIV BALQSOs, all among AGN with least $R$, and highest black hole masses and Eddington ratios. The BAL detection rate ($4^{+3}_{-2}$%) is consistent with that seen in extremely powerful ($L_{1.4GHz}>10^{25}$ WHz$^{-1}$) quasars. Using optical light-curves, radio polarization and $γ$-ray detections, we identify 7 high-probability BL Lacs. We also summarize the full MALS footprint to search for HI 21-cm and OH 18-cm lines at $z<2$.
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