一个类星体在红移2处脱落它的尘埃茧
A quasar shedding its dust cocoon at redshift 2
摘要：
我们提出了第一个近红外光谱和联合分析的多波长观测SDSS J082747.14+425241.1，尘埃变红，弱宽发射线类星体（WLQ）经历了显着的宽吸收线（BAL）的转变。与文献中使用\mgii \的$z=2.040\pm0.003$相比，使用H $β$更精确地测量系统红移为$z=2.070\pm0.001$，表明相对于H $β$，$2140\pm530$ \kms \的\mgii \发生了极端蓝移。利用基于H $β$的单历元标度关系（系统不确定度为0.3 dex），估计其黑洞质量和爱丁顿比分别为$M_{\rm BH}\sim6.1\times10^8M_\odot$和$λ_{\rm Edd}\sim0.71$，表明其正处于快速吸积阶段.我们的研究证实了WLQ性质和LoBAL $\rightarrow$ HiBAL转化，以及\mgii + \feii \发射强度在20年内增加2倍，$E(B-V)$降低0.1倍。这LoBAL风在$R\sim$ 15 pc从它的BH的动力学功率估计是$\sim$ 43\%的爱丁顿光度，足够的类星体反馈到它的宿主星系，虽然与数量级的不确定性。这个类星体提供了一个明确的例子，证明了长期以来一直在寻找的情况，即LoBAL类星体被尘埃茧包围，广角核风在红色类星体演变为常见的蓝色类星体的过渡中起着关键作用。
英文摘要：
We present the first near-IR spectroscopy and joint analyses of multi-wavelength observations for SDSS J082747.14+425241.1, a dust-reddened, weak broad emission-line quasar (WLQ) undergoing a remarkable broad absorption line (BAL) transformation. The systemic redshift is more precisely measured to be $z=2.070\pm0.001$ using H$β$ compared to $z=2.040\pm0.003$ using \mgii\ from the literature, signifying an extreme \mgii\ blueshift of $2140\pm530$ \kms\ relative to H$β$. Using the H$β$-based single-epoch scaling relation with a systematic uncertainty of 0.3 dex, its black hole (BH) mass and Eddington ratio are estimated to be $M_{\rm BH}\sim6.1\times10^8M_\odot$ and $λ_{\rm Edd}\sim0.71$, indicative of being in a rapidly accreting phase. Our investigations confirm the WLQ nature and the LoBAL$\rightarrow$HiBAL transformation, along with a factor of 2 increase in the \mgii+\feii\ emission strength and a decrease of 0.1 in $E(B-V)$ over two decades. The kinetic power of this LoBAL wind at $R\sim$15 pc from its BH is estimated to be $\sim$43\% of the Eddington luminosity, sufficient for quasar feedback upon its host galaxy albeit with an order-of-magnitude uncertainty. This quasar provides a clear example of the long-sought scenario where LoBAL quasars are surrounded by dust cocoons, and wide-angle nuclear winds play a key role in the transition for red quasars evolving into the commonly seen blue quasars.
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