论文标题
一个类星体在Redshift 2上脱落了尘埃茧2
A quasar shedding its dust cocoon at redshift 2
论文作者
论文摘要
我们介绍了SDSS的多波长观测值的第一个近IR光谱和关节分析，该SDSS J082747.14+425241.1，一种尘埃降低的，弱的，弱的宽发射线Quasar（WLQ），经历了一个明显的宽吸收线（BAL）转换。 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$β$.使用基于H $β$的单位缩放关系，系统不确定性为0.3 DEX，其黑洞（BH）质量和Eddington比率估计为$ M _ {\ rm BH} \ sim6.1 \ sim6.1 \ times10^8m_ \ odot $ and od od $ _ odot $ and $λ_ {$ sim a sim a sim a sim a sim a sim a sim as a sim a sim as a sim as a sim as a sim as a sim as a sim as a sim as a sim as a sim as a sim as a sim as a sim。积累阶段。我们的调查证实了WLQ的性质和Lobal $ \ rightarrow $ hibal变换，以及\ mgii+\ feii \排放强度增加了2倍，并且在$ E（B-V）$中降低了0.1。据估计，这种Lobal风在$ r \ sim $ 15 pc的动力能力估计为$ \ sim $ 43 \％的爱丁顿光度，足以在其主机银河系上进行Quasar反馈，即该类星体提供了一个清晰的例子，说明了长期的类星体被尘埃茧包围，广角核风风在红色类星体演变成常见的蓝色类星体的过渡中起着关键作用。
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.
