Kavli Affiliate: Luis C. Ho
| First 5 Authors: Weimin Yi, W. N. Brandt, Q. Ni, Luis C. Ho, Bin Luo
| Summary:
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 $z=2.070pm0.001$ using H$beta$ compared to $z=2.040pm0.003$ using mgii
from the literature, signifying an extreme mgii blueshift of $2140pm530$
kms relative to H$beta$. Using the H$beta$-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 $M_{rm BH}sim6.1times10^8M_odot$ and
$lambda_{rm Edd}sim0.71$, 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 $Rsim$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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