1. A Quasar Shedding Its Dust Cocoon at Redshift 2.
- Author
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Yi, Weimin, Brandt, W. N., Ni, Q., Ho, Luis C., Luo, Bin, Yan, Wei, Schneider, D. P., Paul, Jeremiah D., Plotkin, Richard M., Yang, Jinyi, Wang, Feige, He, Zhicheng, Chen, Chen, Wu, Xue-Bing, and Bai, Jin-Ming
- Subjects
GAMMA ray bursts ,EDDINGTON mass limit ,COCOONS ,DUST ,QUASARS ,REDSHIFT ,BLACK holes ,SUPERMASSIVE black holes - Abstract
We present the first near-IR spectroscopy and joint analyses of multiwavelength 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 ± 0.001 using H β compared to z = 2.040 ± 0.003 using Mg ii from the literature, signifying an extreme Mg ii blueshift of 2140 ± 530 km s
â'1 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 MBH ⼠6.1 Ă— 108 M⊙ and λEdd ⼠0.71, indicative of being in a rapidly accreting phase. Our investigations confirm the WLQ nature and the LoBAL â†' HiBAL transformation, along with a factor of 2 increase in the Mg ii +Fe ii emission strength and a decrease of 0.1 in E (B â' V) over two decades. The kinetic power of this LoBAL wind at R ⼠15 pc from its BH is estimated to be âĽ43% 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 of red quasars evolving into the commonly seen blue quasars. [ABSTRACT FROM AUTHOR]- Published
- 2022
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