A Study of Outflows in Luminous Quasars at Redshift $\sim0.4-0.8$

J. Wang; D. W. Xu; J. Y. Wei

doi:10.3847/1538-4357/aa9d1b

paper

A Study of Outflows in Luminous Quasars at Redshift $\sim 0.4 - 0.8$

arXiv:1711.09775 · doi:10.3847/1538-4357/aa9d1b

Abstract

We perform a systematic study of outflow in the narrow-line region (NLR) of active galactic nuclei (AGNs) at $z \sim 0.4 - 0.8$ basing upon a large sample of $\sim 900$ quasars at $z \sim 0.4 - 0.8$ . The sample is extracted from the Sloan Digital Sky Survey by mainly requiring 1) the g-band magnitude is brighter than 19 magnitude; and 2) the [OIII] $λ 5007$ emission line has a signal-to-noise ration larger than 30. Profiles of multiple emission lines are modeled by a sum of several Gaussian functions. The spectral analysis allows us to identify 1) a prevalence of both [OIII] $λ 5007$ line blue asymmetry and bulk velocity blueshift of both [NeIII] $λ 3869$ and [NeV] $λ 3426$ lines, when the [\ion{O}{2}] $λ 3727$ line is used as a reference. The velocity offset of [\ion{O}{3}] $λ 5007$ line is, however, distributed around zero value, except for a few outliers. 2) not only the significant [OIII] $λ 5007$ line asymmetry, but also the large bulk velocity offsets of [NeIII] $λ 3869$ and [NeV] $λ 3426$ emission lines tend to occur in the objects with high $L / L_{Edd}$ , which is considerably consistent with the conclusions based on local AGNs. With three $M_{BH}$ estimation methods, the significance level of the trend is found to be better than $2.9 σ$ , $3.2 σ$ and $1.8 σ$ for [OIII], [NeIII] and [NeV], respectively. \rm After excluding the role of radio jets, the revealed dependence of NLR gas outflow on $L / L_{Edd}$ allows us to argue that the pressure caused by the wind/radiation launched/emitted from central supermassive black hole is the most likely origin of the outflow in these distant quasars, which implies that the outflow in luminous AGNs up to $z \sim 1$ have the same origin.

arXiv comment17 pages, 8 figures, and 2 tables. To be published in ApJ. arXiv admin note: text overlap with arXiv:1512.01920

A Study of Outflows in Luminous Quasars at Redshift $\sim 0.4 - 0.8$

Abstract

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A Study of Outflows in Luminous Quasars at Redshift ∼0.4−0.8

Abstract

References in corpus (111)

Cited by in corpus (18)

A Study of Outflows in Luminous Quasars at Redshift $\sim 0.4 - 0.8$