Narrow, intrinsic C iv absorption in quasars as it relates to outflows, orientation, and radio properties

Stone, Robert B.; Richards, Gordon T.

doi:10.1093/mnras/stz2111

Title: Narrow, intrinsic C iv absorption in quasars as it relates to outflows, orientation, and radio properties

Journal Article · 04 August 2019 · Monthly Notices of the Royal Astronomical Society

DOI: https://doi.org/10.1093/mnras/stz2111 · OSTI ID:1557916

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Department of Physics, Drexel University, 32 S. 32nd Street, Philadelphia, PA 19104, USA

Abstract This work provides evidence that a large fraction of C iv narrow absorption lines (NALs) seen along the line of sight to distant quasars are due to accretion disc winds, while also seeking to understand the relationship between NALs and certain quasar-intrinsic properties. We extend the results from past work in the literature using $${\sim}105\, 000$$ NALs from a sample of $${\sim}58\, 000$$ SDSS quasars. The primary results of this work are summarized as follows: (1) the velocity distribution (dN/dβ) of NALs is not a function of radio loudness (or even detection) once marginalized by optical/UV luminosity; (2) there are significant differences in the number and distribution of NALs as a function of both radio spectral index and optical/UV luminosity, and these two findings are not entirely interdependent; (3) improvements in quasar systemic redshift measurements and differences in the NAL distribution as a combined function of optical luminosity and radio spectral index together provide evidence that a significant portion of NALs are due to outflows; (4) the results are consistent with standard models of accretion disc winds governed by the LUV–αox relationship and line-of-sight orientation indicated by radio spectral index, and (5) possibly support a magnetically arrested disc model as an explanation for the semistochastic nature of strong radio emission in a fraction of quasars.

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Sponsoring Organization:: USDOE

OSTI ID:: 1557916

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 4 Vol. 488; ISSN 0035-8711

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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