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

被引：12

作者：

Stone, Robert B. ^{[1
]}

Richards, Gordon T. ^{[1
]}

机构：

[1] Drexel Univ, Dept Phys, 32 S 32nd St, Philadelphia, PA 19104 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2019年 / 488卷 / 04期

基金：

美国安德鲁·梅隆基金会; 美国国家航空航天局; 美国国家科学基金会;

关键词：

galaxies: active; quasars: absorption lines; radio continuum: galaxies; DIGITAL-SKY-SURVEY; ACCRETION DISKS; NUMERICAL SIMULATIONS; OPTICAL-PROPERTIES; CIV ABSORPTION; 1ST SURVEY; LINE; WINDS; REDSHIFT; DRIVEN;

D O I：

10.1093/mnras/stz2111

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 similar to 105 000 NALs from a sample of similar to 58 000 SDSS quasars. The primary results of this work are summarized as follows: (1) the velocity distribution (dN/d beta) 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 L-UV-alpha(ox) 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.

引用

页码：5916 / 5934

页数：19

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