The origin and physical mechanism of the ensemble Baldwin effect
Xiaobo Dong (1), Jianguo Wang (2, 1), Tinggui Wang (1), Huiyuan, Wang (1), Xiaohui Fan (3), Hongyan Zhou (1), Weimin Yuan (2), Qian Long (4), ((1) USTC/CfA, China, (2) Yunnan Observatory, China, (3) Steward Observatory,, (4) USTC/PMPI, China)
TL;DR
This paper investigates the physical origin of the Baldwin effect in AGNs, revealing that the Eddington ratio governs emission-line correlations by influencing cloud properties in the line-emitting regions.
Contribution
It identifies the Eddington ratio as the fundamental driver of emission-line regularities in AGNs, providing a physical explanation for the Baldwin effect.
Findings
Eddington ratio (L/Ledd) is the key factor behind emission-line correlations.
The physics involves L/Ledd regulating cloud properties like column density.
The study uses a homogeneous SDSS DR4 sample of Seyfert 1s and QSOs.
Abstract
We have conducted a systematic investigation of the origin and underlying physics of the line--line and line--continuum correlations of AGNs, particularly the Baldwin effect. Based on the homogeneous sample of Seyfert 1s and QSOs in the SDSS DR4, we find the origin of all the emission-line regularities is Eddington ratio (L/Ledd). The essential physics is that L/Ledd regulates the distributions of the properties (particularly column density) of the clouds bound in the line-emitting region.
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Taxonomy
TopicsLaser-induced spectroscopy and plasma · Spectroscopy and Laser Applications · Atomic and Molecular Physics