Far-UV Fe emission as proxy of Eddington ratios

Zheng, Wei

doi:10.1093/mnras/stab1749

Title: Far-UV Fe emission as proxy of Eddington ratios

Journal Article · 23 June 2021 · Monthly Notices of the Royal Astronomical Society

DOI: https://doi.org/10.1093/mnras/stab1749 · OSTI ID:1811100

Zheng, Wei

ABSTRACT The Eddington ratio is a key parameter that governs the diversity of quasar properties. It can be scaled with a strong anticorrelation between optical Fe iiopt and [O iii] emission. In search of such indicators in the far-UV band, the Hubble Space Telescope far-UV spectra of 150 low-redshift quasars are analysed in combination with their optical SDSS counterparts. The strength of Fe ii+Fe iii λ1123 emission is significantly correlated with that of Fe iiopt. A moderate correlation may also exist between Fe ii λ1071 and Fe iiopt. The finding opens the possibility that far-UV Fe ii emission may serve as a new gauge of the Eddington ratios. The high- and low-ionization lines in the far-UV band display different patterns: for the quasars with higher Eddington ratios, the low-ionization UV lines are stronger, and the high-ionization lines are broader and weaker.

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Sponsoring Organization:: USDOE

OSTI ID:: 1811100

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 3 Vol. 506; ISSN 0035-8711

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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