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UV line driven disc wind as the origin of ultrafast outflows in AGN

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Misaki Mizumoto, Mariko Nomura, Chris Done, Ken Ohsuga, Hirokazu Odaka

High Energy Astrophysical Phenomena · Submitted 2 Mar 2020

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim This directly demonstrates that UV line driving is a viable mechanism to launch even the fastest UFOs.

how it is stated · asserted 1.00 read the record →

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arXiv ID2003.01137 (version 2)
Pith IDQRZDJ3PQ, Pith's permanent record of this paper and its review
CitationChris Done, Hirokazu Odaka, Ken Ohsuga, Mariko Nomura, Misaki Mizumoto. "UV line driven disc wind as the origin of ultrafast outflows in AGN." arXiv:2003.01137 (2020). https://pith.science/paper/QRZDJ3PQ
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The compiled record

The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.

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Compiled by classifier-1.13.0 via TypeSafe API, question bank abstract-p1-20260923, 2026-09-23: 1 request, 7,619 input tokens.

What the abstract itself states, as probabilities: claims first 0.05 · states limitation 0.45 · human participants 0.01 · controlled comparison 0.05 · randomized assignment 0.01 · states quantitative result 0.09 · compares with prior results 0.25 · mentions code or data availability 0.03.

The abstract, sentence by sentence

arXiv listing abstract v2. Results and the main claim are underlined; .

UltraFast Outflows (UFO) are observed in some active galactic nuclei (AGN), with blueshifted and highly ionised Fe-K absorption features. AGN typically have a UV bright accretion flow, so UV line driving is an obvious candidate for launching these winds. However this mechanism requires material with UV opacity, in apparent conflict with the observed high ionisation state of the wind. In this paper we synthesise the X-ray energy spectra resulting from different lines of sight through a state of the art radiation hydrodynamics UV line driven disc wind simulation. We demonstrate that there are some lines of sight which only intercept highly ionised and fast outflowing material. The cooler material required for the UV line driving acceleration is out of the line of sight, close to the disc, shielded from the X-rays by a failed wind. We fit these simulated wind spectra to data from the archetypal UFO source PG 1211+143 and show that they broadly reproduce the depth and velocity of the iron absorption lines seen. This directly demonstrates that UV line driving is a viable mechanism to launch even the fastest UFOs. We simulate microcalorimeter observations of this wind and show that their high energy resolution can resolve the detailed structure in the wind and recover the wind energetics when combined with models which correctly estimate the line formation radius of the wind. New data from microcalorimeters will pave the way for physical predictions of AGN wind feedback in cosmological simulations.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#sentencerolethe authors' own workstates the main conclusionstrength
s0 UltraFast Outflows (UFO) are observed in some active galactic nuclei (AGN), with blueshifted and highly ionised Fe-K absorption features. background 1.00 0.08 0.01 asserted 1.00
s1 AGN typically have a UV bright accretion flow, so UV line driving is an obvious candidate for launching these winds. background 1.00 0.05 0.02 hedged possibility 0.60
s2 However this mechanism requires material with UV opacity, in apparent conflict with the observed high ionisation state of the wind. gap 0.54 0.07 0.02 asserted 0.97
s3 In this paper we synthesise the X-ray energy spectra resulting from different lines of sight through a state of the art radiation hydrodynamics UV line driven disc wind simulation. method 0.75 0.95 0.03 asserted 0.87
s4 We demonstrate that there are some lines of sight which only intercept highly ionised and fast outflowing material. result 1.00 0.94 0.11 asserted 1.00
s5 The cooler material required for the UV line driving acceleration is out of the line of sight, close to the disc, shielded from the X-rays by a failed wind. result 0.71 0.77 0.07 asserted 1.00
s6 We fit these simulated wind spectra to data from the archetypal UFO source PG 1211+143 and show that they broadly reproduce the depth and velocity of the iron absorption lines seen. result 0.93 0.96 0.09 asserted 0.92
s7 This directly demonstrates that UV line driving is a viable mechanism to launch even the fastest UFOs. interpretation 0.96 0.90 0.90 asserted 1.00
s8 We simulate microcalorimeter observations of this wind and show that their high energy resolution can resolve the detailed structure in the wind and recover the wind energetics when combined with models which correctly estimate the line formation radius of the wind. result 0.56 0.96 0.05 asserted 1.00
s9 New data from microcalorimeters will pave the way for physical predictions of AGN wind feedback in cosmological simulations. future work 0.92 0.10 0.03 hedged possibility 0.63

What kind of paper the classifier reports this is: simulation study 1.00 · evidence from simulation or computation 1.00.

What was examined, and what was not

sources read
  • arXiv listing abstract v2
not examined
  • full text
  • figures and tables
  • references and citing sentences
  • relations to other papers
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not run
  • S sections
  • T body sentences
  • C citations
  • R cross-paper relations

Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

The paper
Original abstract

UltraFast Outflows (UFO) are observed in some active galactic nuclei (AGN), with blueshifted and highly ionised Fe-K absorption features. AGN typically have a UV bright accretion flow, so UV line driving is an obvious candidate for launching these winds. However this mechanism requires material with UV opacity, in apparent conflict with the observed high ionisation state of the wind. In this paper we synthesise the X-ray energy spectra resulting from different lines of sight through a state of the art radiation hydrodynamics UV line driven disc wind simulation. We demonstrate that there are some lines of sight which only intercept highly ionised and fast outflowing material. The cooler material required for the UV line driving acceleration is out of the line of sight, close to the disc, shielded from the X-rays by a failed wind. We fit these simulated wind spectra to data from the archetypal UFO source PG 1211+143 and show that they broadly reproduce the depth and velocity of the iron absorption lines seen. This directly demonstrates that UV line driving is a viable mechanism to launch even the fastest UFOs. We simulate microcalorimeter observations of this wind and show that their high energy resolution can resolve the detailed structure in the wind and recover the wind energetics when combined with models which correctly estimate the line formation radius of the wind. New data from microcalorimeters will pave the way for physical predictions of AGN wind feedback in cosmological simulations.

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References
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6 arXiv papers cite this in 8 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers citing it · 7 sentences without a confident label

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