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Merging and Clustering of the Swift BAT AGN Sample
Cosmology and Nongalactic Astrophysics · Submitted 1 Jun 2010
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We find a higher incidence of galaxies with signs of disruption compared to a matched control sample (18% versus 1%) and of close pairs within 30 kpc (24% versus 1%).
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The abstract, sentence by sentence
We discuss the merger rate, close galaxy environment, and clustering on scales up to a Mpc of the SWIFT BAT hard X-ray sample of nearby (z<0.05), moderate-luminosity active galactic nuclei (AGN). We find a higher incidence of galaxies with signs of disruption compared to a matched control sample (18% versus 1%) and of close pairs within 30 kpc (24% versus 1%). We also find a larger fraction with companions compared to normal galaxies and optical emission line selected AGN at scales up to 250 kpc. We hypothesize that these merging AGN may not be identified using optical emission line diagnostics because of optical extinction and dilution by star formation. In support of this hypothesis, in merging systems we find a higher hard X-ray to [OIII] flux ratio, as well as emission line diagnostics characteristic of composite or star-forming galaxies, and a larger IRAS 60 um to stellar mass ratio.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We discuss the merger rate, close galaxy environment, and clustering on scales up to a Mpc of the SWIFT BAT hard X-ray sample of nearby (z<0.05), moderate-luminosity active galactic nuclei (AGN). | contribution 1.00 | 0.68 | 0.07 | unclear 0.79 |
| s1 | We find a higher incidence of galaxies with signs of disruption compared to a matched control sample (18% versus 1%) and of close pairs within 30 kpc (24% versus 1%). | result 1.00 | 0.97 | 0.41 | asserted 1.00 |
| s2 | We also find a larger fraction with companions compared to normal galaxies and optical emission line selected AGN at scales up to 250 kpc. | result 1.00 | 0.95 | 0.17 | asserted 1.00 |
| s3 | We hypothesize that these merging AGN may not be identified using optical emission line diagnostics because of optical extinction and dilution by star formation. | interpretation 1.00 | 0.10 | 0.12 | hedged possibility 0.94 |
| s4 | In support of this hypothesis, in merging systems we find a higher hard X-ray to [OIII] flux ratio, as well as emission line diagnostics characteristic of composite or star-forming galaxies, and a larger IRAS 60 um to stellar mass ratio. | result 0.85 | 0.95 | 0.15 | asserted 0.96 |
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The paper
Original abstract
We discuss the merger rate, close galaxy environment, and clustering on scales up to a Mpc of the SWIFT BAT hard X-ray sample of nearby (z<0.05), moderate-luminosity active galactic nuclei (AGN). We find a higher incidence of galaxies with signs of disruption compared to a matched control sample (18% versus 1%) and of close pairs within 30 kpc (24% versus 1%). We also find a larger fraction with companions compared to normal galaxies and optical emission line selected AGN at scales up to 250 kpc. We hypothesize that these merging AGN may not be identified using optical emission line diagnostics because of optical extinction and dilution by star formation. In support of this hypothesis, in merging systems we find a higher hard X-ray to [OIII] flux ratio, as well as emission line diagnostics characteristic of composite or star-forming galaxies, and a larger IRAS 60 um to stellar mass ratio.
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References
How later papers used it
47 later papers cite it
1 later paper by other authors is listed below: 1 cited it as support. 1 more paper by the same authors is listed: 1 used its method or tool.
Uses its method or tool 1 paper · 1 by the same authors
By the same authors
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Defined mergers in the same way as this paper and another work, requiring a projected distance of at most 30 kpc and a radial velocity difference of <500 km s^-1 between the galaxy and its companion.
Decreased Specific Star Formation Rates in AGN Host Galaxies (2015) (same authors) · 0.99 · paraphrased: the licence does not allow quoting
Cites it as support 1 of 6 papers with this label
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Argued that emission line dilution from star formation precludes optical AGN classification at lower AGN luminosities, a result also supported by this paper.
The X-ray View of Merger-Induced AGN Activity at Low Redshift (2020) · 0.99 · paraphrased: the licence does not allow quoting
How the literature uses it
1 arXiv paper cite this in 1 sentence
Papers citing it
Cites it as support 1 paper
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Observationally, post-mergers host a significantly higher fraction of mid-IR-selected AGNs than optical AGNs, suggesting that optically obscured AGNs become prevalent following mergers [ref] .
A Rare Eddington-Limited, Heavily Obscured Low-Mass Active Galactic Nucleus Likely Triggered by a Galaxy Merger · A Physical Scenario under the Merger-driven Framework · 0.99
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