Pith. sign in

REVIEW 4 cited by

High Density Reflection Spectroscopy: II. the Density of the Inner Black Hole Accretion Disc in AGN

Not yet reviewed by Pith; the record is open.

Re-run · record.json Download PDF Read on arXiv ↗

This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.

SPECIMEN: schema-true, not a live event

T0 review · schema-true

One-sentence machine reading of the paper's core claim.

pith:XXXXXXXX · record.json · timestamp

arxiv 1908.07272 v2 pith:M42GVARQ submitted 2019-08-20 astro-ph.HE

Jiachen Jiang , Andrew C. Fabian , Thomas Dauser , Luigi Gallo , Javier A. Garcia , Erin Kara , Michael L. Parker , John A. Tomsick
show 2 more authors
Dominic J. Walton Christopher S. Reynolds
This is my paper · ORCID
classification astro-ph.HE
keywords discdensityaccretionblackholehighmassreflection
verification ladder T0 review T1 audit T2 compute T3 formal
0 comments
read the original abstract

We present a high density disc reflection spectral analysis of a sample of 17 Seyfert 1 galaxies to study the inner disc densities at different black hole mass scales and accretion rates. All the available XMM-Newton observations in the archive are used. OM observations in the optical/UV band are used to estimate their accretion rates. We find that 65% of sources in our sample show a disc density significantly higher than 1e15 cm^{-3}, which was assumed in previous reflection-based spectral analyses. The best-fit disc densities show an anti-correlation with black hole mass and mass accretion rate. High density disc reflection model can successfully explain the soft excess emission and significantly reduce inferred iron abundances. We also compare our black hole spin and disc inclination angle measurements with previous analyses.

Discussion (0). Continue with ORCID to comment.

Forward citations

Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. First detection of ultra-fast outflows in a quiescent galaxy

    astro-ph.GA 2026-07 conditional novelty 7.0 of 10

    First detection of an ultra-fast outflow (v≈0.07c) in a quiescent galaxy quenched ~9 Gyr ago, suggesting AGN winds can maintain quiescence independent of global star formation.

  2. Black-Hole Spin Measurements from X-ray Reflection Spectroscopy: Quality Criteria and Community Recommendations

    astro-ph.HE 2026-07 conditional novelty 5.0 of 10

    Reflection-based black-hole spin measurements should be graded by detectability, uniqueness, and robustness, and classified into high-confidence, systematics-limited, provisional, or non-assessable tiers.

  3. Neutrino-Induced Polarization Rotation in Active Galactic Nuclei Plasmas

    hep-ph 2026-01 conditional novelty 5.0 of 10

    Neutrino-induced polarization rotation in AGN plasmas is computed and found to produce a frequency scaling distinct from Faraday rotation, but with angles far below current polarimetric sensitivity.

  4. Neutrino spin oscillations near a black hole

    hep-ph 2025-02 conditional novelty 5.0 of 10

    Neutrinos scattered by a black hole's accretion disk undergo non-negligible spin flip from the toroidal magnetic field alone, contrary to earlier studies.

Pith tools