Long-term X-ray variability of the NLS1 Ark 564

arXiv:2609.30793 · astro-ph.HE · Submitted 2026-09-25 · Read on arXiv

astro-ph.HE

Submitted: 2026-09-25

Updated: 2026-09-25

Terminology

• AGN — 17× in this paper · explained in 1 episode
• Abundance — 2× in this paper · explained in 1 episode
• Accretion Flows — 1× in this paper · explained in 1 episode
• Active Galactic Nucleus — 1× in this paper
• Calibration — 1× in this paper · explained in 7 episodes
• Consistency — 1× in this paper · explained in 3 episodes
• Velocity Dispersion — 1× in this paper · explained in 2 episodes

Sources

• Long term X-ray spectral variations of the Seyfert-1 galaxy Mrk 279
• Modelling the energy dependent X-ray variability of Mrk 335
• NuSTAR observation of Ark 564 reveals the variation of coronal temperature with flux
• CAIXA: a Catalogue of AGN In the XMM-Newton Archive I. Spectral analysis
• Soft X-ray properties of "narrow-line" Seyfert 1 galaxies
• ROSAT PSPC Observations of the Seyfert 1 Galaxies Ark 564, NGC 985, Kaz 163, MRK 79 and RX J 2256.6+0525
• Spectral variability analysis of an XMM-Newton observation of Ark 564
• The Swift X-ray Telescope
• An Explanation for the soft X-ray excess in AGN
• The role of the reflection fraction in constraining black hole spin
• Discovery of a relation between black hole mass and soft X-ray time lags in active galactic nuclei
• An investigation of the origin of soft X-ray excess emission from Narrow-line Seyfert 1 galaxies Akn564 and Mrk1044
• Intrinsic disc emission and the Soft X-ray Excess in AGN
• X-ray Spectral Variability and Rapid Variability of the Soft X-ray Spectrum Seyfert 1 Galaxies Ark 564 and Ton S180
• UV and X-Ray Variability of the Narrow-Line Seyfert 1 Galaxy Ark 564
• Determining the torus covering factors for a sample of type 1 AGN in the local Universe
• Correlation between relativistic reflection fraction and photon index in NuSTAR sample of Seyfert 1 AGN
• AstroSat view of the NLS1 galaxy Mrk 335
• A long hard look at MCG-6-30-15 with XMM-Newton
• On the determination of the spin and disc truncation of accreting black holes using X-ray reflection

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