A break in the X-ray loudness of Markarian 590: evidence for an AGN spectral state transition?

arXiv:2602.17572 · astro-ph.HE, astro-ph.GA · Submitted 2026-02-19 · Read on arXiv

astro-ph.HE, astro-ph.GA

Submitted: 2026-02-19

Updated: 2026-09-01

Code: https://github.com/kbarbary/sfdmap

Terminology

• AGN — 50× in this paper · explained in 1 episode
• Trace — 10× in this paper · explained in 2 episodes
• Accretion Physics — 3× in this paper · explained in 2 episodes
• Consistency — 2× in this paper · explained in 3 episodes
• Core — 2× in this paper · explained in 2 episodes
• Aperture — 1× in this paper · explained in 1 episode
• Aperture Photometry — 1× in this paper · explained in 1 episode
• Calibration — 1× in this paper · explained in 7 episodes
• Giant Meterwave Radio Telescope — 1× in this paper
• Robustness — 1× in this paper · explained in 5 episodes
• Variables and Slow Transients — 1× in this paper
• Very Large Array — 1× in this paper

Sources

• Discovery of Repeating Transitions in 16 Changing-look Active Galactic Nuclei
• The birth of young radio jets in changing-look AGN: a population study
• Using Faded Changing-Look Quasars to Unveil the Spectral Energy Distribution Evolution of Low-Luminosity Active Galactic Nuclei
• Multi-wavelength properties of changing-state active galactic nuclei: I. the evolution of soft excess and X-ray continuum
• Accretion instabilities and jet formation in GRS 1915+105
• Optical and cm follow-ups of the Changing-Look event in Mkn 590
• Vertical structure of the accreting two-temperature corona and the transition to an ADAF
• Tracing the AGN/X-ray Binary Analogy with Light Curves of Individual Changing-Look AGN
• The ROSAT All-Sky Survey Bright Source Catalogue
• Systematic Analysis of Changing-look AGN Variability Using ZTF Light Curves

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