A supermassive black hole under the radar: Repeating X-ray variability in a Seyfert galaxy

Matteo Imbrogno; Andrea Sacchi; Giovanni Miniutti; Francesco Tombesi; Gian Luca Israel; Enrico Piconcelli; Roberta Amato

doi:10.1051/0004-6361/202557527/pdf

January 20, 2026

A supermassive black hole under the radar: Repeating X-ray variability in a Seyfert galaxy

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Key Points

To investigate short-term X-ray variability in a supermassive black hole and its spectral properties over 20 years.
Conducted an automated search for X-ray sources in the Chandra archive.
Analyzed short-term variability patterns observed in a Seyfert galaxy.
Examined long-term flux and spectral parameter evolution spanning 20 years.
Observed peculiar variability patterns with typical timescales of approximately 20-30 ks.
Found hints of a softer-when-brighter behavior in the spectral analysis.
Identified two distinct flux states, suggesting the object may represent a relatively low-mass SMBH with potential unique variability.

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Implication

Automated detection reveals peculiar X-ray variability in a Seyfert galaxy's supermassive black hole, suggesting new insights into low-mass black holes.

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Imbrogno et al. (2026) studied this question.

synapsesocial.com/papers/6975b38dfeba4585c2d6efd7 https://doi.org/10.1051/0004-6361/202557527/pdf

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A supermassive black hole under the radar: Repeating X-ray variability in a Seyfert galaxy

Key Points

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Implication

Discussion

Cite This Study

A supermassive black hole under the radar: Repeating X-ray variability in a Seyfert galaxy

Key Points

No abstract yet

Implication

Discussion

Cite This Study

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