NICER observations reveal doubled timescales in Ansky's quasi-periodic eruptions (QPEs) Article Swipe
L. Hernández-García
,
P. Sánchez-Sáez
,
Joheen Chakraborty
,
Jorge Cuadra
,
G. Miniutti
,
R. Arcodia
,
P. Arévalo
,
M. Giustini
,
Erin Kara
,
Cláudio Ricci
,
D. R. Pasham
,
Z. Arzoumanian
,
Keith C. Gendreau
,
P. Lira
·
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.48550/arxiv.2509.16304
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.48550/arxiv.2509.16304
Quasi-periodic eruptions (QPEs) are recurring X-ray bursts originating from the vicinity of supermassive black holes, but their driving mechanisms remain under debate. This study analyzes new NICER observations of QPEs in Ansky (a transient event in the nucleus of the galaxy SDSS J1335+0728), taken between January and June 2025. By examining flare durations, peak-to-peak recurrence times, and profiles, we compare the 2025 data with those from 2024 to investigate changes in energy, timescales, and flare shapes. The 2025 QPEs are found to be four times more energetic, with recurrence times of approximately 10 days and flare durations ranging from 2.5 to 4 days, making them both about twice as long as in 2024. Additionally, the flare profiles have become more asymmetric, showing longer decays. We explore different theoretical scenarios to explain the observed properties of the QPEs in Ansky, including evolving stream-disk interactions in an extreme mass-ratio inspiral (EMRI) system as a potential mechanism behind the observed changes in recurrence time and energetics, while also considering alternative models based on mass transfer and accretion disk instabilities. Continued observational efforts will be crucial for unveiling the nature of Ansky.
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- Type
- preprint
- Language
- en
- Landing Page
- http://arxiv.org/abs/2509.16304
- https://arxiv.org/pdf/2509.16304
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https://openalex.org/W4415250660Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.48550/arxiv.2509.16304Digital Object Identifier
- Title
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NICER observations reveal doubled timescales in Ansky's quasi-periodic eruptions (QPEs)Work title
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preprintOpenAlex work type
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enPrimary language
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2025Year of publication
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2025-09-19Full publication date if available
- Authors
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L. Hernández-García, P. Sánchez-Sáez, Joheen Chakraborty, Jorge Cuadra, G. Miniutti, R. Arcodia, P. Arévalo, M. Giustini, Erin Kara, Cláudio Ricci, D. R. Pasham, Z. Arzoumanian, Keith C. Gendreau, P. LiraList of authors in order
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https://arxiv.org/abs/2509.16304Publisher landing page
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https://arxiv.org/pdf/2509.16304Direct link to full text PDF
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YesWhether a free full text is available
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greenOpen access status per OpenAlex
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https://arxiv.org/pdf/2509.16304Direct OA link when available
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0Total citation count in OpenAlex
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