Paper
IGR J12580+0134: A Candidate for Repeating Partial Tidal Disruption Events Supported by Multi-Wavelength Observations
Authors
Po Ma, Shao-Yu Fu, Linhui Wu, Wei-Hua Lei, Qiang Yuan
Abstract
Repeating partial tidal disruption events (pTDEs) provide a direct probe of stellar orbits and episodic mass loss around supermassive black holes, but robust identification requires multi-band and multi-epoch evidence. We investigate whether the late-time radio rebrightening of the nuclear transient IGR J12580+0134 in NGC 4845 can be explained as a repeating pTDE, using multi-epoch Karl G. Jansky VLA observations together with X-ray constraints from Swift/XRT and NICER. The radio light curves show two distinct episodes, with the L-band peaks separated by $\approx1513$ days. Modeling the second episode with a synchrotron afterglow framework using Markov Chain Monte Carlo fitting favors a non-relativistic outflow $v\simeq0.03c$, with an isotropic-equivalent kinetic energy of order $10^{50}$ erg propagating in an approximately constant-density circumnuclear medium. No significant contemporaneous brightening is detected by Swift/XRT during the 2016 radio flare, while faint NICER flares in 2023 suggest intermittent low-level accretion. The recurrence timescale and radio energetics therefore make IGR J12580+0134 a possible candidate for a repeating pTDE system, motivating continued sensitive radio and X-ray monitoring to test future reactivations.
Metadata
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Raw Data (Debug)
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"raw_xml": "<entry>\n <id>http://arxiv.org/abs/2602.22040v1</id>\n <title>IGR J12580+0134: A Candidate for Repeating Partial Tidal Disruption Events Supported by Multi-Wavelength Observations</title>\n <updated>2026-02-25T15:47:56Z</updated>\n <link href='https://arxiv.org/abs/2602.22040v1' rel='alternate' type='text/html'/>\n <link href='https://arxiv.org/pdf/2602.22040v1' rel='related' title='pdf' type='application/pdf'/>\n <summary>Repeating partial tidal disruption events (pTDEs) provide a direct probe of stellar orbits and episodic mass loss around supermassive black holes, but robust identification requires multi-band and multi-epoch evidence. We investigate whether the late-time radio rebrightening of the nuclear transient IGR J12580+0134 in NGC 4845 can be explained as a repeating pTDE, using multi-epoch Karl G. Jansky VLA observations together with X-ray constraints from Swift/XRT and NICER. The radio light curves show two distinct episodes, with the L-band peaks separated by $\\approx1513$ days. Modeling the second episode with a synchrotron afterglow framework using Markov Chain Monte Carlo fitting favors a non-relativistic outflow $v\\simeq0.03c$, with an isotropic-equivalent kinetic energy of order $10^{50}$ erg propagating in an approximately constant-density circumnuclear medium. No significant contemporaneous brightening is detected by Swift/XRT during the 2016 radio flare, while faint NICER flares in 2023 suggest intermittent low-level accretion. The recurrence timescale and radio energetics therefore make IGR J12580+0134 a possible candidate for a repeating pTDE system, motivating continued sensitive radio and X-ray monitoring to test future reactivations.</summary>\n <category scheme='http://arxiv.org/schemas/atom' term='astro-ph.HE'/>\n <published>2026-02-25T15:47:56Z</published>\n <arxiv:comment>13 pages, 6 figures, 2 tables, submitted to ApJ</arxiv:comment>\n <arxiv:primary_category term='astro-ph.HE'/>\n <author>\n <name>Po Ma</name>\n </author>\n <author>\n <name>Shao-Yu Fu</name>\n </author>\n <author>\n <name>Linhui Wu</name>\n </author>\n <author>\n <name>Wei-Hua Lei</name>\n </author>\n <author>\n <name>Qiang Yuan</name>\n </author>\n </entry>"
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