Eclipsed X-ray Bursts from Magnetar SGR J1935+2154 and the Fireball Measurements
arXiv:2510.24075 · doi:10.3847/1538-4357/ae433d
Abstract
In theory, burst activity of the magnetar can lead to the formation of fireballs trapped by the magnetic field and corotating with the star. However, the smoking-gun observational evidence of the fireball is elusive. We envisage that the fireball emission should occasionally be eclipsed by the magnetar, especially when the burst duration is comparable to the magnetar's spin period. In this work, we first discover a peculiar type of burst whose light curve has a plateau-like feature among the long bursts of the magnetar SGR J1935+2154 detected by GECAM and Fermi/GBM. Then, based on these bursts, we identified four burst candidates with eclipse-like characteristics. By fitting their light curves with the eclipse fireball model, the viewing angle of the magnetar relative to its spin axis is estimated to be , and the distances from the fireballs to the magnetar are found to be more than 5 times the magnetar's radius, indicating that the fireballs are suspended in the magnetosphere rather than adhering to the magnetar surface. Furthermore, we find that this configuration is well consistent with the implication of the cyclotron resonance scattering feature we found in their spectra. Our results suggest that some intermediate X-ray bursts may originate from magnetic reconnection within the magnetosphere rather than the starquake.
References in corpus (51)
- The Fermi Gamma-Ray Burst Monitor
- Information criteria for astrophysical model selection
- Magnetars
- The McGill Magnetar Catalog
- A fast radio burst associated with a Galactic magnetar
- A bright millisecond-duration radio burst from a Galactic magnetar
- The strongest cosmic magnets: Soft Gamma-ray Repeaters and Anomalous X-ray Pulsars
- Electrodynamics of Magnetars: Implications for the Persistent X-ray Emission and Spindown of the Soft Gamma Repeaters and Anomalous X-ray Pulsars
- HXMT Identification of a non-thermal X-ray burst from SGR J1935+2154 and with FRB 200428
- A peculiar hard X-ray counterpart of a Galactic fast radio burst
- Grand Unification in Neutron Stars
- An expanding radio nebula produced by a giant flare from the magnetar SGR 1806-20
- Statistical properties of SGR 1900+14 bursts
- Systematic study of magnetar outbursts
- Statistical properties of SGR 1806-20 bursts
- The discovery, monitoring and environment of SGR J1935+2154
- A model for cyclotron resonance scattering features
- Discovery of a Radio Source following the 27 December 2004 Giant Flare from SGR 1806-20
- Physical Mechanisms for the Variable Spin-down of SGR 1900+14
- Magnetic Reconnection in Extreme Astrophysical Environments
- A Swift gaze into the 2006 March 29th burst forest of SGR 1900+14
- Dynamics of Strongly Twisted Relativistic Magnetospheres
- Evidence for a Sudden Magnetic Field Reconfiguration in SGR 1900+14
- Ground-based calibration and characterization of the Fermi Gamma-Ray Burst Monitor Detectors
- SGR J1550-5418 bursts detected with the Fermi Gamma-ray Burst Monitor during its most prolific activity
- Diagnosing magnetars with transient cooling
- The NICER View of the 2020 Burst Storm and Persistent Emission of SGR 1935+2154
- Fast radio bursts and their high-energy counterpart from magnetar magnetospheres
- The Five Year Fermi/GBM Magnetar Burst Catalog
- Rapid Spectral Variability of a Giant Flare from a Magnetar in NGC 253
- Identification of a Local Sample of Gamma-Ray Bursts Consistent with a Magnetar Giant Flare Origin
- Burst properties of the most recurring transient magnetar SGR J1935+2154
- Fermi/GBM View of the 2019 and 2020 Burst Active Episodes of SGR J1935+2154
- Nature of fault planes in solid neutron star matter
- On the Distance of SGR 1935+2154 Associated with FRB 200428 and Hosted in SNR G57.2+0.8
- On the dynamics of mechanical failures in magnetized neutron-star crusts
- Time-resolved X-ray spectral modeling of an intermediate burst from SGR1900+14 observed by HETE-2/FREGATE and WXM
- Fast Radio Burst Breakouts from Magnetar Burst Fireballs
- Plastic damping of Alfvén waves in magnetar flares and delayed afterglow emission
- Pulsars and magnetars
- Insight-HXMT dedicated 33-day observation of SGR J1935+2154 I. Burst Catalog
- Revisit the periodicity of SGR J1935+2154 bursts with updated sample
- Soft Gamma Repeaters and Anomalous X-ray Pulsars: Magnetar Candidates
- Fermi-GBM Observations of the SGR J1935+2154 Burst Forest
- An MHD Model For Magnetar Giant Flares
- Magnetar Giant Flares and Their Precursors --- Flux Rope Eruptions with Current Sheets
- The first 7 months of the 2020 X-ray outburst of the magnetar SGR J1935+2154
- Magnetic Energy Buildup for Relativistic Magnetar Giant Flares
- Finding the Particularity of the Active Episode of SGR J1935+2154 during Which FRB 20200428 Occurred: Implication from Statistics of Fermi/GBM X-Ray Bursts
- GECAM Observations of the Galactic Magnetar SGR J1935+2154 during the 2021 and 2022 Burst Active Episodes. I. Burst Catalog
- A Comptonized Fireball Bubble: Physical Origin of Magnetar Giant Flares