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Evidence for GeV Emission from the Superluminous Supernova SN 2017egm
Shang Li1, Yun-Feng Liang2, Neng-Hui Liao3
1Anhui University, School of Physics, Hefei 230601, China.
Physical Review Letters
|April 3, 2026
Summary
Scientists detected a gamma-ray signal from a nearby Superluminous Supernova (SLSNe), SN 2017egm. This discovery supports the theory that a young magnetar powers these extremely bright cosmic explosions.
Area of Science:
- High-energy astrophysics
- Transient astronomical events
- Supernova physics
Background:
- Superluminous supernovae (SLSNe) are exceptionally bright stellar explosions, significantly more luminous than typical supernovae.
- The precise origin and energy mechanisms of SLSNe remain a significant puzzle in astrophysics.
- A leading hypothesis suggests a rapidly spinning magnetar as the central engine powering SLSNe.
Purpose of the Study:
- To investigate the potential for gamma-ray emission from SLSNe.
- To search for high-energy counterparts of nearby SLSNe using archival data.
- To test the magnetar engine model for SLSNe.
Main Methods:
- Analyzed 15 years of Fermi-LAT Pass 8 data for gamma-ray signals.
- Focused the search on the direction of SN 2017egm, a nearby SLSN.
- Utilized Monte Carlo simulations to assess the statistical significance of any detected signal.
Main Results:
- Identified a transient gamma-ray source spatially and temporally coincident with SN 2017egm.
- The gamma-ray signal exhibited a global significance of at least 4 sigma.
- The observed timing and luminosity of the GeV emission align with predictions from the magnetar model.
Conclusions:
- The detected GeV transient is likely the high-energy counterpart of SN 2017egm.
- These findings provide strong evidence for a young magnetar as the central engine powering this SLSN.
- This study offers crucial observational support for the magnetar model in explaining the extreme luminosity of SLSNe.
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