使用Fermi-LAT搜索磁星耀斑的瞬态伽玛射线发射

IF 5.9 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Journal of Cosmology and Astroparticle Physics Pub Date : 2025-07-15 DOI:10.1088/1475-7516/2025/07/050

Vyaas Ramakrishnan and Shantanu Desai

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引用次数: 0

摘要

我们利用Fermi-LAT望远镜与磁星耀斑重合的数据寻找能量范围在0.1-10 GeV的瞬态伽玛射线发射。在我们的分析中，我们使用±1天、±7天和±15天的三个时间窗口来寻找来自11颗磁星的15个不同耀斑的巧合。对于来自10个磁星的14个耀斑，我们没有看到任何统计上显著的伽马射线发射。然而，我们在x射线耀斑开始大约10天后观测到一个可能的伽马射线耀斑，即1E 1048.1-5937，其综合显著性为4.4σ（考虑到寻找别处效应）。然而，这颗磁星靠近银道面（银道纬度为-0.52°），该信号可能是由银道面伽玛射线源的漫射通量污染造成的。

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Search for transient gamma-ray emission from magnetar flares using Fermi-LAT

We search for transient gamma-ray emission in the energy range from 0.1–10 GeV using data from the Fermi-LAT telescope in coincidence with magnetar flares. For our analysis, we look for coincidence with 15 distinct flares from 11 magnetars using three time windows of ± 1 day, ± 7 days, and ± 15 days. For 14 of these flares from 10 magnetars, we do not see any statistically significant gamma-ray emission. However, we see one possible gamma-ray flare from one magnetar, namely 1E 1048.1-5937, with combined significance of 4.4σ, (after considering the look-elsewhere effect) observed after about 10 days from the start of the X-ray flare. However, this magnetar is located close to the galactic plane (with galactic latitude of -0.52°), and this signal could be caused by contamination due to diffuse flux from gamma-ray sources in the galactic plane.

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来源期刊

Journal of Cosmology and Astroparticle Physics 地学天文-天文与天体物理

CiteScore

10.20

自引率

23.40%

发文量

632

审稿时长

1 months

期刊介绍： Journal of Cosmology and Astroparticle Physics (JCAP) encompasses theoretical, observational and experimental areas as well as computation and simulation. The journal covers the latest developments in the theory of all fundamental interactions and their cosmological implications (e.g. M-theory and cosmology, brane cosmology). JCAP''s coverage also includes topics such as formation, dynamics and clustering of galaxies, pre-galactic star formation, x-ray astronomy, radio astronomy, gravitational lensing, active galactic nuclei, intergalactic and interstellar matter.