Detection of GeV Gamma-ray Emission of Kepler’s SNR With Fermi-LAT

Xiang, Yunchuan; Jiang, Z. J.

doi:10.3847/1538-4357/abd175

Cited by 15 publications

(16 citation statements)

References 37 publications

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“…observations of Kepler's SNR in 2020. This analysis provides an indication of a GeV counterpart of Kepler's SNR and confirms the results reported by Xiang & Jiang (2021) and Acero et al (2022). The compatibility of the signals in the HE and VHE γ-ray bands supports their common origin and association with Kepler's SNR.…”

Section: Discussionsupporting

confidence: 88%

“…At GeV energies, an excess at about a 4σ statistical level from Kepler's SNR was reported by Xiang & Jiang (2021) and in the proceedings by Prokhorov et al (2021). In Xiang & Jiang (2021), the authors claimed a detection of γ-ray emission from Kepler's SNR despite the presence of residual radiation around Kepler's SNR and concluded that more observation data with IACTs and Fermi-LAT are necessary to firmly confirm the association between the γ-ray source candidate and Kepler's SNR. Using a summed likelihood analysis and a larger allowed range of zenith angles, Acero et al (2022) confirmed a detection of Kepler's SNR above a 6σ level based on 12 yr of Fermi-LAT data.…”

Section: Introductionmentioning

confidence: 72%

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Evidence for γ-ray emission from the remnant of Kepler’s supernova based on deep H.E.S.S. observations

Aharonian¹,

Benkhali²,

Angüner

et al. 2022

A&A

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Observations with imaging atmospheric Cherenkov telescopes (IACTs) have enhanced our knowledge of nearby supernova (SN) remnants with ages younger than 500 yr by establishing Cassiopeia A and the remnant of Tycho’s SN as very-high-energy (VHE) γ-ray sources. The remnant of Kepler’s SN, which is the product of the most recent naked-eye SN in our Galaxy, is comparable in age to the other two, but is significantly more distant. If the γ-ray luminosities of the remnants of Tycho’s and Kepler’s SNe are similar, then the latter is expected to be one of the faintest γ-ray sources within reach of the current generation IACT arrays. Here we report evidence at a statistical level of 4.6σ for a VHE signal from the remnant of Kepler’s SN based on deep observations by the High Energy Stereoscopic System (H.E.S.S.) with an exposure of 152 h. The measured integral flux above an energy of 226 GeV is ∼0.3% of the flux of the Crab Nebula. The spectral energy distribution (SED) reveals a γ-ray emitting component connecting the VHE emission observed with H.E.S.S. to the emission observed at GeV energies with Fermi-LAT. The overall SED is similar to that of the remnant of Tycho’s SN, possibly indicating the same nonthermal emission processes acting in both these young remnants of thermonuclear SNe.

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Section: Discussionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 72%

Evidence for γ-ray emission from the remnant of Kepler’s supernova based on deep H.E.S.S. observations

Aharonian¹,

Benkhali²,

Angüner

et al. 2022

A&A

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“…During the preparation of the H.E.S.S. and Fermi-LAT results reported in this paper, we became aware of the results of [11], who derived similar evidence for the GeV excess toward Kepler's SNR from Fermi-LAT data.…”

Section: Discussionmentioning

confidence: 65%

Deep observations of Kepler's SNR with H.E.S.S

Prokhorov¹,

Vink²,

Simoni³

et al. 2021

Preprint

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Kepler's supernova remnant (SNR) which is produced by the most recent naked-eye supernova in our Galaxy is one of the best studied SNRs, but its gamma-ray detection has eluded us so far. Observations with modern imaging atmospheric Cherenkov telescopes (IACT) have enlarged the knowledge about nearby SNRs with ages younger than 500 years by establishing Cassiopeia A and Tycho's SNRs as very high energy (VHE) gamma-ray sources and setting a lower limit on the distance to Kepler's SNR. This SNR is significantly more distant than the other two and expected to be one of the faintest gamma-ray sources within reach of the IACT arrays of this generation. We report strong evidence for a VHE signal from Kepler's SNR based on deep observations of the High Energy Stereoscopic System (H.E.S.S.) with an exposure of 152 hours, including 122 hours accumulated in 2017-2020. We further discuss implications of this result for cosmic-ray acceleration in young SNRs.

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“…where E 0 is set to 1 TeV, N 0 represents the amplitude, E represents the particle energy, α represents the spectral index, E cutoff represents the break energy (Aharonian et al 2006;Xin et al 2019;Xiang & Jiang 2021). For leptonic origin, which is widely used to explain SED of SNRs in the Mikey Way (e.g., Condon et al 2017;Zeng et al 2017.…”

Section: Variability Analysismentioning

confidence: 99%

“…TSvar ≥ 36.19 was used to identify variable sources at a 99% confidence level for the LC of 20 time bins(Xiang & Jiang 2021).…”

mentioning

confidence: 99%

Detection of GeV $γ$-Ray Emission from supernova remnant SNR G15.9+0.2 with Fermi-LAT

Xiang¹,

Jiang²,

Tang³

2021

Preprint

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We first report GeV γ-ray emission from SNR G15.9+0.2 in this work. We find that its power-law spectral index is 2.13±0.05 with 13.29σ significance level, and the γ-ray emission can be characterized by a 2D Gauss spatial distribution, which has a better improvement than the case of a point source. Moreover, we find that its likely counterparts from radio, X-ray, and TeV energy bands are well coincident with its spatial location. Analyzing the variability from 12.4 years of the light curve (LC), we find that this LC exists weak variability with a 3.30σ variability significance level. Investigating the 2σ error region of its best-fit position, we do not find certified active galactic nuclei (AGNs) and AGNs' candidates from the region of this SNR, so we suggest that the new γ-ray emission is likely to originate from SNR G15.9+0.2. On this basis, we discussed the likely origins of its γ-ray radiation combined with the distribution of surrounding molecular clouds.

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Detection of GeV Gamma-ray Emission of Kepler’s SNR With Fermi-LAT

Cited by 15 publications

References 37 publications

Evidence for γ-ray emission from the remnant of Kepler’s supernova based on deep H.E.S.S. observations

Evidence for γ-ray emission from the remnant of Kepler’s supernova based on deep H.E.S.S. observations

Deep observations of Kepler's SNR with H.E.S.S

Detection of GeV $γ$-Ray Emission from supernova remnant SNR G15.9+0.2 with Fermi-LAT

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