First Detection of sub-PeV Diffuse Gamma Rays from the Galactic Disk: Evidence for Ubiquitous Galactic Cosmic Rays beyond PeV Energies

Amenomori, M.; Bao, Yiwei; Bi, X. J.; Chen, D.; Chen, T. L.; Chen, Wen-Yun; Chen, Xu; Chen, Y.; Cirennima,; Cui, S. W.; Danzengluobu,; Ding, L. K.; Fang, J.; Fang, Kun; Feng, C.; Feng, Z.; Feng, Z. Y.; Gao, Qi; Gou, Q. B.; Guo, Y. Q.; Guo, Y. Y.; He, H. H.; He, Ze; Hibino, K.; Hotta, N.; Hu, Haibing; Hu, Hongbo; Huang, J.; Jia, H. Y.; Jiang, L.; Jin, Hong-Bo; Kasahara, K.; Katayose, Y.; Kato, C.; Kato, Shinsuke; Kawata, K.; Kihara, W.; Ko, Y.; Kozai, M.; Labaciren,; Le, G. M.; Li, A. F.; Li, H. J.; Li, W. J.; Lin, Yu-Hui; Liu, B.; Liu, Chuan-Zhou; Liu, J. S.; Liu, M. Y.; Liu, W.; Lou, Y.; Lü, H.; Meng, X. R.; Munakata, K.; Nakada, H.; Nakamura, Yuya; Nanjo, H.; Nakamura, Masaki; Ohnishi, M.; Ohura, T.; Ozawa, S.; Qian, Xuan; Qu, X. B.; Saito, T.; Sakata, M.; Sako, T. K.; Shao, J.; Shibata, M.; Shiomi, A.; Sugimoto, H.; Takano, W.; Takita, M.; Tan, Y. H.; Tateyama, N.; Torii, Shoji; Tsuchiya, H.; Udo, S.; Wang, H.; Wu, H. R.; Xue, L.; Yamamoto, Y.; Yang, Z.; Yokoe, Y.; Yuan, A. F.; Zhai, L. M.; Zhang, H. M.; Zhang, J. L.; Zhang, Xiang; Zhang, X. Y.; Zhang, Y.; Zhang, Yi; Zhang, Ying; Zhao, S. P.; Zhaxisangzhu,; Zhou, X. X.; γ<, mrow>; mrow,; msub,

doi:10.1103/physrevlett.126.141101

Cited by 174 publications

(145 citation statements)

References 38 publications

Supporting

Mentioning

118

Contrasting

Order By: Relevance

“…Also, the CR spectral hardening at rigidity around 300 GeV measured by PAMELA and AMS [4] seems not to be a local effect but rather a large-scale feature. Finally, the dominant contribution to the radiation at multi TeV from the Galaxy seems to be diffuse emission, in agreement with recent results by the Tibet Array observatory [7]. Due to the uncertain contribution to the measured emission coming from unresolved sources, the results presented here are a maximum limit for the GDE.…”

Section: Discussionsupporting

confidence: 91%

“…The contribution of the GDE flux to the total emission is calculated in 2 energy ranges; between 300 GeV and 10 TeV, and between 300 GeV and 100 TeV, that are shown as f10 and f100 respectively [( GDE ) / ( tot )]. The contribution of the diffuse emission to the total gamma-ray radiation from the Galactic Plane varies between 71.8% and 76.1% in different sub-regions (see Table 1) [7]. Assuming that the spectrum of the diffuse emission is described as in energy, its spectral index is −2.61 ± 0.03 (see table 1).…”

Section: Resultsmentioning

confidence: 99%

“…Thus at TeV energies the diffuse emission from background CRs should be faint and difficult to detect [10]. However, recent measurements by Tibet Array [6] point to a significant genuine diffuse component to the Galactic Plane radiation at hundred TeVs. Studying the GDE helps to reconstruct the distribution of background CRs in the Galaxy and solve the open questions concerning the spectrum of the CR sea.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Galactic Gamma-Ray Diffuse Emission at TeV energies with HAWC Data

Nayerhoda¹,

Abeysekara²,

Albert³

et al. 2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

View full text Add to dashboard Cite

The Galactic gamma-ray diffuse emission is produced by the interaction of cosmic rays with ambient gas and electromagnetic radiation fields in the interstellar medium (ISM). Studying this radiation helps reconstruct the particle transport mechanisms and the particle distribution in the Galaxy. In this work, we analyze the TeV diffuse emission in a chosen region of the Galactic plane using data collected with the High Altitude Water Cherenkov (HAWC) detector. The energy and spatial distributions of the diffuse Galactic gamma-ray radiation have been studied after subtracting extended and point sources detected with greater than 5 sigma significance from the region map. The spectral feature of the aforementioned emission is compatible with the gamma-ray emissivity obtained from the locally measured proton and heavier nuclei spectrum, convolved with the gas distribution in the Galaxy.

show abstract

Section: Discussionsupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Galactic Gamma-Ray Diffuse Emission at TeV energies with HAWC Data

Nayerhoda¹,

Abeysekara²,

Albert³

et al. 2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

View full text Add to dashboard Cite

show abstract

“…The absorption length of PeV -rays via pair production in the cosmic microwave background is of the order of 10 kpc, comparable to the distance of the solar system to the Galactic Center. Only Galactic PeVatrons are visible via this channel, consistent with recent observations by HAWC [14], Tibet-AS [15] and LHAASO [16].…”

Section: Towards a Search For Pev Gamma-rayssupporting

confidence: 90%

New insights from old cosmic rays: A novel analysis of archival KASCADE data

Kostunin¹,

Plokhikh²,

Ahlers³

et al. 2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

View full text Add to dashboard Cite

Cosmic ray data collected by the KASCADE air shower experiment are competitive in terms of quality and statistics with those of modern observatories. We present a novel mass composition analysis based on archival data acquired from 1998 to 2013 provided by the KASCADE Cosmic ray Data Center (KCDC). The analysis is based on modern machine learning techniques trained on simulation data provided by KCDC. We present spectra for individual groups of primary nuclei, the results of a search for anisotropies in the event arrival directions taking mass composition into account, and search for gamma-ray candidates in the PeV energy domain.

show abstract

“…Diffuse gamma-ray emission detected by H.E.S.S. [8] and the Tibet Air Shower Array [9] can be used to predict diffuse neutrino emission but is not considered in this work.…”

Section: Discussionmentioning

confidence: 99%

Predicting Neutrino Emission for the Sources in the H.E.S.S. Galactic Plane Survey

Batzofin¹,

Komin²

2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

View full text Add to dashboard Cite

The H.E.S.S. Galactic Plane Survey has detected very-high-energy (VHE) gamma-ray emission from 78 sources in the Milky Way. These sources belong to different object classes (pulsar wind nebulae, supernova remnants or binary systems) and some of these sources remain unidentified. The gamma-ray emission of these objects may be of leptonic or hadronic origin and gamma-ray observations alone cannot distinguish between these two scenarios. The detection of neutrino emission would provide evidence for a hadronic scenario in these objects.Based on the observed gamma-ray spectra we predict the neutrino emission of these sources under the hypothesis that the emission is solely of hadronic origin. This prediction relies entirely on observation and is independent of the source class, the distance or the ambient target material. We use these predictions to create an empirical model for the neutrino emission of the Milky Way. This model can be used to search for neutrino emission from individual gamma-ray sources as well as testing for neutrino emission from potential source populations in the Milky Way.

show abstract

First Detection of sub-PeV Diffuse Gamma Rays from the Galactic Disk: Evidence for Ubiquitous Galactic Cosmic Rays beyond PeV Energies

Cited by 174 publications

References 38 publications

Galactic Gamma-Ray Diffuse Emission at TeV energies with HAWC Data

Galactic Gamma-Ray Diffuse Emission at TeV energies with HAWC Data

New insights from old cosmic rays: A novel analysis of archival KASCADE data

Predicting Neutrino Emission for the Sources in the H.E.S.S. Galactic Plane Survey

Contact Info

Product

Resources

About