Measurement of the Gamma-Ray Energy Spectrum beyond 100 TeV from the HESS J1843$-$033 Region

Abstract

HESS J1843$-$033 is a very-high-energy gamma-ray source whose origin remains unidentified. This work presents, for the first time, the energy spectrum of gamma rays beyond $100\mathrm{TeV}$ from the HESS J1843$-$033 region using the data recorded by the Tibet air shower array and its underground muon detector array. A gamma-ray source with an extension of $0.34^{\circ }\pm 0.12^{\circ }$ is successfully detected above $25\mathrm{TeV}$ at $(\alpha ,\delta )=(281.09^{\circ }\pm 0.10^{\circ },-3.76^{\circ }\pm 0.09^{\circ })$ near HESS J1843$-$033 with a statistical significance of $6.2\sigma$, and the source is named TASG J1844$-$038. The position of TASG J1844$-$038 is consistent with those of HESS J1843$-$033, eHWC J1842$-$035, and LHAASO J1843$-$0338. The measured gamma-ray energy spectrum in $25\mathrm{TeV}<E<130\mathrm{TeV}$ is described with $\mathrm{d}N/\mathrm{d}E=(9.70\pm 1.89)\times 10^{-16}(E/40\mathrm{TeV}{)}^{-3.26\pm 0.30}{\mathrm{TeV}}^{-1}{\mathrm{cm}}^{-2}{\mathrm{s}}^{-1}$, and the spectral fit to the combined spectra of HESS J1843$-$033, LHAASO J1843$-$0338, and TASG J1844$-$038 implies the existence of a cutoff at $49.5\pm 9.0\mathrm{TeV}$. Associations of TASG J1844-038 with SNR G28.6$-$0.1 and PSR J1844-0346 are also discussed in detail for the first time.

11 pages, 4 figures, 1 table

References in corpus (14)

• Array Programming with NumPy
• Extended gamma-ray sources around pulsars constrain the origin of the positron flux at Earth
• Fermi Large Area Telescope Bright Gamma-ray Source List
• Teraelectronvolt Astronomy
• First Detection of sub-PeV Diffuse Gamma Rays from the Galactic Disk: Evidence for Ubiquitous Galactic Cosmic Rays beyond PeV Energies
• FOREST Unbiased Galactic plane Imaging survey with the Nobeyama 45-m telescope (FUGIN) I: Project Overview and Initial Results
• Gamma rays from molecular clouds
• Galactic Supernova Remnant Candidates Discovered by THOR
• Potential PeVatron supernova remnant G106.3+2.7 seen in the highest-energy gamma rays
• The Einstein@Home Gamma-ray Pulsar Survey. I. Search Methods, Sensitivity and Discovery of New Young Gamma-ray Pulsars
• HAWC J2227+610 and its association with G106.3+2.7, a new potential Galactic PeVatron
• Testing Triggered Star Formation in Six H II Regions
• Multiwavelength constraints on the unidentified Galactic TeV sources HESS J1427$-$608, HESS J1458$-$608, and new VHE $\gamma$-ray source candidates
• Constraints on Hadronic Contribution to LHAASO Sources with Neutrino Observations

Cited by in corpus (6)

• Where are Milky Way's Hadronic PeVatrons?
• The LHAASO PeVatron bright sky: what we learned
• Observation of gamma rays up to 320 TeV from the middle-aged TeV pulsar wind nebula HESS J1849$-$000
• HAWC Study of Very-High-Energy $\gamma$-ray Spectrum of HAWC J1844-034
• Analysis of the possible detection of the pulsar wind nebulae of PSR J1208-6238, J1341-6220, J1838-0537 and J1844-0346
• Unraveling the Nature of HAWC J1844-034 with Fermi-LAT Data Analysis and Multi-wavelength Modeling