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Journal Article

Deep view of composite SNR CTA1 with LHAASO in γ-rays up to 300 TeV

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Aharonian,  F.       
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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2409.09499
(Preprint), 2MB

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Citation

LHASSO Collaboration, Cao, Z., Aharonian, F., Axikegu, Y. X., B., Bao, Y., et al. (2025). Deep view of composite SNR CTA1 with LHAASO in γ-rays up to 300 TeV. Science China - Physics, Mechanics & Astronomy, 68(7): 279503. doi:10.1007/s11433-024-2479-4.


Cite as: https://hdl.handle.net/21.11116/0000-0010-8516-F
Abstract
The ultra-high-energy (UHE) gamma-ray source 1LHAASO J0007+7303u is positionally associated with the composite SNR CTA1 that is located at high Galactic Latitude b ≈ 10.5. This provides a rare opportunity to spatially resolve the compo- nent of the pulsar wind nebula (PWN) and supernova remnant (SNR) at UHE. This paper conducted a dedicated data anal- ysis of 1LHAASO J0007+7303u using the data collected from December 2019 to July 2023. This source is well detected with significances of 21σ and 17σ at 8-100 TeV and >100 TeV, respectively. The corresponding extensions are determined to be 0.23±0.03 and 0.17±0.03. The emission is proposed to originate from the relativistic electrons accelerated within the PWN of PSR J0007+7303. The energy spectrum is well described by a power-law with an exponential cutoff function dN/dE = (42.4 ± 4.1)( E / (20 TeV) )−2.31±0.11 exp(− E / (110±25 TeV) ) TeV−1 cm−2 s−1 in the energy range from 8 to 300 TeV, implying a steady-state parent electron spectrum dNe/dEe ∝ ( Ee / (100 TeV) )−3.13±0.16 exp[( (−Ee) / (373±70 TeV) )2] at energies above ≈ 50 TeV. The cutoff energy of the electron spectrum is roughly equal to the expected current maximum energy of particles accelerated at the PWN terminal shock. Combining the X-ray and gamma-ray emission, the current space-averaged magnetic field can be limited to ≈ 4.5 μG. To satisfy the multi-wavelength spectrum and the γ-ray extensions, the transport of relativistic particles within the PWN is likely dominated by the advection process under the free-expansion phase assumption.