Astrophysique à Haute Energie

Flicker noise impact and design methodology in SiGe BiCMOS integrated front-end electronics for astronomical observations

Increasing the number of sensitive pixels in an instrument is a classical way to improve its observational capabilities. From cosmology, in the millimeter wave range, to high-energy astrophysics space instruments, the readout of thousands of cryogenic detectors requires dedicated electronic developments. Application-specific integrated circuits - ASICs offer major advantages in this context : specific design, small size and optimized performances.

Studying cosmic ray PeVatrons with ultra-high-energy gamma-rays

Recently completed, the Large High Altitude Air Shower Observatory (LHAASO) is the most sensitive detector exploring the sky in the ultra-high-energy (UHE, > 0.1 PeV) gamma-ray domain. It already detected about a dozen sources, whose spectra extend up to photon energies exceeding 1 PeV. Such photons are produced in interactions between protons of multi-PeV energy with ambient matter. These observations are extremely important because, in order to explain the observed spectrum of Galactic cosmic rays, astrophysical sources capable of accelerating protons beyond 1 PeV must exist.

Studying cosmic ray PeVatrons with ultra-high-energy gamma-rays

Recently completed, the Large High Altitude Air Shower Observatory (LHAASO) is the most sensitive detector exploring the sky in the ultra-high-energy (UHE, > 0.1 PeV) gamma-ray domain. It already detected about a dozen sources, whose spectra extend up to photon energies exceeding 1 PeV. Such photons are produced in interactions between protons of multi-PeV energy with ambient matter. These observations are extremely important because, in order to explain the observed spectrum of Galactic cosmic rays, astrophysical sources capable of accelerating protons beyond 1 PeV must exist.

Studying cosmic ray PeVatrons with ultra-high-energy gamma-rays

Completed in 2021, the Large High Altitude Air Shower Observatory  (LHAASO) is the most sensitive instrument probing the sky in the ultra-high-energy (>0.1 PeV) gamma-ray domain. It already detected about a dozen sources whose spectra extend to PeV energies. Such energetic photons are produced in interactions of multi-PeV cosmic rays with ambient matter. LHAASO sources have been tentatively associated with pulsar wind nebulae, young massive stellar clusters and supernova remnants.

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