In theγ-ray sky,the highest fluxes come from Galactic sources:supernova remnants(SNRs),pulsars and pulsar wind nebulae,star forming regions,binaries and micro-quasars,giant molecular clouds,Galactic center,and the la...In theγ-ray sky,the highest fluxes come from Galactic sources:supernova remnants(SNRs),pulsars and pulsar wind nebulae,star forming regions,binaries and micro-quasars,giant molecular clouds,Galactic center,and the large extended area around the Galactic plane.The radiation mechanisms ofγ-ray emission and the physics of the emitting particles,such as the origin,acceleration,and propagation,are of very high astrophysical significance.A variety of theoretical models have been suggested for the relevant physics,and emission with energies E≥10^(14) eV are expected to be crucial in testing them.In particular,this energy band is a direct window to test at which maximum energy a particle can be accelerated in the Galactic sources and whether the most probable source candidates such as Galactic center and SNRs are“PeVatrons”.Designed aiming at the very high energy(VHE,>100 GeV)observation,LHAASO will be a very powerful instrument in these astrophysical studies.Over the past decade,great advances have been made in the VHEγ-ray astronomy.More than 170 VHEγ-ray sources have been observed,and among them,42 Galactic sources fall in the LHAASO field-of-view.With a sensitivity of 10 milli-Crab,LHAASO can not only provide accurate spectra for the knownγ-ray sources,but also search for new TeV-PeVγ-ray sources.In the following sub-sections,the observation of all the Galactic sources with LHAASO will be discussed in details.展开更多
The energy spectrum of cosmic Hydrogen and Helium nuclei has been measured below the so-called ＂knee＂ by using a hybrid experiment with a wide field-of-view Cherenkov telescope and the Resistive Plate Chamber （RPC...The energy spectrum of cosmic Hydrogen and Helium nuclei has been measured below the so-called ＂knee＂ by using a hybrid experiment with a wide field-of-view Cherenkov telescope and the Resistive Plate Chamber （RPC） array of the ARGO-YBJ experiment at 4300 m above sea level. The Hydrogen and Helium nuclei have been well separated from other cosmic ray components by using a multi-parameter technique. A highly uniform energy resolution of about 25% is achieved throughout the whole energy range （100-700 TeV）. The observed energy spectrum is compatible with a single power law with index γ=-2.63±0.06.展开更多
基金Supported by Key Research and Development Project(2018YFA0404204,2016YFA0400804)the National Natural Science Foundation of China(11905043,11803011,12173018,12121003,11773014,11633007,U1931204,U1731136)+2 种基金the Original Innovation Program of the Chinese Academy of Sciences(E085021002)Guangdong Major Project of Basic and Applied Basic Research(2019B030302001)science research grant from the China Manned Space Project(CMS-CSST-2021-B09)。
文摘In theγ-ray sky,the highest fluxes come from Galactic sources:supernova remnants(SNRs),pulsars and pulsar wind nebulae,star forming regions,binaries and micro-quasars,giant molecular clouds,Galactic center,and the large extended area around the Galactic plane.The radiation mechanisms ofγ-ray emission and the physics of the emitting particles,such as the origin,acceleration,and propagation,are of very high astrophysical significance.A variety of theoretical models have been suggested for the relevant physics,and emission with energies E≥10^(14) eV are expected to be crucial in testing them.In particular,this energy band is a direct window to test at which maximum energy a particle can be accelerated in the Galactic sources and whether the most probable source candidates such as Galactic center and SNRs are“PeVatrons”.Designed aiming at the very high energy(VHE,>100 GeV)observation,LHAASO will be a very powerful instrument in these astrophysical studies.Over the past decade,great advances have been made in the VHEγ-ray astronomy.More than 170 VHEγ-ray sources have been observed,and among them,42 Galactic sources fall in the LHAASO field-of-view.With a sensitivity of 10 milli-Crab,LHAASO can not only provide accurate spectra for the knownγ-ray sources,but also search for new TeV-PeVγ-ray sources.In the following sub-sections,the observation of all the Galactic sources with LHAASO will be discussed in details.
基金Supported by NSFC(10975145,11075170)Knowledge Innovation Fund(H85451D0U2)of IHEP+2 种基金Chinese Ministry of Science and Technology,Chinese Academy of Science,Key Laboratory of Particle Astrophysics,CASin Italy by the Istituto Nazionale di Fisica Nucleare(INFN)Ministero dell’Istruzione,dell’Università e della Ricerca(MIUR)
文摘The energy spectrum of cosmic Hydrogen and Helium nuclei has been measured below the so-called ＂knee＂ by using a hybrid experiment with a wide field-of-view Cherenkov telescope and the Resistive Plate Chamber （RPC） array of the ARGO-YBJ experiment at 4300 m above sea level. The Hydrogen and Helium nuclei have been well separated from other cosmic ray components by using a multi-parameter technique. A highly uniform energy resolution of about 25% is achieved throughout the whole energy range （100-700 TeV）. The observed energy spectrum is compatible with a single power law with index γ=-2.63±0.06.
