摘要:

The Gamma Ray Large Area Space Telescope (GLAST) is a high energy astronomy mission planned for launch in 2005. GLAST features two instruments; the Large Area Telescope (LAT) operating from 20 MeV–300 GeV and the Gamma-ray Burst Monitor (GBM) operating from 10 keV–25 MeV. GLAST observations will contribute to our understanding of active galactic nuclei and their jets, gamma-ray bursts, extragalactic and galactic diffuse emissions, dark matter, supernova remnants, pulsars, and the unidentified high energy gamma-ray sources. The LAT sensitivity is4×10−9photons cm−2s−1(>100 MeV) for a one year all-sky survey, which is a factor of >20 better than CGRO/EGRET. GLAST spectral observations of gamma-ray bursts cover over 6 orders of magnitude in energy thanks to the context observations of the GBM. The upper end of the LAT energy range merges with the low energy end of ground-based observatories to provide a remarkable new perspective on particle acceleration in the Universe. ©2001 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1370776

出版商:AIP    

年代:1901

数据来源: AIP

摘要:

©2001 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1370777

出版商:AIP    

年代:1901

数据来源: AIP

摘要:

I give a brief overview of cosmic ray physics, highlighting some key questions and how they will be addressed by new experiments. ©2001 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1370778

出版商:AIP    

年代:1901

数据来源: AIP

摘要:

©2001 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1370779

出版商:AIP    

年代:1901

数据来源: AIP

摘要:

This paper reviews some properties of Galactic Supernova Remnants (SNRs), including their classification at radio wavelengths, the selection effects that apply to their identification, and their statistical properties. Also discussed are the radio spectral properties of SNRs, both their integrated spectra, and the evidence for spectral variations across the face of individual SNRs. ©2001 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1370780

出版商:AIP    

年代:1901

数据来源: AIP

摘要:

Particle acceleration in shell-type supernova remnants is discussed with particular emphasis on factors determining the shape and location of the upper cut-off in the accelerated particle spectrum. ©2001 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1370781

出版商:AIP    

年代:1901

数据来源: AIP

摘要:

The Japanese satellite ACSA (Advanced Satellite for Cosmology and Astrophysics) provides us with the first hard X-ray imaging spectroscopic observations on the X-ray sky. The spatial resolved spectroscopy on the shells of supernova remnants revealed non-thermal emission in the hard X-ray bands. Since the hard X-ray spectra are smooth connected to that of the radio synchrotron, the X-rays are also due to synchrotron processes from high energy electrons. Inverse Compton gamma rays are detected from two of the SNRs, hence are established the presence of high energy electrons. Combined with the X-ray, radio and gamma-ray data, we estimated the maximum energy of electrons to be1014&hthinsp;eV.The maximum electron energy is determined from the competing process between the Fermi acceleration and synchrotron energy loss. Protons, of which synchrotron energy loss is negligible, can therefore reach higher energy than electrons, possibly near the knee energy of cosmic rays. ©2001 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1370782

出版商:AIP    

年代:1901

数据来源: AIP

摘要:

A brief review of the modern theory of cosmic ray and associated high-energy &ggr;-ray production in supernova remnants is presented. Examples typical for supernovae type Ia, Ib and II are analyzed. The correspondence between observed properties of the emission produced by accelerated cosmic rays in SN 1006 and SN 1987A, and theoretical predictions is discussed. ©2001 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1370783

出版商:AIP    

年代:1901

数据来源: AIP

摘要:

High-energy gamma rays are a valuable tool for studying particle acceleration and radiation in the magnetospheres of energetic pulsars. The six or more pulsars seen by CGRO/EGRET show that: the light curves usually have double-peak structures (suggesting a broad cone of emission); gamma rays are frequently the dominant component of the radiated power; and all the spectra show evidence of a high-energy turnover. Unless a new pulsed component appears at higher energies, progress in gamma-ray pulsar studies will be greatest in the 1–20 GeV range. Ground-based telescopes whose energy ranges extend downward toward 10 GeV should make important measurements of the spectral cutoffs. The Gamma-ray Large Area Space Telescope (GLAST), now in planning for a launch in 2005, will provide a major advance in sensitivity, energy range, and sky coverage. ©2001 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1370784

出版商:AIP    

年代:1901

数据来源: AIP

摘要:

Pulsed emission from &ggr;-ray pulsars originates inside the magnetosphere, from radiation by charged particles accelerated near the magnetic poles or in the outer gaps. In polar cap models, the high energy spectrum is cut off by magnetic pair production above an energy that is dependent on the local magnetic field strength. While most young pulsars with surface fields in the rangeB=1012−1013&hthinsp;Gare expected to have high energy cutoffs around several GeV, the gamma-ray spectra of old pulsars having lower surface fields may extend to 50 GeV. Although the gamma-ray emission of older pulsars is weaker, detecting pulsed emission at high energies from nearby sources would be an important confirmation of polar cap models. Outer gap models predict more gradual high-energy turnovers at around 10 GeV, but also predict an inverse Compton component extending to TeV energies. Detection of pulsed TeV emission, which would not survive attenuation at the polar caps, is thus an important test of outer gap models. Next-generation gamma-ray telescopes sensitive to GeV-TeV emission will provide critical tests of pulsar acceleration and emission mechanisms. ©2001 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.1370785

出版商:AIP    

年代:1901

数据来源: AIP