IS COSMIC RAY ELECTRON EXCESS FROM PULSARS SPIKY OR SMOOTH?: CONTINUOUS AND MULTIPLE ELECTRON/POSITRON INJECTIONS
We investigate the observed spectrum of cosmic ray electrons and positrons from astrophysical sources, especially pulsars, and the physical processes for making the spectrum spiky or smooth via continuous and multiple electron/positron injections. We find that (1) the average electron spectrum predicted from nearby pulsars is consistent with PAMELA, Fermi, and H.E.S.S. data. However, the ATIC/PPB-BETS peak around 500 GeV is hard to produce by the sum of multiple pulsar contributions and requires a single (or a few) energetic pulsar(s). (2) A continuous injection produces a broad peak and a high-energy tail above the peak, which can constrain the source duration ({approx}<10{sup 5} years with the current data). (3) The H.E.S.S. data in the TeV range suggest that young sources with age less than {approx}6 x 10{sup 4} years are less energetic than {approx}10{sup 48} erg. (4) We also expect a large dispersion in the TeV spectrum due to the small number of sources that may cause the high-energy cutoff inferred by H.E.S.S. and potentially provide a smoking gun for the astrophysical origin. These spectral diagnostics can be refined in the near future by the CALET experiments to discriminate different astrophysical and dark matter origins.
- OSTI ID:
- 21394468
- Journal Information:
- Astrophysical Journal, Vol. 710, Issue 2; Other Information: DOI: 10.1088/0004-637X/710/2/958; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COSMOLOGY AND ASTRONOMY
ASTROPHYSICS
COSMIC RADIATION
ELECTRON SPECTRA
ELECTRONS
GEV RANGE 100-1000
NONLUMINOUS MATTER
POSITRONS
PULSARS
TEV RANGE
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
COSMIC RADIO SOURCES
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
GEV RANGE
IONIZING RADIATIONS
LEPTONS
MATTER
PHYSICS
RADIATIONS
SPECTRA