60 MeV–10 GeV spectral properties of the Crab Nebula measured in different flux states.
|Component||State (b)||PL Γ||PLEC Γ||PLEC Ec||TSPLEC − TSPL(c)||Integrated flux (d)|
|(GeV)||(10−9 cm−2 s−1)|
|IC (a)||Average||1.415 ± 0.023||…||…||…||107 ± 5|
|High||2.830 ± 0.015||2.497 ± 0.041||0.77 ± 0.10||114.1||8432 ± 92|
|Synchrotron||Average||3.278 ± 0.011||3.250, ± 0.026||6.6 ± 5.7||1.7||2534 ± 15|
|Low||…||…||…||…||370 ± 130|
|Syn+IC||Low||1.653 ± 0.048||…||…||…||221 ± 22|
The parameters of the IC component are determined from the complete ten-year data set, and are assumed to remain constant.
The high and low states are defined based on the 60 MeV–600 MeV light curve of the Crab Nebula (Fig. 2).
Γ is the photon index. Ec is the energy of the exponential cutoff. TSPLEC − TSPL is the difference in test-statistic (TS) between PLEC and PL.
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