The Crab Nebula as a standard candle in very high-energy astrophysics

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Volume 523 (November-December 2010)

A&A, 523 (2010) A2

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Table 2

Parameters for the electron spectrum used for the constant B-field model.

		Constant B-field model
Parameters		Radio	Wind


Normalization constant ..............................	ln(N₀)	120.0(1)	78.6(3)
Low energy cut-off^a .................................	ln(γ_min)	3.1	12.96(3)
Super exponential cut-off parameter..................	β	–	2.8(4)
Break position.......................................	ln(γ_break)	–	19.5(1)
High energy cut-off^b.................................	ln(γ_max)	12.1(7)	22.51(3)
Spectral index .......................................	S	1.60(1)	3.23(1)
Spectral index (after break)...........................	S + ΔS	–	3.76(3)

Notes.

^(a)

At the energy γ_min the radio electron spectrum cuts off sharply whereas the wind electrons cut off superexponentially.

^(b)

The energy γ_max denotes a sharp cut-off for the radio and wind electrons.

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