The Crab pulsar and its pulsar-wind nebula in the optical and infrared

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Volume 508 / No 1 (December II 2009)

A&A, 508 1 (2009) 221-228

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Table 6:

Measued spectral indices from known PWN.
Pulsar (Area)	Wavelength range	Spectral index
Crab (Wisp 1)	$U \rightarrow K_{\rm s}$	$-0.58\pm0.08^a$
Crab (Wisp 2)	$U \rightarrow K_{\rm s}$	$-0.63\pm0.07$
Crab (Wisp 3)	$U \rightarrow K_{\rm s}$	$-0.53\pm0.08$
Crab (Anvil Wisp)	$U \rightarrow K_{\rm s}$	$-0.62\pm0.10$
Crab (Interwisp 1)	$U \rightarrow K_{\rm s}$	$-0.61\pm0.08$
Crab (Interwisp 2)	$U \rightarrow K_{\rm s}$	$-0.50\pm0.10$
Crab (Interwisp 3)	$U \rightarrow K_{\rm s}$	$-0.49\pm0.10$
Crab (Knot)	$I \rightarrow K_ {\rm s}$	$-0.63\pm0.02$
Vela (Inner arc)^c	X-rays $\rightarrow$ IR	$-0.5 \rightarrow -0.3$
3C58 (Optical region)^b	X-rays	$-0.88\pm0.08$
3C58	Optical $\rightarrow$ IR	$-1.2\rightarrow$ -0.5^d
PSR B0540-69.3 (Area 1)^d	$U\rightarrow I$	$\rm -1.09^{+0.30}_{-0.33}$
PSR B0540-69.3 (Area 2)	$U\rightarrow I$	$\rm -1.58^{+0.42}_{-0.43}$
PSR B0540-69.3 (Area 3)	$U\rightarrow I$	$\rm -1.28^{+0.41}_{-0.43}$
PSR B0540-69.3 (Area 4)	$U\rightarrow I$	$\rm -1.49^{+0.59}_{-0.67}$
PSR B0540-69.3 (Area 5)	$U\rightarrow I$	$\rm -0.92^{+0.33}_{-0.37}$
PSR B0540-69.3 (Area 6)	$U\rightarrow I$	$\rm -0.27^{+0.90}_{-0.91}$

^a 1 $\sigma$ error in the uncertainties of the spectral indices of the Crab PWN; ^b from Shibanov et al. (2003); ^c from Shibanov et al. (2008); ^d see Shibanov et al. (2008) for details; ^e see Serafimovich et al. (2004) for orientation.

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