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Indice spectral

L'indice spectral (généralement noté ) d'une source donne certaines informations sur ses propriétés physiques. L'indice spectral est calculé à partir de , où représente le flux et , la fréquence.

Voici une formule plus directe pour déterminer l'indice spectral  :

Interprétation

Un indice spectral de -0,1 indique typiquement une source thermique, ou bien, une émission d'un rayonnement continu de freinage ; tandis qu'un indice spectral de -0,7 indique l'émission d'un rayonnement synchrotron.

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