Bpow - Broken Power Law: Difference between revisions
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==Broken Power Law== | ==Broken Power Law== | ||
===Introduction=== | ===Introduction=== | ||
The broken power law component models the non-thermal portion of the spectrum for a selected time interval during a flare. It fits the spectrum above approximately 25keV with a broken power law, normalized to the value of the count flux at 50keV. | |||
===Parameters=== | ===Parameters=== | ||
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===Fitting with Bpow=== | ===Fitting with Bpow=== | ||
There are four free parameters that are allowed to vary when using Bpow to fit the non-thermal portion of a spectrum. In practice, a[1], the negative power law index below the break energy is set to -1.5 and fixed. | |||
[[Category:Software]] | [[Category:Software]] | ||
Revision as of 18:43, 14 July 2009
Broken Power Law
Introduction
The broken power law component models the non-thermal portion of the spectrum for a selected time interval during a flare. It fits the spectrum above approximately 25keV with a broken power law, normalized to the value of the count flux at 50keV.
Parameters
- a[0] - normalization at epivot
- a[1] - negative power law index below break
- a[2] - break energy (keV)
- a[3] - negative power law index above break
Fitting with Bpow
There are four free parameters that are allowed to vary when using Bpow to fit the non-thermal portion of a spectrum. In practice, a[1], the negative power law index below the break energy is set to -1.5 and fixed.