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ASCL Code Record

[ascl:1112.012] CORA: Emission Line Fitting with Maximum Likelihood

CORA analyzes emission line spectra with low count numbers and fits them to a line using the maximum likelihood technique. CORA uses a rigorous application of Poisson statistics. From the assumption of Poissonian noise, the software derives the probability for a model of the emission line spectrum to represent the measured spectrum. The likelihood function is used as a criterion for optimizing the parameters of the theoretical spectrum and a fixed point equation is derived allowing an efficient way to obtain line fluxes. CORA has been applied to an X-ray spectrum with the Low Energy Transmission Grating Spectrometer (LETGS) on board the Chandra observatory.

Code site:
https://web.archive.org/web/20220605131839/http://januweness.eu/Cora/ https://ascl.net/assets/codes/cora/cora-4.2.tar.gz
Described in:
https://ui.adsabs.harvard.edu/abs/2002AN....323..129N
Bibcode:
2011ascl.soft12012N

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ascl:1112.012
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