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CORA: Emission Line Fitting with Maximum Likelihood

Posted: Sat Dec 17, 2011 8:05 am
by kcd
[c]CORA: Emission Line Fitting with Maximum Likelihood[/c][/b]
Abstract: 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.

Credit: Ness, Jan-Uwe; Wichmann, Rainer


Bibcode: 2011ascl.soft12012N

Preferred citation method:

ID: ascl:1112.012