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Line Fitting is done at two points in the spectroscopic pipeline; The first time it is done as part of finding emission lines in order to measure an emission line redshift, secondly after the redshift has been determined, all possible lines in the line list are measured. These line lists are identified in the science archive as 'found' and 'measured' people wishing to retrieve line parameters should go to the 'measured' list. One further caveat the value of chi2 should be checked for each line in order to make sure that the pipeline was able to converge on a reasonable fit. To the right is the line list used, the colored lines are used in the emission line redshift routine. The lines in red are searched for in qsos, those in blue for galaxies, and those in green for both galaxies and qsos. Note: Wavelengths are in vacuum. For a number of qso lines the wavelength used is not the rest wavelength, but the position of those lines in the composite qso template, where the OIII lines were assumed to be at the restframe of the qso. |
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