... The instrument uses a high-speed optical system to form an image on the entrance slit of a matching stigmatic spectrograph, which then disperses a spectrum of a strip of the sky onto a charge-coupled device (CCD). ... Fast camera lenses, narrowband Ha пlters, and charge-coupled device (CCD) detectors combine to give an image пeld of several degrees with 0Ў resolution and a .1 sensitivity to 1 R or less (Gaustad et al. ... The spectrum and the sky are imaged on the CCD detector. ...

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• http://www.astro.louisville.edu/shared_skies/documents/shared_skies_student_projects.pdf

... 337, 275­292 (2002) The correlation of line strength with luminosity and redshift from composite quasi-stellar object spectra S. M. Croom,1 K. Rhook,1 E. A. Corbett,1 B. J. Boyle,1 H. Netzer,2 N. S. Loaring,3 L ... We measure highly significant Baldwin effects for most broad emission lines (C IV 1549, C III] 1909, Mg II 2798, H ,H ) and show that they are predominantly caused by correlations with luminosity, not redshift. ... The correlations of log W with log(1 + z ) for each line. ...