Automated analysis of objective-prism spectra. I - Quasar detection

Details Automated analysis of objective-prism spectra. I - Quasar detection Automated analysis of objective-prism spectra. I - Quasar detection

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.213..971h&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 213, April 15, 1985, p. 971-989.

Astronomy and Astrophysics

Astronomy

72

Astronomical Spectroscopy, Image Analysis, Photographic Recording, Quasars, Automation, Color-Magnitude Diagram, Data Processing, Data Sampling, Raster Scanning, Signal To Noise Ratios

Scientific paper

An automated quasar detection system based on the establishment of decision criteria in the examination of a large number of low resolution photographic spectra is described. A Prism Reduction System measures, analyzes and classifies low resolution spectra from photographic plates. The criteria include identification and classification of a large fraction of the population on a given plate, the presence of objects which correspond to well-defined selection criteria, and the absence of contaminated spectra around the anomalous object. The images are, on an object-by-object basis, subjected to a 256 x 256 pixel raster scan for transformation to celestial coordinates, examined for spectral characteristics, and cleansed of contaminating spectra. The system is also suitable for detecting H II galaxies and carbon stars and has been proven highly accurate in comparison with manual examinations of known fields down to about 20 mag.

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