Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982spie..331..473j&link_type=abstract
IN: Instrumentation in astronomy IV; Proceedings of the Fourth Conference, Tucson, AZ, March 8-10, 1982 (A83-31976 14-35). Belli
Astronomy and Astrophysics
Astronomy
1
Astronomical Photometry, Faint Object Camera, Galactic Radiation, Image Analysis, Brightness, Digital Data, Simulation
Scientific paper
A method to investigate selection effects in the FOCAS automatic cataloging system is described, in particular the behavior of dim galaxy image parameters in close proximity to brighter images. The study used a group of 116 galaxy images selected from five fields previously processed with FOCAS. For each of the central fields, a prototype object was selected and a position chosen at random within a prespecified distance range from the central object in the field. The chosen galaxy was linearly shrunk by a factor of two, scaled in intensity by 0.16, convolved with a star image appropriate to the central image field, and added to the central image field at the designated location. The modified field was then processed by the FOCAS system to obtain a list of objects. The simulated galaxies were distinguished from the intrinsic images in the field by matching positions. The image parameters thus obtained serve to increase confidence in the automatic cataloging and calibrate various data reduction procedures.
Jarvis J. F.
Tyson Anthony J.
Valdes Francisco
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