Computer Science – Performance
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mmkyo..37..139s&link_type=abstract
In its Memoirs of the Faculty of Science, Kyoto University. Series of Physics, Astrophysics, Geophysics and Chemistry, Volume 37
Computer Science
Performance
Astronomical Photometry, Digital Techniques, Galaxies, Microdensitometers, Performance Tests, Photographic Plates, Surface Properties, Brightness, Data Reduction, Errors, Signal To Noise Ratios
Scientific paper
A method of digital surface photometry of galaxies was developed to achieve the accurate photometry of the faint outskirt of the galactic disk. The method includes the stack of photographic plates to increase the signal to noise ratio of the data. Performance test of the measuring instrument Joyce-Loebl MDM6 and the procedures of digital surface photometry are fully described. The procedures are applied to the edge-on Sc galaxy NGC 5907 with a particular intention to reveal optical warping of the outer disk. Seven and eight deeply-exposed photographic plates in blue (J) and red (F) color bands, respectively, are analyzed. The photometric accuracy of 0.04 mag at levels brighter than 24.5 J mag arcsec-2 and 0.46 mag at the faintest level is achieved after stacking plates. The photometric data of NGC 5907 are presented in the Vaucouleurs' system in tabular form.
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