Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..525h&link_type=abstract
In its Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 525-528 (SEE N85-20961 11-89)
Astronomy and Astrophysics
Astronomy
3
Astronomical Photometry, Image Filters, Image Processing, Iue, Point Spread Functions, Spectral Signatures, Deviation, Error Analysis, Goodness Of Fit, Least Squares Method
Scientific paper
A technique is described for automatically filtering low-dispersion IUE images of untrailed point sources during extraction from the guest observer tape, for the purpose of reducing the effects of radiation events and bright pixels and obtaining improved definition of the continuum in long duration or high-background exposures. The method is based upon fitting a gaussian point-spread-function (PSF) to crosscuts of the sample orders in ESSR or LBLS files, which can be processed on a relatively small computer. Several adjacent crosscuts are binned during the fit to permit discriminating against errant samples lying directly along the dispersion line (and narrow spectral lines). The procedure results in a significant reduction of discrepancies in the fitted power-law indices for repeated exposures of faint BL Lac objects, compared with the results of previously attempted automatic filtering techniques.
Hackney R. L.
Hackney R. H. K.
Kondo Yoshihiko
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