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An algorithm for the relative scaling of spectra
1992 (English)In: Publications of the Astronomical Society of the Pacific, ISSN 0004-6280, Vol. 104, no 678, 700-703703 p.Article in journal (Refereed) Published
Abstract [en]

A method is described for the automatic relative scaling of spectra in which one or more lines with constant flux are present. The algorithm takes into account differences in spectral resolution, flux factors, and spectral shifts. It was developed for the relative calibration of series of optical spectra obtained in variability studies of active galactic nuclei but it also can be used for other purposes, e.g., the subtraction of an underlying stellar continuum in AGN with a template spectrum. Tests show that a high degree of accuracy is obtained, and that the method is superior to scaling the spectra by eye or measuring narrow-band fluxes

Place, publisher, year, edition, pages
1992. Vol. 104, no 678, 700-703703 p.
Keyword [en]
Application, Experimental/ astronomical spectra, astronomical techniques, galactic nuclei, quasars, visible astronomical observations/ astronomical spectra relative scaling algorithm, visible, constant flux spectral lines, forbidden O III lines, H beta, galactic nuclei spectral variations, forbidden S II lines, underlying stellar continuum subtraction, Fe II lines, AGN broad-line regions, narrow emission lines scaling, automatic relative scaling, spectral resolution, flux factors, spectral shifts, relative calibration, optical spectra, active galactic nuclei, template spectrum, 473.0 to 536.0 nm, forbidden O 2+ lines, forbidden S + lines, Fe + blends, H emission line/ A9575F Astronomical spectroscopy A9850G Radiation and spectra of galaxies A9850R Active and peculiar galaxies A9850E Galactic structure, content and morphology A9870J Quasars A9580J Photographic region astronomical observations A9575M Astronomical data and image processing/ wavelength 4.73E-07 to 5.36E-07 m/ O/el, S/el, Fe/el, H/el
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:uu:diva-197175DOI: 10.1086/133039ISI: 4289974OAI: oai:DiVA.org:uu-197175DiVA: diva2:611959
Available from: 2013-03-19 Created: 2013-03-18 Last updated: 2013-03-19

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van Groningen, E.
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