Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...266...72w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 266, no. 1, p. 72-76.
Astronomy and Astrophysics
Astronomy
19
Active Galactic Nuclei, Astronomical Spectroscopy, Emission Spectra, Seeing (Astronomy), Apertures, Calibrating, Charge Coupled Devices, Spectrum Analysis
Scientific paper
In variability studies of the broad emission lines in the spectra of active galactic nuclei, the narrow emission lines are generally used to flux calibrate spectra taken at different epochs to each other. In objects where the narrow-line region is resolved, seeing affects the ratio of narrow-line flux to broad-line and continuum flux entering the aperture. Thus observing under different seeing conditions introduces artificial correlated variations of the continuum and broad-line fluxes if we assume the narrow lines to be constant in flux. We show that we can correct for this effect by simulating seeing variations using a narrow-band forbidden O III image, taken in good seeing conditions, of the nearby Seyfert 1 galaxy NGC 3516, in which the narrow-line region is clearly resolved and extends over more than 20 arcsec. We also show that centering the aperture on the object consistently is very important and miscentering is also a source of artificial variability of the broad-line and continuum fluxes.
Derobertis Michael
Peterson Bradley. M.
Pogge Richard W.
van Groningen Ernst
Wanders Ignaz
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