A model for the Balmer pseudocontinuum in spectra of type 1 AGNs |
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Authors: | Jelena Kova?evi? Luka ? Popovi? Wolfram Kollatschny |
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Institution: | 1. Astronomical Observatory, Volgina 7, 11060 Belgrade, Serbia;2. Institut för Astrophysik, Universität Göttingen, Friedrich-Hund Platz 1, 37077 Göttingen, Germany |
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Abstract: | Here we present a new method for subtracting the Balmer pseudocontinuum in the UV part of type 1 AGN spectra. We calculate the intensity of the Balmer pseudocontinuum using the prominent Balmer lines in AGN spectra. We apply the model on a sample of 293 type 1 AGNs from SDSS database, and found that our model of Balmer pseudocontinuum + power law continuum very well fits the majority of AGN spectra from the sample, while in ∼15% of AGNs, the model fits reasonable the UV continuum, but a discrepancy between the observed and fitted spectra is noted. Some of the possible reasons for the discrepancy may be a different value for the optical depth in these spectra than used in our model or the influence of the intrinsic reddening. |
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Keywords: | Galaxies: active Quasars: emission lines |
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