A model for the Balmer pseudocontinuum in spectra of type 1 AGNs

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 the 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.

16 pages, 5 figures, 2 tables, accepted for publication in the Advances in Space Research (ASR)

References in corpus (5)

• Black hole masses and enrichment of z ~ 6 SDSS quasars
• A combined Optical and X-ray Spectra Study for Type 1 AGN. III. Broadband SED Properties
• Spectral Optical Monitoring of the Narrow Line Seyfert 1 galaxy Ark 564
• The analysis of the hydrogen broad Balmer line ratios: possible implications to the physical properties of the BLR of AGN
• Spectral properties of a sample of type 1 AGNs: influence of star formation

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