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Narrow-line Seyfert 1 galaxies. Relationship between their frequency of occurrence and the large-scale structure of the universe

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Abstract

A previously published method is applied to the SDSS DR 7 data in order to determine the spatial densities of narrow-line and broad-line Seyfert galaxies (NLSs and BLSs) as functions of the density of galaxies in a complete, uniform sample that traces the large-scale structure of the Universe. These relationships are linear and the NLS/BLS ratio is constant, suggesting that NLSs and BLSs comprise a fixed fraction of all galaxies, which does not depend on the local galaxy density. Results obtained using the applied technique support the presence of a higher fraction of red galaxies in regions with higher local galaxy densities.

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Correspondence to A. A. Ermash.

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Original Russian Text © A.A. Ermash, 2014, published in Astronomicheskii Zhurnal, 2014, Vol. 91, No. 4, pp. 263–274.

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Ermash, A.A. Narrow-line Seyfert 1 galaxies. Relationship between their frequency of occurrence and the large-scale structure of the universe. Astron. Rep. 58, 205–216 (2014). https://doi.org/10.1134/S1063772914040052

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  • DOI: https://doi.org/10.1134/S1063772914040052

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