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- W2110279615 abstract "We have used the ROSAT Bright Source Catalogue to extract a complete sample of sources selected in the band from . This 0.25 keV-selected sample is composed of 54 Seyfert galaxies, 25 BL Lacertae objects, 4 clusters and 27 Galactic stars or binaries. Seyfert-type galaxies with ‘ultrasoft’ X-ray spectra can very often be classed optically as narrow-line Seyfert 1s (NLS1s). Such objects are readily detected in 0.25 keV surveys; the sample reported here contains 20 NLS1s, corresponding to a 40 per cent fraction of the Seyferts. Optical spectra of the Seyfert galaxies were gathered for correlative analysis, which confirmed the well-known relations between X-ray slope and optical spectral properties (e.g. [O iii]/Hβ ratio; Fe ii strength, Hβ width). The various intercorrelations are most likely driven, fundamentally, by the shape of the photoionizing continuum in Seyfert nuclei. We argue that a steep X-ray spectrum is a better indicator of an ‘extreme’ set of physical properties in Seyfert galaxies than is the narrowness of the optical Hβ line." @default.
- W2110279615 created "2016-06-24" @default.
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- W2110279615 date "2001-10-21" @default.
- W2110279615 modified "2023-10-18" @default.
- W2110279615 title "A complete sample of Seyfert galaxies selected at 0.25 keV" @default.
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- W2110279615 doi "https://doi.org/10.1046/j.1365-8711.2001.04763.x" @default.
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