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- W201658712 abstract "Abstract This paper reports on AGN with extremely soft X-ray spectra observed with ROSAT . From their optical emission lines, these objects are classified as narrow-line Seyfert 1 galaxies (NLSl), almost all with extremely large Fe II /H β flux ratios and relatively narrow optical lines of hydrogen. NLSl have generally steeper soft X-ray continuum slopes than normal Seyfert 1s, and there may exist an anticorrelation between 0.1–2.4 keV continuum slope and the FWHM of the H β line. Objects with steep 0.1–2.4 keV continuum slopes and H β FWHM > 3000 km s −1 are clearly discriminated against by nature. When simple power-law models are fit to the data, photon indices reach values up to about 5, much higher than is usually seen in Seyfert 1s. Models with smaller-mass black holes and/or higher accretion rates show some promise to explain the relation between the FWHM of the H β line and the X-ray continuum slope. We further report evidence for persistent giant and rapid variability in the ultrasoft narrow-line Seyfert 1 galaxy IRAS 13224–3809." @default.
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- W201658712 title "A Link Between Seyfert Emission-Line Widths and X-Ray Continuum Slopes" @default.
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- W201658712 doi "https://doi.org/10.1017/s0252921100040203" @default.
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