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By K. P. Singh A and L. R. Jones B


We have discovered a Narrow-Line Seyfert 1 (NLS1) galaxy and identified it with an ultrasoft X-ray source (RX 215319-1514) detected with ROSAT. We present its X-ray and optical spectral characteristics. Its redshift is found to be 0.0778±0.0002. Its optical spectrum shows fairly strong Fe II emission lines, and its X-ray spectrum has an extremely steep power-law index of Γ ≥4, making it an extremely interesting example of this class of AGNs. No low-energy absorption or variability is observed. The soft X-ray (0.1–2.0 keV) luminosity is estimated to be 3.4–12.5×10 43 ergs s −1, depending on the spectral model

Year: 2000
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