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- W3005368393 abstract "We report the discovery and analysis of the follow- up ROSAT pointed observation, an ASCA observation and op- tical and radio observations of the enigmatic soft X-ray AGN RX J0134.2-4258. In the optical, RX J0134.2-4258 appears as an extreme 'Narrow-Line Seyfert 1 galaxy' (NLS1), with very strong FeII emission, very blue optical continuum spec- trum and almost no Narrow Line Region emission. While its spectrum was one of the softest observed from an AGN dur- ing the ROSAT All-Sky Survey, its spectrum was found to be dramatically harder during a pointed observation although the count rate remained constant. We found in the pointed obser- vation that the spectrum is softer when it is fainter and spectral fitting demonstrates that it is the hard component that is variable. The ASCA observation confirms the presence of a hard X-ray power law, the slope of which is rather flat compared with other NLS1s. Survey and followup radio observations reveal that RX J0134.2-4258 is also unusual in that it is a member of the rare class of radio-loud NLS1s, and, with R=71, it holds the current record for largest radio-to-optical ratio in NLS1s. We discuss possible scenarios to explain its strange behaviour." @default.
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- W3005368393 date "2000-04-01" @default.
- W3005368393 modified "2023-09-23" @default.
- W3005368393 title "The enigmatic soft X-ray AGN RX J0134.2-4258 ?" @default.
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