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- W2036704573 abstract "This letter reports the first clear evidence of a rapid change in the ultraviolet flux of a BL Lac object. Sophisticated analysis of 57 closely spaced IUE spectra yielded clear evidence of an about 12 percent drop in the ultraviolet flux of PKS 2155 - 304 over a 2 day period in October 1989 and a strong indication of a similar drop in a 5 hr period some three weeks later. These are near the fastest variations which could have been detected with these data, but they are still much slower (or weaker) variations than have been observed in the X-rays. However, they are orders of magnitude fater than Seyfert 1 ultraviolet variations. This suggests that a 'standard' Seyfert 1 accretion disk may not be responsible for the ultraviolet emission from PKS 2155 - 304." @default.
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- W2036704573 date "1991-05-01" @default.
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- W2036704573 title "Rapid ultraviolet variability in the BL Lacertae object PKS 2155 - 304" @default.
- W2036704573 doi "https://doi.org/10.1086/186011" @default.
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