Astronomy and Astrophysics – Astronomy
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...372l...9e&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 372, May 1, 1991, p. L9-L12. SERC-supported research.
Astronomy and Astrophysics
Astronomy
31
Active Galactic Nuclei, Astronomical Photometry, Bl Lacertae Objects, Black Holes (Astronomy), Ultraviolet Spectra, X Ray Sources, Accretion Disks, Galactic Structure, Iue, Light Curve, Seyfert Galaxies
Scientific paper
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.
Carini Michael T.
Edelson Richard A.
George Ian Michael
Miller Richard H.
Pike G.
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