Optical variability of the strong-lined and X-ray bright source 1WGA J0447.9-0322

Details Optical variability of the strong-lined and X-ray bright source 1WGA J0447.9-0322 Optical variability of the strong-lined and X-ray bright source 1WGA J0447.9-0322

2006-11-28

arxiv.org/abs/astro-ph/0611839v1

Astron.J.133:965-970,2007

Astronomy and Astrophysics

Astrophysics

17 pages, 4 figures, accepted by The Astronomical Journal. Table 2 available upon request

Scientific paper

10.1086/510514

We present the historic light curve of 1WGA J0447.9-0322, spanning the time interval from 1962 to 1991, built using the Asiago archive plates. The source shows small fluctuations of about 0.3 mag around B=16 until 1986 and a fast dimming of its average level by about 0.5 mag after that date, again with small short term variations. The variability pattern is within the values shown by other QSOs with long term monitoring, notwithstanding its high X-ray/optical ratio. We present also its overall SED using literature data and recent UV-optical SWIFT observations.

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