Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-04-27
Mon.Not.Roy.Astron.Soc. 361 (2005) 155-159
Astronomy and Astrophysics
Astrophysics
5 pages, 4 figures, accepted by MNRAS
Scientific paper
10.1111/j.1365-2966.2005.09150.x
Three deep flux minima were observed with nearly the same time-scales and intervals for the blazar PKS 1510-089 in the past few years. A binary black hole system was proposed to be at the nucleus of this object, and a new minimum was predicted to occur in 2002 March. We monitored this source with a 60/90 cm Schmidt telescope from 2002 February to April. In combination with the data obtained by Xie et al. (2004) in the same period, we presented for the 2002 minimum a nearly symmetric light curve, which would be required by an eclipsing model of a binary black hole system. We also constrained the time-scale of the minimum to be 35 min, which is more consistent with the time-scales ~42 min of the three previous minima than the 89 min time-scale given by the same authors. The wiggling miniarcsecond radio jet observed in this object is taken as a further evidence for the binary black hole system. The `coupling' of the periodicity in light curve and the helicity in radio jet is discussed in the framework of a binary black hole system.
Chen Jiahua
Jiang Zhaoji
Ma Jian
Peng Bangbao
Wu Jackson
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