Evidence of jet activity from the secondary black hole in the OJ287 binary system
arxiv(2024)
摘要
We report the study of a huge optical intraday flare on November 12, 2021, at
2 am UT, in the blazar OJ287. In the binary black hole model it is associated
with an impact of the secondary black hole on the accretion disk of the
primary. Our multifrequency observing campaign was set up to search for such a
signature of the impact, based on a prediction made eight years earlier. The
first I-band results of the flare have already been reported by
. Here we combine these data with our monitoring in
the R-band. There is a big change in the R-I spectral index by 1.0±0.1
between the normal background and the flare, suggesting a new component of
radiation. The polarization variation during the rise of the flare suggests the
same. The limits on the source size place it most reasonably in the jet of the
secondary black hole. We then ask why we have not seen this phenomenon before.
We show that OJ287 was never before observed with sufficient sensitivity on the
night when the flare should have happened according to the binary model. We
also study the probability that this flare is just an oversized example of
intraday variability, using the Krakow-dataset of intense monitoring between
2015 and 2023. We find that the occurrence of a flare of this size and rapidity
is unlikely. In the Appendix, we give the full orbit-linked historical light
curve of OJ287 as well as the dense monitoring sample of Krakow.
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