The observation of a population of massive black hole binaries (MBHBs) is key
    for our complete understanding of galaxy mergers and for the characterization
    of the expected gravitational waves (GWs) signal. However, MBHBs still remain
    elusive with only a few candidates proposed to date. Among these,
    SDSSJ143016.05+230344.4 (‘tick-tock’ hereafter) is the only candidate with a
    remarkably well sampled light curve showing a clear reduction of the modulation
    period and amplitude over three years of observations. This particular feature
    has been recently claimed to be the signature of a MBHB that is about to merge.
    In this paper, we provide an optical follow-up of the tick-tock source using
    the Rapid Eye Mount (REM) telescope. The decreasing luminosity observed in our
    follow up is hardly explained within the binary scenario. We speculate about an
    alternative scenario that might explain the observed light curve through
    relativistic Lense-Thirring precession of an accretion disc around a single
    massive black hole.

    Source link


    Leave A Reply