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Sandrinelli, A; Covino, S; Treves, A
Astrophysical journal. Letters, 09/2014, Letnik: 793, Številka: 1Journal Article
We have searched for periodicities in our VRIJHK photometry of PKS 2155-304, which covers the years 2005-2012. A peak of the Fourier spectrum with high significance is found at T ~ 315 days, confirming the recent findings by Zhang et al. The examination of the gamma-ray light curves from the Fermi archives yields a significant signal at ~2T, which, while nominally significant, involves data spanning only ~6T. Assuming a black hole mass of 10 super(9) M sub(middot in circle), the Keplerian distance corresponding to the quasi-period T is ~10 super(16) cm, about 50 Schwarzschild radii.
