A ~4.6 h quasi-periodic oscillation in the BL Lacertae PKS 2155-304?

Details A ~4.6 h quasi-periodic oscillation in the BL Lacertae PKS 2155-304? A ~4.6 h quasi-periodic oscillation in the BL Lacertae PKS 2155-304?

2009-09-11

arxiv.org/abs/0909.2113v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

4 pages, 6 figures, accepted for publication in A&A Letters

Scientific paper

We report a possible detection of an ~4.6-hour quasi-periodic oscillation (QPO) in the 0.3-10 keV emission of the high-energy peaked blazar PKS 2155-304 from a 64 ks observation by the XMM-Newton EPIC/pn detector. We identify a total modulation of ~5% in the light curve and confirm that nominal period by periodogram, structure function and wavelet analyses. The limited light curve duration allows the capture of only 3.8 cycles of this oscillation and thus precludes a very strong claim for this QPO, despite a nominally high (>3 sigma) statistical significance. We briefly discuss models capable of producing an X-ray QPO of such a period in a blazar.

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