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Title: QUASI-PERIODICITIES OF THE BL LACERTAE OBJECT PKS 2155–304

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{sup 9} M {sub ☉}, the Keplerian distance corresponding to the quasi-period T is ∼10{sup 16} cm, about 50 Schwarzschild radii.
Authors:
;  [1] ;  [2]
  1. Università degli Studi dell' Insubria, Via Valleggio 11, I-22100 Como (Italy)
  2. INAF-Osservatorio Astronomico di Brera, Via Emilio Bianchi 46, I-23807 Merate (Italy)
Publication Date:
OSTI Identifier:
22365047
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 793; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BL LACERTAE OBJECTS; BLACK HOLES; DIAGRAMS; DISTANCE; EMISSION SPECTRA; GALAXIES; GAMMA RADIATION; MASS; PERIODICITY; PHOTOMETRY; SCHWARZSCHILD RADIUS; VISIBLE RADIATION