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

Journal Article · Sat Sep 20 00:00:00 EDT 2014 · Astrophysical Journal Letters

DOI:https://doi.org/10.1088/2041-8205/793/1/L1· OSTI ID:22365047

Sandrinelli, A.; Treves, A. ^[1]

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1. Università degli Studi dell' Insubria, Via Valleggio 11, I-22100 Como (Italy)

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.

• OSTI ID: 22365047
• Journal Information: Astrophysical Journal Letters, Vol. 793, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
BL LACERTAE OBJECTS
BLACK HOLES
DIAGRAMS
DISTANCE
EMISSION SPECTRA
GALAXIES
GAMMA RADIATION
MASS
PERIODICITY
PHOTOMETRY
SCHWARZSCHILD RADIUS
VISIBLE RADIATION