Simultaneous long-term monitoring of LS I +61°303 by OVRO and Fermi-LAT

Abstract

Previous long-term monitorings of the gamma-ray-loud X-ray binary LS I +61°303 have revealed the presence of a long-term modulation of ~4.5 years. After nine years of simultaneous monitoring of LS I +61°303 by the Owens Valley Radio Observatory and the Fermi-LAT, two cycles of the long-term period are now available. Here we perform timing-analysis on the radio and the gamma-ray light curves. We confirm the presence of previously detected periodicities at both radio and GeV gamma-ray wavelengths. Moreover, we discover an offset of the long-term modulation between radio and gamma-ray data which could imply different locations of the radio (15 GHz) and GeV emission along the precessing jet.

arXiv comment8 pages, 7 figures, 2 tables, accepted for publication in MNRAS

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• Revisiting LS I +61 303 with VLBI astrometry
• Superorbital modulation at GeV energies in the gamma-ray binary LS I +61 303
• Radio QPO in the $\gamma$-ray-loud X-ray binary LS I +61${}^{\circ }$303
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Cited by in corpus (6)

• Discovery of the Galactic High-Mass Gamma-ray Binary 4FGL J1405.1-6119
• Evidence for periodic accretion-ejection in LSI+61303
• Modelling the correlated keV/TeV light curves of Be/gamma-ray binaries
• A Precessing Jet Scenario for the Multi-Wavelength Long-Term Modulation of LS I +61${}^{\circ }$303
• Owens Valley Radio Observatory monitoring of LS I +61°303 completes three cycles of the super-orbital modulation
• Rapid X-ray variability of the gamma-ray binary LS I+61 303