Radio QPO in the $\gamma$-ray-loud X-ray binary LS I +61${}^{\circ }$303

Abstract

LS I +61${}^{\circ }$303 is a $\gamma$-ray emitting X-ray binary with periodic radio outbursts with time scales of one month. Previous observations have revealed microflares superimposed on these large outbursts with periods ranging from a few minutes to hours. This makes LS I +61${}^{\circ }$303, along with Cyg X-1, the only TeV emitting X-ray binary exhibiting radio microflares. To further investigate these microflaring activity in LS I +61${}^{\circ }$303 we observed the source with the 100-m Effelsberg radio telescope at 4.85, 8.35, and 10.45 GHz and performed timing analysis on the obtained data. Radio oscillations of 15 hours time scales are detected at all three frequencies. We also compare the spectral index evolution of radio data to that of the photon index of GeV data observed by Fermi-LAT. We conclude that the observed QPO could result from multiple shocks in a jet.

arXiv comment5 pages, 4 figures, accepted for publication in MNRAS

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Cited by in corpus (7)

• Detection of a possible high-confidence radio quasi-periodic oscillation in the BL Lac PKS J2134-0153
• Sub-second periodic radio oscillations in a microquasar
• Simultaneous long-term monitoring of LS I +61°303 by OVRO and Fermi-LAT
• A Precessing Jet Scenario for the Multi-Wavelength Long-Term Modulation of LS I +61${}^{\circ }$303
• Hour time-scale QPOs in the X-ray and radio emission of LS I +61${}^{\circ }$303
• Polarization study of gamma-ray binary
• Radio/X-ray correlations and variability in the X-ray binary LS I +61°303