Radio QPO in the γ-ray-loud X-ray binary LS I +61°303. (28th July 2017)

• Record Type: Journal Article
• Authors: Jaron, F.; Sharma, R.; Massi, M.; Fuhrmann, L.; Angelakis, E.; Myserlis, I.; Li, Guang-Xing; Shi, Xun
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 471:Number 1(2017:Oct.)
• Page Start: L110
• Page End: L114
• Publication Date: 2017-07-28
• Subjects: Radio continuum: stars -- X-rays: binaries -- X-rays: individual: LS I +61°303; Astronomy -- Research -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnrasl/slx121
• Languages: English
• ISSNs: 1745-3933

Abstract

Abstract: LS I +61°303 is a γ-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°303, along with Cyg X-1, the only TeV emitting X-ray binary exhibiting radio microflares. To further investigate this microflaring activity in LS I +61°303 we observed the source with the 100-m Effelsberg radio telescope at 4.85, 8.35 and 10.45 GHz, and performed a timing analysis on the obtained data. Radio oscillations of 15 h 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 -Large Area Telescope. We conclude that the observed Quasi Periodic Oscillations could result from multiple shocks in a jet.