2017/07/26 by F. Jaron, Frederic Jaron, Richa Sharma +11 · 11 citations
Physics and Astronomy · #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Astrophysics and Cosmic Phenomena #Binary number #Fermi Gamma-ray Space Telescope #Gamma-ray bursts and supernovae #Jet (fluid) #Optics #Photon #Physics #Radio spectrum #Radio telescope #Spectral index #Spectral line #Telescope #X-ray #astro-ph.HE
paper · pdf · doi:10.1093/mnrasl/slx121
published in Monthly Notices of the Royal Astronomical Society Letters 471(1), L110-L114 (Oxford University Press) · 5 pages, 4 figures, accepted for publication in MNRAS
arxiv created 2017/07/26 · openalex publication_date 2017/07/27 · openalex created_date 2017/07/31 · arxiv updated 2017/08/30 · openalex updated_date 2026/08/06
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.