A1 Refereed original research article in a scientific journal
Simultaneous long-term monitoring of LS I+61 degrees 303 by OVRO and Fermi-LAT
Authors: Jaron F, Massi M, Kiehlmann S, Hovatta T
Publisher: OXFORD UNIV PRESS
Publication year: 2018
Journal: Monthly Notices of the Royal Astronomical Society
Journal name in source: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Journal acronym: MON NOT R ASTRON SOC
Volume: 478
Issue: 1
First page : 440
Last page: 447
Number of pages: 8
ISSN: 0035-8711
eISSN: 1365-2966
DOI: https://doi.org/10.1093/mnras/sty1037
Web address : https://academic.oup.com/mnras/article/478/1/440/4985847
Self-archived copy’s web address: https://arxiv.org/abs/1804.07692
Abstract
Previous long-term monitorings of the gamma-ray-loud X-ray binary LS I +61 degrees 303 have revealed the presence of a long-term modulation of similar to 4.5 yr. After 9 yr of simultaneous monitoring of LS I +61 degrees 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.
Previous long-term monitorings of the gamma-ray-loud X-ray binary LS I +61 degrees 303 have revealed the presence of a long-term modulation of similar to 4.5 yr. After 9 yr of simultaneous monitoring of LS I +61 degrees 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.
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