Multi-wavelength (radio, X-ray and gamma-ray) observations of the gamma-ray binary LS I +61 303

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  • 21 January 2008
Abstract
We present the results of the first multiwavelength observing campaign on the high-mass X-ray binary LS I +61 303 comprising observations at the TeV regime with the MAGIC telescope, along with X-ray observations taken with Chandra, and radio interferometric observations taken with the MERLIN, e-EVN and VLBA arrays, in October and November 2006. From our MERLIN observations, we can exclude the existence of large scale ~100 mas) persistent radio-jets. Moreover, our 5.0 GHz VLBA observations display morphological similarities to previous 8.4 GHz VLBA observations carried out at the same orbital phase, suggesting a high level of periodicity and stability of the processes behind the radio emission. This disfavors the possibility that the radio emission is produced by the interaction of an outflow with wind clumps. Further, if the radio emission is produced by a milliarcsecond scale jet, it should also show a stable, periodic behavior, which is difficult to reconcile with the absence of a large scale (~100 mas), relativistic jet. In addition, we find a possible hint of temporal correlation between the X-ray and TeV emissions and evidence for radio/TeV non-correlation, which points to the existence of one population of particles producing the radio emission and a different one producing the X-ray and TeV emissions. Finally, we present a quasi-simultaneous energy spectrum including radio, X-ray and TeV bands.

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