Exploring the powering source of the TeV X-ray binary LS 5039

Details Exploring the powering source of the TeV X-ray binary LS 5039 Exploring the powering source of the TeV X-ray binary LS 5039

2009-02-23

arxiv.org/abs/0902.3866v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

6 pages, 1 figure. Needs PoS.cls. Contributed talk at The 9th European VLBI Network Symposium on The role of VLBI in the Golde

Scientific paper

LS 5039 is one of the four TeV emitting X-ray binaries detected up to now. The powering source of its multi-wavelength emission can be accretion in a microquasar scenario or wind interaction in a young non-accreting pulsar scenario. These two scenarios predict different morphologic and peak position changes along the orbital cycle of 3.9 days, which can be tested at milliarcsecond scales using VLBI techniques. Here we present a campaign of 5 GHz VLBA observations conducted in June 2000 (2 runs five days apart). The results show a core component with a constant flux density, and a fast change in the morphology and the position angle of the elongated extended emission, but maintaining a stable flux density. These results are difficult to fit comfortably within a microquasar scenario, whereas they appear to be compatible with the predicted behavior for a non-accreting pulsar.

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