Further evidence for the presence of a neutron star in 4U 2206+54. INTEGRAL and VLA observations

The majority of High Mass X-ray Binaries (HMXBs) behave as X-ray pulsars, revealing that they contain a magne- tised neutron star. Among the four HMXBs not showing pulsations, and that do not show the characteristics of accreting bl ack holes, there is the unusual HMXB 4U 2206+54. Here we present contemporaneous high-energy and radio observations of this system conducted with INTEGRALand the VLA in order to unveil its nature. The high-energy spectra show clear indications of the presence of an absorption feature at∼32 keV. This is the third high-energy observatory which reveals marginal evidence of this feature, giving strong support to the existence of a cyc lotron resonance scattering feature, which implies a magnetic field of 3.6×10 12 G. On the other hand, the source is not detected at centimetre radio wavelengths with a 3σ upper limit of 0.039 mJy. The expected radio emission for an accreting black hole in the low/hard state, inferred from X-ray flux measurements, would be at least 60 times greater than the measured upper limit. Both results firmly indicate that, in spite of the absence of pul sations, 4U 2206+54 hosts a magnetic accreting neutron star, the first one not t o be observed as an X-ray pulsar.