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

P. Blay·M. Ribo·I. Negueruela·J. M. Torrejon·P. Reig·A. Camero·I. F. Mirabel·V. Reglero
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Abstract

The majority of High Mass X-ray Binaries (HMXBs) behave as X-ray pulsars, revealing that they contain a magnetised neutron star. Among the four HMXBs not showing pulsations, and that do not show the characteristics of accreting black holes, there is the unusual HMXB 4U 2206+54. Here we present contemporaneous high-energy and radio observations of this system conducted with INTEGRAL and 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 cyclotron resonance scattering feature, which implies a magnetic field of 3.6 x 10^12 G. On the other hand, the source is not detected at centimetre radio wavelengths with a 3 sigma 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 pulsations, 4U 2206+54 hosts a magnetic accreting neutron star, the first one not to be observed as an X-ray pulsar.

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P. Blay, M. Ribo, I. Negueruela, J. M. Torrejon, P. Reig, A. Camero, I. F. Mirabel, V. Reglero. 2005-04-03. Further evidence for the presence of a neutron star in 4U 2206+54. INTEGRAL and VLA observations. https://doi.org/10.1051/0004-6361%3A20042207

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