Radio Emission from X-Ray Binary:

Discussion in 'Astronomy, Exobiology, & Cosmology' started by paddoboy, Nov 13, 2017.

  1. paddoboy Valued Senior Member

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    https://phys.org/news/2017-11-astronomers-radio-emission-symbiotic-x-ray.html
    Astronomers discover radio emission from a symbiotic X-ray binary:

    (Phys.org)—Using the Karl G. Jansky Very Large Array (VLA), an international group of researchers has detected radio emissions from the accreting X-ray pulsar and symbiotic X-ray binary system designated GX 1+4. It is the first discovery of radio emissions from a symbiotic X-ray binary and the first indication of a jet from an accreting X-ray pulsar with a strong magnetic field. The findings are reported November 6 in a paper published on arXiv.org.

    Discovered in 1970, GX 1+4 is an accreting X-ray pulsar some 14,000 light years away with a relatively long rotation period of about 120 seconds. It accretes matter from its companion M6III-type red giant, V2116 Oph, which is circling the pulsar every 1,161 days. Therefore, the system was classified as a symbiotic X-ray binary (SyXRB) as it consists of a neutron star low-mass X-ray binary accreting from the stellar wind of a M-type giant donor.

    Read more at: https://phys.org/news/2017-11-astronomers-radio-emission-symbiotic-x-ray.html#jCp


    the paper:

    https://arxiv.org/pdf/1711.01958.pdf

    Discovery of radio emission from the symbiotic X-ray binary system GX 1+4

    ABSTRACT
    We report the discovery of radio emission from the accreting X-ray pulsar and symbiotic X-ray binary GX 1+4 with the Karl G. Jansky Very Large Array. This is the first radio detection of such a system, wherein a strongly magnetized neutron star accretes from the stellar wind of an M-type giant companion. We measure a 9 GHz radio flux density of 105.3 ± 7.3 µJy, but cannot place meaningful constraints on the spectral index due to a limited frequency range. We consider several emission mechanisms that could be responsible for the observed radio source. We conclude that the observed properties are consistent with shocks in the interaction of the accretion flow with the magnetosphere, a synchrotron-emitting jet, or a propeller-driven outflow. The stellar wind from the companion is unlikely to be the origin of the radio emission. If the detected radio emission originates from a jet, it would show that that strong magnetic fields (≥ 1012 G) do not necessarily suppress jet formation.
     

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