A connection between the X-ray spectral branches and the radio brightness in GX17+2

Astronomy and Astrophysics – Astronomy

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Neutron Stars, Radio Sources (Astronomy), Stellar Mass Accretion, X Ray Binaries, Horizontal Branch Stars, Radiant Flux Density, Stellar Color, Stellar Oscillations, Very Large Array (Vla)

Scientific paper

GX17+2 (4U 1813-14) is a bright X-ray binary in which matter is accreting on to a neutron star from a nearby companion. The authors report on simultaneous X-ray and radio observations which showed a connection between the spectral branches and the radio brightness. The 6-cm and 20-cm flux density increased by factors of 30±5 and 40±10, respectively, as the X-ray state changed from the so-called "flaring branch" to the "horizontal branch". They suspect that this X-ray/radio connection is common among bright low-mass X-ray binaries.

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