2017MNRAS.468.3709S -
Mon. Not. R. Astron. Soc., 468, 3709-3717 (2017/July-1)
Interstellar scintillations of PSR B1919+21: space-ground interferometry.
SHISHOV V.I., SMIRNOVA T.V., GWINN C.R., ANDRIANOV A.S., POPOV M.V., RUDNITSKIY A.G. and SOGLASNOV V.A.
Abstract (from CDS):
We carried out observations of pulsar PSR B1919+21 at 324 MHz to study the distribution of interstellar plasma in the direction of this pulsar. We used the RadioAstron (RA) space radio telescope, together with two ground telescopes: Westerbork (WB) and Green Bank (GB). The maximum baseline projection for the space-ground interferometer was about 60 000 km. We show that interstellar scintillation of this pulsar consists of two components: diffractive scintillations from inhomogeneities in a layer of turbulent plasma at a distance z1 = 440 pc from the observer or homogeneously distributed scattering material to the pulsar; and weak scintillations from a screen located near the observer at z2 = 0.14 ± 0.05 pc. Furthermore, in the direction to the pulsar we detected a prism that deflects radiation, leading to a shift in observed source position. We show that the influence of the ionosphere can be ignored for the space-ground baseline. Analysis of the spatial coherence function for the space-ground baseline (RA-GB) yielded a scattering angle in the observer plane of θscat = 0.7 mas. An analysis of the time-frequency correlation function for weak scintillations yielded an angle of refraction in the direction to the pulsar θ_ref, 0_ = 110 ms and a distance to the prism zprism <= 2 pc.
Abstract Copyright:
© 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
Journal keyword(s):
scattering - pulsars: general - pulsars: individual: (B1919+21) - pulsars: individual: (B1919+21)
Simbad objects:
4
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