Evidence for refractive scintillation of two extragalactic sources seen through the galactic disk

Details Evidence for refractive scintillation of two extragalactic sources seen through the galactic disk Evidence for refractive scintillation of two extragalactic sources seen through the galactic disk

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...313..141d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 313, Feb. 1, 1987, p. 141-145.

Astronomy and Astrophysics

Astrophysics

12

Astronomical Spectroscopy, Extragalactic Radio Sources, Milky Way Galaxy, Refracted Waves, Scintillation, Interstellar Matter, Light Curve

Scientific paper

Extragalactic radio sources were qualitatively examined to determine if there are any cases in which apparent variations at 2.7 GHz are uncorrelated with variations at 8.1 GHz, as might be expected for extrinsically induced refractive scintillation. Two sources exhibiting this behavior were identified, NRAO 150 and 2013 + 370, both of which happen to lie within 2 deg of the Galactic plane. The calculated refractive scintillation properties, based on intrinsic VLBI sizes and scattering measurements in the Galactic disk, are in reasonable agreement with the observed fluctuations. The light curves of these sources are interpreted as significantly affected by refractive scintillation in the interstellar medium. The findings suggest that extragalactic sources seen through extended paths in the Galactic disk may be modulated by refractive scintillation even at gigahertz frequencies.

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