Flux density variability of 1741-038: Refractive scintillation and intrinsic variations

Details Flux density variability of 1741-038: Refractive scintillation and intrinsic variations Flux density variability of 1741-038: Refractive scintillation and intrinsic variations

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...295...47q&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 295, no. 1, p. 47-53

Astronomy and Astrophysics

Astrophysics

15

Astronomical Models, Flux Density, Periodic Variations, Quasars, Refractivity, Scintillation, Extragalactic Radio Sources, Galactic Structure, Interstellar Matter, Light Scattering, Power Spectra, Spectrum Analysis

Scientific paper

The structure functions D(tau) of the flux density variations at 2.7 GHz and 8.1 GHz in the compact radio source 1741-038 (z = 1.054) are compared with those at 1.5, 4.9, 15 and 22 GHz given by Hjellming & Narayan (1986) for a similar observing period. It is shown that for time lags 5 is less than or approximately tau is less than or approximately 30 days the structure functions at 2.7 GHz and 1.5 GHz are very similar and can be approximately represented by a power lae D(tau) varies as taup with index p approximately 1.7 - 1.8. The structure functions at 8.1, 15 and 22 GHz differ from those at the lower frequencies. A two-component model involving the extended Galactic interstellar medium and a thin screen with enhanced scattering strength is proposed. Using the refractive interstellar scintillation theory, the theoretical structure functions for the six observing frequencies are calculated. It is shown that the observed structure functions at 1.5 and 2.7 GHz can be well fitted by the model. The theoretical structure functions for the three higher frequencies (8.1, 15 and 22 GHz) are found to be much smaller than the observed structure functions. Thus the high frequency variations can not be fitted within the presently discussed RISS models and are probably intrinsic to the source.

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