Interstellar medium parameters derived from the variability of radio sources at low frequencies

Details Interstellar medium parameters derived from the variability of radio sources at low frequencies Interstellar medium parameters derived from the variability of radio sources at low frequencies

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...233..535m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 233, no. 2, July 1990, p. 535-539.

Astronomy and Astrophysics

Astronomy

18

Interstellar Space, Low Frequencies, Radio Sources (Astronomy), Scintillation, Statistical Analysis, Brightness Temperature, Models, Very Long Base Interferometry, Wave Scattering

Scientific paper

A statistical analysis has been performed of a sample of 408 MHz variable sources with low frequency VLBI data. The purpose of the investigation is a test of the refractive interstellar scintillation theory and the determination of parameters of the interstellar medium. Evidence was found of a galactic modulation of variability events with time scale of the order of less than one year. The regime characterized by a longer time scale can not be fitted within the present scintillation theory. The derived medium parameters are in agreement with a model in which irregularities move at a relative velocity of approximately 50 km/s, in a layer of thickness of 1000 pc centered on the galactic plane, as is generally assumed. However, the characteristic scattering angular size of the irregularities, found to be 1.3 mas at 408 MHz is a factor of 3-4 smaller than that computed in the refractive scintillation theory.

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