Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...253..244h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 253, no. 1, Jan. 1992, p. 244-251.
Astronomy and Astrophysics
Astronomy
Interplanetary Medium, Interstellar Extinction, Radio Sources (Astronomy), Angular Distribution, Radio Astronomy, Scintillation, Very Long Base Interferometry
Scientific paper
Interstellar scattering (ISS) causes the observed angular sizes of radio sources to appear larger, and its modeling is therefore particularly important in the interpretation of low-frequency, high-resolution observations (such as interplanetary scintillation surveys). These have revealed a marked deficit of sources with small angular sizes which, if not entirely due to ISS, might have cosmological significance. Using a simple mathematical model of galactic scattering, it is shown how ISS affects the number-angular diameter relation observed in an IPS survey as a function of galactic latitude. The average value for the scattering angle (in the polar direction) required to account for the deficit of compact sources in the Cambridge Interplanetary Scintillation Survey at 81.5 MHz is 0.25 +/- 0.03 arcsec.
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