Interplanetary scintillation observations of 57 flat-spectrum sources at 327 MHz

Details Interplanetary scintillation observations of 57 flat-spectrum sources at 327 MHz Interplanetary scintillation observations of 57 flat-spectrum sources at 327 MHz

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.212..601v&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 212, Feb. 1, 1985, p. 601-608.

Astronomy and Astrophysics

Astronomy

6

Interplanetary Medium, Radio Sources (Astronomy), Scintillation, Astronomical Catalogs, Astronomical Models, Data Sampling, Flux Density

Scientific paper

From interplanetary scintillation observations of an unbiased sample of 57 flat-spectrum radio sources at 327 MHz, compactness parameters, mu, have been determined giving the fraction of the total flux density arising from the compact cores. It is found that the median value of mu = 0.61 and the size of the compact cores is approximately equal to or less than 0.05 arcsec for about half the cases. From VLA data at 5 GHz, the cores are found to have inverted spectra with alpha (5000, 327) = -0.16 on average. Typically the fraction of the total flux density arising from the extended components appproximately equal to or less than 0.04 at 5 GHz, approximately 0.1 at 1 GHz and 0.39 at 327 MHz. The observed N(mu) distribution at 327 MHz is consistent with the predictions of the Orr and Browne model, in which only the core of a classical double radio source gets Doppler boosted. However, the observed asymmetry in the structures of many flat-spectrum sources indicates that either the asymmetry is intrinsic, or a three-component model, having a relativistic core, a mildly relativistic kiloparsec-scale jet or hotspot and non-relativistic diffuse radio lobes, is required to explain flat-spectrum sources.

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