Spectral index behaviour of low frequency variable radio sources

Details Spectral index behaviour of low frequency variable radio sources Spectral index behaviour of low frequency variable radio sources

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...110..345m&link_type=abstract

Astronomy and Astrophysics, vol. 110, no. 2, June 1982, p. 345-347.

Astronomy and Astrophysics

Astronomy

2

Astronomical Spectroscopy, Low Frequencies, Periodic Variations, Radiant Flux Density, Radio Sources (Astronomy), Radio Telescopes, Spectrum Analysis

Scientific paper

Results are presented of observations made at 6 cm and 2.8 cm using the Effelsberg 100-m radiotelescope of 20 sources exhibiting flux density variability at low frequency. The computed spectral indices of these variable sources reveal that 13 have flat spectra and seven have steep spectra. A comparison is made with the findings of previous studies. It is found that, considering variable sources and sources that are probably variable as a whole, approximately 43% of the flat-spectrum sources are variables. This is consistent with the findings of Fanti et al. (1981). Two variable sources and five sources that are probably variable are classified as having steep spectra. It is noted that the findings confirm that the phenomenon of low-frequency variability is not confined to flat spectrum sources.

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