21 CM flux density measurements of sources from the NRAO-MPIfR 6 CM surveys

Details 21 CM flux density measurements of sources from the NRAO-MPIfR 6 CM surveys 21 CM flux density measurements of sources from the NRAO-MPIfR 6 CM surveys

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84..942w&link_type=abstract

Astronomical Journal, vol. 84, July 1979, p. 942-945.

Astronomy and Astrophysics

Astronomy

23

Centimeter Waves, Extragalactic Radio Sources, Radiant Flux Density, Radio Astronomy, Data Reduction, Decametric Waves, Quasars, Radio Galaxies, Tables (Data)

Scientific paper

Results are presented for 21-cm observations of 345 sources from four NRAO-MPI 6-cm surveys of extragalactic sources. Twenty-one-centimeter flux densities are reported, along with two-point 21-cm/6-cm spectral indices. The distribution of the two-point spectral indices is determined for a complete sample of NRAO-MPI sources with 6-cm flux densities of at least 0.8 Jy. A histogram of this spectral-index (alpha) distribution is plotted which exhibits the well-known double peak. It is shown that galaxies are mainly responsible for the peak around alpha -0.8, while quasars form the peak around alpha 0.

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