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

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 s...

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Bibliographic Details
Published in:The Astronomical journal 1979-07, Vol.84, p.942-945
Main Authors: Witzel, A., Pauliny-Toth, I. I. K., Nauber, U., Schmidt, J.
Format: Article
Language:English
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Summary: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.
ISSN:0004-6256
DOI:10.1086/112496