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The radio spectral index is a powerful probe for classifying cosmic radiosources and understanding the origin of the radio emission. Combining data at147 MHz and 1.4 GHz from the TIFR GMRT Sky Survey (TGSS) and the NRAO VLA SkySurvey (NVSS), we produced a large-area radio spectral index map of ~80 percent of the sky (Dec > -40 deg), as well as a radio spectral index cataloguecontaining 1,396,515 sources, of which 503,647 are not upper or lower limits.Almost every TGSS source has a detected counterpart, while this is true onlyfor 36 per cent of NVSS sources. We released both the map and the catalogue tothe astronomical community. The catalogue is analysed to discover systematicbehaviours in the cosmic radio population. We find a differential spectralbehaviour between faint and bright sources as well as between compact andextended sources. These trends are explained in terms of radio galaxyevolution. We also confirm earlier reports of an excess of steep-spectrumsources along the galactic plane. This corresponds to 86 compact andsteep-spectrum source in excess compared to expectations. The properties ofthis excess are consistent with normal non-recycled pulsars, which may havebeen missed by pulsation searches due to larger than average scattering alongthe line of sight.

A radio spectral index map and catalogue at 147-1400 MHz covering 80 per cent of the sky