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Fig. 20

image

150 MHz Euclidean normalized differential source counts as derived from the TGSS ADR1 source catalog (black stars with 1-sigma poissonian error bars), covering the highly complete flux range from 100 mJy to 100 Jy with 20 logarithmic flux bins. Overplotted are various other source counts for this frequency from literature, namely source counts from both a single deep GMRT integration and a larger-area GMRT survey centered on the Boötes field (Intema et al. 2011; Williams et al. 2013, red and magenta dots, respectively), source counts from the 7C survey (McGilchrist et al. 1990; Hales et al. 2007, blue and green dots, respectively), recent source counts from deep, small-area surveys with the LOFAR HBA system (Williams et al. 2016; Mahony et al. 2016; Hardcastle et al. 2016, black, yellow, and gray dots, respectively), and source counts from the MWA GLEAM survey as well as deep, single-pointing MWA survey (Hurley-Walker et al. 2017; Franzen et al. 2016, open triangles and dots, respectively). Some literature points with very large uncertainties have been omitted. Over the flux density range of the plot, the observed source counts can be described by an empirical model as given in Eq. (4) (black solid line, with 1-sigma deviations plotted as dotted lines).

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