Table 1
Spectral properties of sources in the NVSS/GB6 sample.
| Flux density | Steep | Flat(+Inverted) | Inverted | ||||||||
| (mJy) | Ntot | N | median | αpeak | σα | N | median | αpeak | σα | N | |
|
|
|||||||||||
| [100, 158) | 3832 | 2662 | –0.87 | –0.87 | 0.15 | 1170 | –0.14 | –0.39 | 0.38 | 167 | |
| [158, 251) | 2068 | 1335 | –0.87 | –0.86 | 0.14 | 733 | –0.11 | –0.29 | 0.37 | 103 | |
| [251, 400) | 1125 | 657 | –0.85 | –0.86 | 0.14 | 468 | –0.09 | –0.17 | 0.30 | 61 | |
| ≳ 400 | 1102 | 498 | –0.81 | –0.81 | 0.14 | 604 | –0.03 | –0.14 | 0.40 | 117 | |
Notes. For each flux density range the columns indicate the total number of sources, the number of steep- and flat-spectrum (+inverted) sources, and the median values of their corresponding spectral index distributions; in the last column, the number of inverted-spectrum sources (α ≥ 0.3) is also given. αpeak and σα indicate the parameters of the best-fit truncated Gaussians for steep- and flat-spectrum sources (see Sect. 3.2).
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