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Fig. 12


Total H i mass, MH I (in M), as a function of radial velocity (in km s-1) – as in Fig. 11. Shown besides the NIBLES detections and marginals are the ALFALFA data from Haynes et al. (2011), where green squares represent high-quality (Category 1) detections, and blue ones the weaker (Category 2) ones. The H i masses of the ALFALFA detections were calculated in the same way as for the NIBLES sources, using simply a distance of D = V/H0, where the adopted Hubble constant is H0 = 70 km s-1 Mpc-1. For clarity, the velocity range plotted is limited to the NIBLES search range limit of 12 000 km s-1, whereas the ALFALFA search range continues till 18 000 km s-1. The green vertical arrow left of the legend of 0.16 dex in log (MH I) indicates the difference between the on average 1.45 higher ALFALFA α.40 catalog fluxes and the NIBLES values (see Sect. 4.6).

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