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Fig. A.1

image

Color images from the SDSS and 21-cm H i line spectra of the galaxies clearly detected at Nançay. The size of each image is 3′.5×3′.5 (i.e., the E–W HPBW of the Nançay Radio Telescope). Each image is centered on the position of the selected photometric source whose properties are listed in Table 1, the white + sign indicates the pointing center of the Nançay Radio Telescope, the magenta cross indicates the position of the selected SDSS spectroscopic source whose properties are listed in Table 1, and the crosses of various other colors indicate the positions of the other SDSS spectroscopic positions within the boundaries of the image. Indicated along the top of each image are (from left to right) the NIBLES catalog number of the target galaxy (see Table 1), its absolute magnitude in the z-band, Mz, and the logarithm of its total H i mass, log(MH I) (in M), while indicated in the lower left are the color-coded optical velocities of the SDSS spectroscopic sources in the image. The scale along the horizontal axes of the H i spectra is heliocentric radial velocity (cz) in km s-1, and the vertical scale is flux density in mJy. Indicated in each spectrum are the central H i velocity (blue triangle) and the W50 width of the profile, and the SDSS velocity of the selected spectroscopic source (dashed magenta vertical line) and the other sources in the image (dashed lines in colors corresponding to those of the crosses in the image). The velocity resolution is 18 km s-1.

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