NUV-i vs. stellar mass relation for the whole HRS galaxy sample. NUV-i colours (in AB system) are corrected for Galactic and internal dust attenuation following Hao et al. (2011). In all panels, green filled dots indicate early-type galaxies (E-S0a). In panel a) spiral galaxies are coded according to their Hi-deficiency parameter (filled dots for Hi − def ≤ 0.4; open circles for Hi − def > 0.4). Black symbols indicate galaxies with available CO data, cyan symbols galaxies with Hi data but never observed in CO (thus lacking in panels b) and c)). In panels b) and c) spiral galaxies are coded according to their H2-deficiency parameter, where the H2 − def has been measured using a constant (panel b)) or a luminosity-dependent (panel c)) XCO conversion factor. Black squares indicate spiral galaxies whose molecular gas content has been determined using aperture corrections, red dots those objects with available CO integrated maps from Kuno et al. (2007). Filled symbols are for galaxies with H2 − def ≤ 0.3, open symbols for objects with H2 − def > 0.3. For the black squares, the H2-deficiency parameter has been determined using the M(H2) vs. Mstar calibration based on all galaxies (lines 3 and 4 in Table 2), for the red symbols the calibration done on the subsample of galaxies with mapped observations from Kuno et al. (2007) (lines 5 and 6 in Table 2).
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