The effect of the environment on the HI scaling relations

Understand

We use a volume-, magnitude-limited sample of nearby galaxies to investigate the effect of the environment on the HI scaling relations.

• We confirm that the HI-to-stellar mass ratio anti correlates with stellar mass, stellar mass surface density and NUV-r colour across the whole range of parameters covered by our sample (10^9 <M*<10^11 Msol, 7.5 <mu*<9.5 Msol kpc^-2, 2<NUV-r<6 mag).
• These scaling relations are also followed by galaxies in the Virgo cluster, although they are significantly offset towards lower gas content.
• Interestingly, the difference between field and cluster galaxies gradually decreases moving towards massive, bulge-dominated systems.