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ON THE CGM FUNDAMENTAL PLANE: THE HALO MASS DEPENDENCY OF CIRCUMGALACTIC H I

We analyze the equivalent widths of H I Lyα (WLyα) absorption from the inner (R< 160 kpc) circumgalactic medium (CGM) of 85 galaxies at z∼ 0 with stellar masses M∗ ranging 8≤ logM∗/M ≤ 11.6. Across three orders of magnitude in stellar mass, the CGM of present-day galaxies exhibits a very high covering fraction of cool hydrogen gas ( fC = 87± 4%) indicating that the CGM is ubiquitous in modern, isolated galaxies. When H I Lyα is detected, its equivalent width declines with increasing radius regardless of the galaxy mass, but the scatter in this trend correlates closely with M∗. Using the radial and stellar mass correlations, we construct a planar surface describing the cool CGM of modern galaxies: logW s HI1215 = (0.34±0.02)− (0.0026±0.0005)× (R)+ (0.286±0.002)× log(M ∗/M ). The RMS scatter around this bivariate relation is∼0.2 dex. We interpret the explicit correlation between WLyα and M∗ to arise from the underlying dark matter halo mass (Mhalo), thereby suggesting a CGM fundamental plane between WLyα, R and Mhalo. This correlation can be used to estimate the underlying dark matter halo mass from observations of saturated H I Lyα in the CGM of a modern galaxy. Subject headings: galaxies: halos — quasars: absorption lines — intergalactic medium