Connection with AGN

• M~1e9 galaxies: <20% obscured fraction
• “Eddington ratio” LX/M*
• If M / L = const
• low-M = low-L
• Reality: powerlaw dist.
• Faint: low-M & high-M
• Bright: high-M

Low-mass: only faint

M=1e9

High-mass: bright & faint

M=1e12

Aird+12