S20A0119abst

S20A0119

While recent observations revealed the ubiquity of giant Lyα nebulae around luminous QSOs at z∼3, no direct evidence of gas floating in filaments (gas well beyond the halo virial radii) has been reported, which should play a fundamental role in the widely accepted cold accretion scenario. We propose Keck/KCWI observations of a diffuse Lyα nebula, a candidate of such filament gas illuminated by a hyperluminous QSO found in our past deep HSC narrow-band data. This nebula, called “the filament”, has a number of characteristics suggestive of cold streams. Thus we modelled this nebulae assuming it represents cold filament gas, and will test if this is true by analyzing the spatially resolved Lyα line to derive N_HI and LOS velocity of the emitting cloud, which should be very different from the Lyα line from normal star forming galaxies. This program will bring a significant progress toward the understanding of the whole picture of galaxy formation and evolution by establishing the cold accretion scenario.

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