S22A0093
S22A0093
We have performed z ∼ 2 LAE survey for the fields traced by groups of strong intergalactic Hi Lyα absorption on a scale of 15 h−1cMpc, by using the Subaru/HSC NB387/NB400. However, as a resonant line, Lyα emission can be suppressed by the radiative transfer processes or extincted by the dust, so it is crucial to test the effectiveness of the LAEs as the mass tracer. Hα emitter (HAE) is a good alternative, given that the emission is not resonant and unlikely affected by the scatter of intergalactic Hi. The distant red galaxy (DRG) selected based on the Balmer/4,000 Å breaks is another ideal choice, since it is a distinctive galaxy population with massive stellar mass, and it is also free from dust extinction. We propose to use the SWIMS NB2167 + Ks in red channel to detect the HAEs with z∼2.3, matching up the HSC/NB400-Lyα, and simultaneously, to use the J1 + J2 + Paβ-off in the blue channel to identify DRGs at the similar redshift. We target a region with a moderate number of LAEs, but rich in IGM Hi as suggested by the concentrating sightlines with strong IGM absorption. By comparing the distributions and properties among LAEs, HAEs, and DRGs in such a unique environment, we will deepen our understanding on how galaxies work as the tracers of underlying structures.
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