"Lyman Alpha Emitters and their Roles in Galaxy Formation"
Masami Ouchi, University of Tokyo, ICRR (Tinlsey Visiting Scholar)
I present observational results from
recent Lya emitter (LAE) studies, and
discuss a physical origin of LAEs
and a connection with other high-z galaxies.
I compare LAEs with other high-z populations
in various observational properties such as
stellar populations, clustering, metal abundance,
and gas kinematics, and highlight how LAEs
occupy an important place in galaxy formation.
At the end of my talk, I introduce the forthcoming
large LAE surveys, specifically our on-going
program of Subaru/Hyper Suprime-Cam survey
that increases sizes of LAE samples by
a factor of 10-100 at z=2-7.
"Gas Around Galaxies - HVCs and the Lyalpha Forest"
Bart Wakker, University of Wisconsin, Madison
Recent progress in cosmological simulations has led to a more
general dissemination of the idea that galaxies grow by both
hot and cold-mode accretion. Directly observing these flows has
remained difficult. but what happens in the final stages
of the accretion processes may be observable through studies of
the high-velocity clouds and gas in the Milky Way halo. I will
present new results on the distances and metallicities and orbits
of these objects and show how they provide evidence for the infall
of low-metallicity gas onto the Milky Way. I will further discuss
some data concerning the reservoir of gas that these clouds come
from and what this tells us about galaxy halos and the Cosmic Web.