Chang-Goo's Talk Title and Abstract:
Self-regulation
of
star
formation
rates
and
launching
of
multiphase
galactic
winds
from
first
principles
simulations
Abstract:
Developing
a
theoretical
understanding
of
star
formation
and
galactic-scale
winds
from
first
principles
is
the
major
hurdle
to
build
a
truly
predictive
galaxy
formation
theory.
Stars
are
born
in
the
interstellar
medium
(ISM)
as
a
consequence
of
the
competition
between
gravity
and
turbulent,
magnetic,
and
thermal
pressure
forces.
At
the
same
time,
newly-born
massive
stars
return
copious
amounts
of
energy
to
the
ISM
(so
called
stellar
feedback),
which
is
the
major
energy
source
heating
and
stirring
the
ISM
and
driving
large
scale
outflows.
I
will
present
a
recent
breakthrough
in
developing
first-principles
simulations
of
the
star-forming
ISM
that
includes
a
self-consistent
treatment
of
the
ISM
thermodynamical
evolution
in
galactic
disks
by
solving
(radiation)magnetohydrodynamics
with
self-gravity,
star
formation,
and
feedback.
In
the
TIGRESS
(Three-phase
ISM
in
Galaxies
Resolving
Evolution
with
Star
formation
and
Supernova
feedback)
framework,
we
include
key
physical
processes
in
a
local,
vertically-stratified,
shearing-box
(outer
scale
~
kpc)
with
uniformly
high
resolution
(~
pc).
Our
TIGRESS
simulation
suite
covers
a
wide
range
of
galactic
conditions
with
each
simulation
run
for
enough
time
(>
galactic
rotation
period)
to
provide
self-consistently
regulated
ISM
states,
star
formation
rates,
and
multiphase
outflow
properties.
I
will
explain
how
this
set
of
simulations
provides
the
perfect
testbed
to
illuminate
the
emerging
mutual
correlations
between
SFR,
outflow
rates,
and
galactic
properties.