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AT seminar by Christoph Pfrommer on 16.62017

Understanding

...

the

...

physics

...

of

...

galaxy

...

formation

...

is

...

an

...

outstanding

...

problem

...

in

...

modern

...

astrophysics.

...

Recent

...

cosmological

...

simulations

...

have

...

demonstrated

...

that

...

feedback

...

by

...

star

...

formation,

...

supernovae

...

and

...

active

...

galactic

...

nuclei

...

appears

...

to

...

be

...

critical

...

in

...

obtaining

...

realistic

...

disk

...

galaxies

...

and

...

to

...

slow

...

down

...

star

...

formation

...

to

...

the

...

small

...

observed

...

rates.

...

However

...

the

...

particular

...

physical

...

processes

...

underlying

...

these

...

feedback

...

processes

...

still

...

remain

...

elusive.

...

In

...

particular,

...

these

...

simulations

...

neglected

...

magnetic

...

fields

...

and

...

relativistic

...

particle

...

populations

...

(so-called

...

cosmic

...

rays).

...

Those

...

are

...

known

...

to

...

provide

...

a

...

pressure

...

support

...

comparable

...

to

...

the

...

thermal

...

gas

...

in

...

our

...

Galaxy

...

and

...

couple

...

dynamically

...

and

...

thermally

...

to

...

the

...

gas,

...

which

...

seriously

...

questions

...

their

...

neglect.

...

After

...

introducing

...

the

...

underlying

...

physical

...

concepts,

...

I

...

will

...

present

...

our

...

recent

...

efforts

...

to

...

model

...

cosmic

...

ray

...

physics

...

in

...

galaxy

...

formation.

...

I

...

will

...

demonstrate

...

that

...

cosmic

...

rays

...

play

...

a

...

decisive

...

role

...

on

...

all

...

scales

...

relevant

...

for

...

the

...

formation

...

of

...

galaxies,

...

from

...

individual

...

supernova

...

remnants

...

up

...

to

...

scales

...

relevant

...

for

...

entire

...

galaxies.

...

Finally,

...

I

...

will

...

discuss

...

the

...

non-thermal

...

radio

...

and

...

gamma-ray

...

emission

...

of

...

Milky-Way

...

like

...

galaxies

...

and

...

how

...

the

...

next-generation

...

instruments

...

such

...

as

...

the

...

Cerenkov

...

Telescope

...

Array

...

(CTA)

...

can

...

be

...

used

...

to

...

infer

...

properties

...

relevant

...

for

...

galaxy

...

formation.