local universe milky way galactic archaeology: …chiba/lecture/ga2019/...stellar mass density...

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ඕᎋӞܖ: ᡈඕܬܢƔǒǔඕӪ Galactic Archaeology: Deciphering formation histories of galaxies from the local universe Ҙᓶ௺Ӯ ᲢிܖٻMasashi Chiba (Tohoku Univ) 1 https://www.astr.tohoku.ac.jp/~chiba/lecture/GA2019/index.html Milky Way Andromeda Sendai Local Universe Our Galaxy ƷឋэඕኒƷƱᡶ 3 ܬܢƷᄂᆮ ᲢಮŷƳඕ Ʒ ǹ ǹȊȃȗǷȧȃȈᲣ ܬܢƷኒ Ტҥɟඕ Ʒ ޒƷᡙᲣ Bekki & Chiba 2001 ඕƷƱᡶ Ⴛᙀႎ 4

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Page 1: Local Universe Milky Way Galactic Archaeology: …chiba/lecture/GA2019/...Stellar Mass Density evolution Milky Way & Galactic satellites 10 Local Group 11 HST photometry of LG galaxies

:

Gal

actic

Arc

haeo

logy

:D

ecip

herin

g fo

rmat

ion

hist

orie

s of

ga

laxi

es fr

om th

e lo

cal u

nive

rse

Mas

ashi

Chi

ba(T

ohok

u U

niv)

1ht

tps:

//ww

w.as

tr.to

hoku

.ac.

jp/~

chib

a/le

ctur

e/G

A20

19/in

dex.

htm

l

Milk

y W

ay

And

rom

eda

Sen

dai

Loca

l Uni

vers

e

Our

Gal

axy

3

Bek

ki &

Chi

ba 2

001

4

Page 2: Local Universe Milky Way Galactic Archaeology: …chiba/lecture/GA2019/...Stellar Mass Density evolution Milky Way & Galactic satellites 10 Local Group 11 HST photometry of LG galaxies

•Ph

otom

etry

•Sp

ectro

scop

y

•As

trom

etry

5

inne

r hal

o

oute

r hal

o

glob

ular

clu

ster

halo

star

thic

k di

sk

Thin

dis

k

: a

ge <

10

Gyr

Thic

k di

sk, H

alo

: age

> 1

0 G

yrB

ulge

:

age

~ 1

0 G

yr

bulg

e

6

TO

RG

BH

BA

GB SG

V

BV

BS

MS

7

Foss

il re

cord

s of

gal

axy

form

atio

nG

alac

tic A

rcha

eolo

gy8

Page 3: Local Universe Milky Way Galactic Archaeology: …chiba/lecture/GA2019/...Stellar Mass Density evolution Milky Way & Galactic satellites 10 Local Group 11 HST photometry of LG galaxies

9

Cos

mic

sta

r for

mat

ion

hist

ory

Mad

au &

Dic

kins

on (2

014)

Star

For

mat

ion

Rat

e D

ensi

ty e

volu

tion

Stel

lar M

ass

Den

sity

evo

lutio

n

Milk

y W

ay &

Gal

actic

sate

llite

s

10

Loca

l Gro

up

11

HS

T ph

otom

etry

of L

G g

alax

ies

12

Page 4: Local Universe Milky Way Galactic Archaeology: …chiba/lecture/GA2019/...Stellar Mass Density evolution Milky Way & Galactic satellites 10 Local Group 11 HST photometry of LG galaxies

Leo

I (dS

ph)

13

Stre

am

Nor

ther

n Sp

ur

G1

Clu

mp

M32

And

rom

eda

Gal

axy

Sub

stru

ctur

e in

M31

’s h

alo

(Fer

guso

n et

al.

2002

)

14

AC

S/H

ST p

hoto

met

ry o

f M31

’s h

alo

(usi

ng 1

20 H

ST o

rbits

!)

V=3

0mag

V=2

8mag

15

Hal

o re

aliz

atio

n 1

1616

Hal

o fo

rmat

ion

mod

el (B

ullo

ck &

Joh

nsto

n 20

05)

mer

ging

tree

+ s

emi-a

naly

tic g

alax

y fo

rmat

ion

Page 5: Local Universe Milky Way Galactic Archaeology: …chiba/lecture/GA2019/...Stellar Mass Density evolution Milky Way & Galactic satellites 10 Local Group 11 HST photometry of LG galaxies

Out

line

1. 2. 3. 4. 5. 6.

17

•G

alac

tic D

ynam

ics

(200

8) b

y B

inne

y &

Tr

emai

ne (P

rince

ton)

•N

ucle

osyn

thes

is a

nd C

hem

ical

Evo

lutio

n of

G

alax

ies

(199

7) b

y P

agel

(Cam

brid

ge)

•Ev

olut

ion

of S

tars

and

Ste

llar P

opul

atio

ns

(200

5) b

y S

alar

is &

Cas

sisi

(Wile

y)•

,,

()

•G

alac

tic A

rcha

eolo

gy20

15by

18