Astronomy 2022A/B Lecture Notes - Lecture 5: Baryon, Spiral Galaxy, Elliptical Galaxy

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Lecture 5 – The Riddle of Dark Matter
Matter: more than one kind?

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
!"#
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&
o'%&
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
The theory side: Big Bang Nucleosynthesis
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
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" 
/0"
 -
%&12
BBN
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3
  
"
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Does BBN’s prediction stack up to reality?
5"
6*.
2*
7(

o$
(4((!8
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;
o,
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o3%&<,
= ,
,= ,
There’s a catch though
3*
+(4((#54((#
5+%
>?&
.*!
=%
?&
?
#
Dark Matter (DM)
@
%&
=
@A
= 
5
?#
B?#
The dusty universe
$
8
@%1&

.

#
Dark matter and gravity
.
8!
Looking for DM in galaxies
3A5%6&

CD
3
'-@A#
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Spiral Galaxies
$==

CA5
=?
Rotation Curves of Galaxies
1%@!&
=
EF=

G=-

1) Weighing the Galaxies
%
3&
=
.
Rotation Curves
H@A
5=
oI

:,?;J?
/
3=K
Compare to Solar System
333
.
Mass of the milky way
E==
% &
o K
Extra mass in galaxies
50
=)16(==
=-

?I=
%&
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