Introduction to Cosmology

90 °

6000

5000

4000

3000

Dℓ

[μ

K

2 ]

2000

1000

0

2 10 50 500 1000

Multipole moment, ℓ

1500 2000 2500

18 ° 1 ° 0.2°

Angular scale

0.1° 0.07°

Figure 8.3 The best-fit power spectra of CMB temperature (T) fluctuations as a function
of angular scale (topxaxis) and multipole moment (bottomxaxis) [6]. Reproduced from
the freely accessible Planck Legacy Archive with permission of Jan Tauber, European Space
Agency.