Karl-Heinz Kampert – Univ. Wuppertal Cosmology WS 2006/2007

HIPPARCOS Satellite (1989-1993)Survey of distances of 120 000 stars

24

applet

Karl-Heinz Kampert – Univ. Wuppertal Cosmology WS 2006/2007

Hertzsprung-Russel Diagram

25

Karl-Heinz Kampert – Univ. Wuppertal Cosmology WS 2006/2007

Hertzsprung-Russel Diagram

26

Karl-Heinz Kampert – Univ. Wuppertal Cosmology WS 2006/2007

Observation of Cepheids (ca. 17 Mpc Distance)

m ≈ 24.5m - 25.3m ; periodicity = 51.3 days27

Karl-Heinz Kampert – Univ. Wuppertal Cosmology WS 2006/2007

Properties of Cepheids

28

maximumluminosity

maximumradius

Periodicity (days)

L

umin

osity

(m

agni

tude

s)

Karl-Heinz Kampert – Univ. Wuppertal Cosmology WS 2006/2007

Supernovae 1987a in LMC

before... ... 2 weeks later

29

SN type II(observation of H-lines)

Karl-Heinz Kampert – Univ. Wuppertal Cosmology WS 2006/2007

SN 1987 a decay curve

30

Karl-Heinz Kampert – Univ. Wuppertal Cosmology WS 2006/200731

1998... the year of Supernovae

Karl-Heinz Kampert – Univ. Wuppertal Cosmology WS 2006/200732

Distance Ladder

Karl-Heinz Kampert – Univ. Wuppertal Cosmology WS 2006/200733

Karl-Heinz Kampert – Univ. Wuppertal Cosmology WS 2006/200734

Emission Spectrum @ z=2.3

λ(Lyα) = 1216 Å

1216 Å (1+2.3) = 4013 Å

D =c · z

H0=

300 000 km/s · 2.370 km/s/Mpc

!= 9 860 Mpc

Karl-Heinz Kampert – Univ. Wuppertal Cosmology WS 2006/200735

Redshift in NGC 1357

Emission spectrum

Karl-Heinz Kampert – Univ. Wuppertal Cosmology WS 2006/200736

Redshift in NGC 1357

Δλ/λ=28.3/3933.7=0.0071Δλ/λ=28.7/3968.5=0.0072

Δλ/λ=45.8/6562.8=0.0070

Karl-Heinz Kampert – Univ. Wuppertal Cosmology WS 2006/2007

Hubble Diagram

37

Karl-Heinz Kampert – Univ. Wuppertal Cosmology WS 2006/2007

Hubble Field Distortion

38

Distortion of Hubble-Expansion due to Attraction by the Virgo Cluster