32_-_Top_Hat_Galaxy_Formation - 32 - Top Hat Galaxy...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
32 - Top Hat Galaxy Formation 2 Objectives • Trace the formation of galaxies – Small perturbations in the Early Universe grow into small galaxies. – They grow up to be massive galaxies. – These early galaxies change their environment. • Along the way comes the Lyman Forest. 3 The problem: how and when did the large galaxies form? • Prior to recombination, the fluctuations in the CMB and the baryon density were about • Today the matter density fluctuations represented by large galaxies are ~10 12 times larger than CMB fluctuations. • What caused the huge “compaction” of matter? Ans. Gravity 4 4” ~ Kunth et al. 2003 SBS0335-052 HST WFPC2/F791w 3” ~ 750pc A real galaxy in the sky.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
5 0.024 pc or 5kAu A. Loeb astro-ph/0603360 Simulated sky in a computer! 6 Is it real, or is it fake? It’s fake. 7 From Avi Loeb The Here and Now! The Beginning. Names in () are NASA Missions or ground based programs! Too hot to be Hydrogen Cooled by expansion First stars form reionized 8 EVENT z Recombination (T ~ 3000K & N H ~ N p ) 1000 High density cores collapse, stars form, and reionization begins 11 Reionization is complete 7 First galaxies are forming 7 to 3 Massive galaxies appear 3 Peak star formation 2 Cluster formation 1 Today 0 In terms of redshift
Background image of page 2
9 Fluctuations today: δ T/T or δρ / ρ • CMB δ T/T ~ 10 -6 • Virgo Cluster δρ / ρ 1x10 3 • Milky Way δρ
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 7

32_-_Top_Hat_Galaxy_Formation - 32 - Top Hat Galaxy...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online