Hubble clarity Groundbased Hubble Outline Dissecting nearby galaxies
Hubble clarity Groundbased… Hubble…
Outline Dissecting nearby galaxies Studying galaxies when they were young What makes sense, and what doesn’t?
Movie – 030651 b
Dissecting nearby galaxies Star by star
Movie – supermovie
zoom 2
Brown et al. 2003, Ap. J, 592,
Brown et al. 2003, Ap. J, 592,
Brown et al. 2003, Ap. J, 592,
Brown et al. 2003, Ap. J, 592,
Brown et al. 2003, Ap. J, 592,
SFR with 2 distinct pops
Movie – 2002 -09 -a-low
Movie – movie_mred 3 hr
Studying galaxies when the universe was young…
Where’s the kaboom? There was supposed to be an earth-shattering kaboom!
Spectra Brightness Redshift Wavelength
Vesto Slipher Galaxies are generally receding Edwin Hubble …in proportion to their distance from us
The best things take time… 6 hours 200 hours
Color Selection of Distant Galaxies Distant star-forming galaxies can be identified by a characteristic “spectral break” due to hydrogen.
Age vs. redshift HDF spectroscopicall y confirmed sample: – Sample spans 1. 5 billion years, yet we see no evidence of aging.
Implications for Galaxy Evolution Dickinson, Papovich, Ferguson, & Budavari 2003 GOODS; Papovich et al. 2004
Fraction of the universe in stars Stars, as a fraction of the universe 13. 7 Age of the universe (in billions of years) 987 6 5 4 3 2. 5 2 Redshift Wilkins, Trentham & Hopkins 2008 1. 6 1
Cosmic star-formation rate 9 8 7 6 5 4 3 Number of stars formed per year 13. 7 Redshift Wilkins, Trentham & Hopkins 2008 2. 5 2 1. 6
Things that hold together Galaxies appear to be built up via hierarchical merging This is broadly consistent with theoretical models. Worries Where do the stars that formed 10 billion years ago end up, today? Are galaxies ageing in the way they ought to? Are there too many old galaxies when the universe was young?
Coming attractions
HUBBLE MISSIONS SM 4 De-Orbit Mission SM 3 B SM 3 A Advanced Camera Solar Arrays Power Control Unit NICMOS Cooling System SM 2 Gyros Advanced Computer Fine Guidance Sensor SM 1 Launch! Cosmic Origins Spectrograph Wide Field Camera 3 Fine Guidance Sensor Aft Shroud Cooling System Batteries Gyros Imaging Spectrograph Near Infrared Camera Fine Guidance Sensor Wild Field Planetary Camera 2 COSTAR Gyros Solar Arrays 1990 1993 1997 1999 2002 2006 2010 051304_MW_HSTRobotic. Concept. ppt 60
Adding WFC 3 Capabilities – Imaging from 2000 Å to 1. 7 m – Slitless spectroscopy Near-IR Huge improvement in near-UV, near -IR imaging WFC 3 UV/Optical Discovery Space Near-IR Discovery Space Ultraviolet
COS
James Webb Space Telescope 2013
- Slides: 64