Lecture #5 Observational facts Olivier Le Fèvre – LAM Cosmology Summer School 2014.
-
Upload
nicholas-alexander -
Category
Documents
-
view
219 -
download
4
Transcript of Lecture #5 Observational facts Olivier Le Fèvre – LAM Cosmology Summer School 2014.
SURVEYS: TOWARDS REIONISATION
Lecture #5
Observational factsOlivier Le Fèvre – LAM Cosmology Summer School 2014
Lecture plan
1. Finding galaxies at z>>42. Luminosity Function and SFRD3. The future
Finding needles in a haystack ! Use the Ly emission
Emission line brighter than continuum Seems that Ly drops at z>6
Use “dropout” technique Based on continuum properties The “Lyman-break” generalized
Lyman-break / dropout technique
movie
Using Lyman- emission
But seems that Ly drops at z>6
Fract
ion L
y
UDFj-39546284The most distant galaxy confirmed (today !) Detected in H-
band only ! confirmed
Dropout at 1.4 microns
zspec = 8.5549, but controversial
A tricky business…
Looking for faint very red smudges
Lyman-break search
Mostly HST business
ACS and WFC3 cameras cover B band to H band
Various deep fields HDF HUDF XDF …
LFZ~4Z~5Z~6
Bouwens+ 2007
HUDF
Bouwens+ 2011
When, how long, and how works the reionisation: bets are open !
Neutral !
The exploration with galaxy surveys will continue
All wavelength Extreme
sensitivities mag_AB>30
All sky ultra-deep
Large samples
ALMA (sub-mm) JWST (IR) EELT (visible+NIR)
Ultra-Deep
EUCLID (visible+NIR) All-sky
Space telescope Diameter: 6.5m 0.6-25 microns Observe first light Launch 2018
JWST
15
JWST instruments
NIRCAM: 0.6-5 microns 2.2’x4.4’
NIRSPEC: 1-5 microns 3’x3’ Multi-slit
MIRI: 5 to 27 microns Imaging and
spectroscopy 1.3’x1.7’
16
The ESA-Euclid space mission The major space
cosmology mission for the next decade
Selected by ESA in Oct.2011
Launch 2020 Goals: understand
the nature of dark matter and dark energy
EELT: European Extremely Large Telescope
Construction to be decided in 2013 ?
One of the main goals: find and study the mostdistant galaxies at reionisation
A bright and busy future for deep surveys !