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 !