surveys : towards reionisation
DESCRIPTION
Lecture #5. SURVeys : towards reionisation. Observational facts. Lecture plan. Finding galaxies at z>>4 Luminosity Function and SFRD The future. Finding needles in a haystack !. Use the Ly emission Emission line brighter than continuum Seems that Ly drops at z>6 - PowerPoint PPT PresentationTRANSCRIPT
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SURVEYS: TOWARDS REIONISATION
Lecture #5
Observational factsOlivier Le Fèvre – LAM Cosmology Summer School 2014
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Lecture plan
1. Finding galaxies at z>>42. Luminosity Function and SFRD3. The future
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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
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Lyman-break / dropout technique
movie
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Using Lyman- emission
But seems that Ly drops at z>6
Fract
ion L
y
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UDFj-39546284The most distant galaxy confirmed (today !) Detected in H-
band only ! confirmed
Dropout at 1.4 microns
zspec = 8.5549, but controversial
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A tricky business…
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Looking for faint very red smudges
Lyman-break search
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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
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HUDF
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Bouwens+ 2011
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When, how long, and how works the reionisation: bets are open !
Neutral !
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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
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Space telescope Diameter: 6.5m 0.6-25 microns Observe first light Launch 2018
JWST
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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’
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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
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EELT: European Extremely Large Telescope
Construction to be decided in 2013 ?
One of the main goals: find and study the mostdistant galaxies at reionisation
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A bright and busy future for deep surveys !