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SURVeys : towards reionisation

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

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SURVeys : towards reionisation

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  1. Lecture #5 SURVeys: towardsreionisation Observationalfacts Olivier Le Fèvre – LAM CosmologySummerSchool 2014

  2. Lecture plan • Finding galaxies at z>>4 • LuminosityFunction and SFRD • The future

  3. Findingneedles 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

  4. Lyman-break / dropout technique movie

  5. UsingLyman- emission But seems that Ly drops at z>6 Fraction Ly

  6. UDFj-39546284The most distant galaxyconfirmed (today !) • Detected in H-band only ! • confirmed • Dropout at 1.4 microns • zspec= 8.5549, but controversial

  7. A tricky business…

  8. Looking for faintveryredsmudges Lyman-break search

  9. Mostly HST business LF Z~4 Z~5 Z~6 • ACS and WFC3 cameras cover B band to H band • Variousdeepfields • HDF • HUDF • XDF • … Bouwens+ 2007

  10. HUDF

  11. Bouwens+ 2011

  12. When, how long, and how works the reionisation: bets are open ! Neutral !

  13. The exploration withgalaxysurveyswill continue • All wavelength • Extremesensitivitiesmag_AB>30 • All sky ultra-deep • Large samples • ALMA (sub-mm) • JWST (IR) • EELT (visible+NIR) • Ultra-Deep • EUCLID (visible+NIR) • All-sky

  14. JWST • Spacetelescope • Diameter: 6.5m • 0.6-25 microns • Observe first light • Launch 2018

  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 spacecosmology mission for the nextdecade • Selected by ESA in Oct.2011 • Launch 2020 • Goals: understand the nature of darkmatter and darkenergy

  17. EELT: EuropeanExtremely Large Telescope One of the main goals: find and study the most distant galaxies atreionisation Construction to bedecided in 2013 ?

  18. A bright and busy future for deepsurveys !

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