Planck Planck & & The Epoch of Reionization The Epoch of - PowerPoint PPT Presentation

Planck Planck & & The Epoch of Reionization The Epoch of Reionization Marian Douspis Marian Douspis Institut d'Astrophysique Spatiale Orsay, France M. Douspis (IAS) Cosmological Reionisation, 2010/02/16 , Allahabad

Outline • Planck status • Planck and EOR • EOR with Planck and 21cm M. Douspis (IAS) Cosmological Reionisation, 2010/02/16 , Allahabad 2

Planck Status 14 May 2009 Point de Lagrange L2 dans l’ombre de la Terre M. Douspis (IAS) Cosmological Reionisation, 2010/02/16 , Allahabad 3

Planck Status ➢ All stages are very stable ➢ Sensitivity is as expected M. Douspis (IAS) Cosmological Reionisation, 2010/02/16 , Allahabad 4

Planck first light ➢ From August 11 th to 26 t h : First Light Survey ➢ From August 26 th : Survey routine mode Press release, ESA/HFI/LFI 17/09/2009 (credit:ESA, LFI&HFI consortium (Planck) Background image: Axel Mellinger) M. Douspis (IAS) Cosmological Reionisation, 2010/02/16 , Allahabad 5

Planck first light Press release, ESA/HFI/LFI 17/09/200 M. Douspis (IAS) Cosmological Reionisation, 2010/02/16 , Allahabad 6

Planck Status From of August 26 th : Survey routine mode Today : end of the First Survey (96% of the sky) / 5 possible Wmap map M. Douspis (IAS) Cosmological Reionisation, 2010/02/16 , Allahabad 7

Planck and EOR • In CMB studies: – instantaneous reionisation usually assumed – reionisation effects often summarised with one τ optical depth parameter : • 2 main effects – Damping small scales in Temperature Damping small scales in Temperature – Bump and damping in Polarisation Bump and damping in Polarisation • Other weak small scales effects Other weak small scales effects M. Douspis (IAS) Cosmological Reionisation, 2010/02/16 , Allahabad 8

Planck and EOR (T) • Damping by exp(-2 τ ) M.D. Spergel et al. 2003 WMAP 1 • Degeneracies with n s & Ω b h 2 if T only M. Douspis (IAS) Cosmological Reionisation, 2010/02/16 , Allahabad 9

Planck and EOR (P) • Break degeneracies on τ Break degeneracies on τ M.D. Planck BlueBook • Extra information from Extra information from shape of bump on history shape of bump on history of reionization of reionization (Kaplinghat et al 03, Hu & Holder 03) M. Douspis (IAS) Cosmological Reionisation, 2010/02/16 , Allahabad 10

Planck and EOR • More info than τ is maybe available – Reconstruction of the ionisation fraction x e – Reconstruction of the visibility function If instantaneous reionisation is assumed - Visibility function M. Douspis (IAS) Cosmological Reionisation, 2010/02/16 , Allahabad 11

Planck and EOR Ionisation fraction in bins Ionisation fraction in bins CVL Planck Planck+P Lewis Weller Battye 06 M. Douspis (IAS) Cosmological Reionisation, 2010/02/16 , Allahabad 12

Planck and EOR Ionisation fraction in Principal Component Analysis Ionisation fraction in Principal Component Analysis Hu & Holder 03 CVL CVL Eigenvectors Eigenvectors CVL CVL Eigenvalues Eigenvalues Planck Planck Mortonson & Hu 08 Weller & Battye, ongoing work in Planck WG5 M. Douspis (IAS) Cosmological Reionisation, 2010/02/16 , Allahabad 13

Planck and 21cm CMB photons scatter off ionised bubbles produced @ the EoR secondary CMB anisotropies thermal SZ effect, kinetic SZ effect kinetic SZ effect & imprint on polarisation kSZ – EoR map “should” anti-correlate ≅ ≅ 1 – n e n H n 1 – n e H Anti-correlation ! Anti-correlation ! EoR EoR KSZ KSZ map map map map δT E ~ n H δT R ~ n (δT/T) k ~ n e (δT/T) Z ~ n E o H o R k S e S Z 21-cm experiments (e.g. 21CMA, LOFAR, MWA & SKA) M. Douspis (IAS) Cosmological Reionisation, 2010/02/16 , Allahabad 14

Planck & 21cm Secondary anisotropies from Kinetic SZ Secondary anisotropies from Kinetic SZ Cross-correlation Cross-correlation 21cm-CMB (P & T) 21cm-CMB (P & T) theoretical approach + simulations { { Absorb 21cm line from CMB for T T c > T g Absorb 21cm line from CMB for b > T cm transitions of HI 21 cm transitions of HI 21 c m g m b Emit 21cm line to CMB for T g > T c Emit 21cm line to CMB for T g > T c m m b b M. Douspis (IAS) Cosmological Reionisation, 2010/02/16 , Allahabad 15

21cm – CMB (T) - theo. Signal to Noise ratio analysis @ large scale (Tashiro et al. 2008, 2009) • CMB noise – Primordial CMB+planck noise • 21cm noise – Experimental noise: (∆ z=0.01, z re =10, z o s =10) b Signal stronger for short reionisation. M. Douspis (IAS) Cosmological Reionisation, 2010/02/16 , Allahabad 16

21cm – CMB (T) - simu. Coherent simulations LOFAR LOFAR EoR EoR Jelic et al. 2009 Thomas et al 2008 Stars Planck Planck kSZ kSZ C(0) = -0.16 ± 0.02 (without primary CMB) C(0) = 0.0 ± 0.3 (with primary CMB = noise) CMB is the main noise for cross-correlation at small scale M. Douspis (IAS) Cosmological Reionisation, 2010/02/16 , Allahabad 17

Conclusions • First order effects (bump & damping) will be well measured by Planck leading to strong constraints on τ • Reionisation history will be harder to determine in detail (3-4 indep. components) • Cross correlation with 21cm may be helpful but really hard (few σ for LOFAR now, better with SKA soon) • Planck is starting its 2 d survey of the sky M. Douspis (IAS) Cosmological Reionisation, 2010/02/16 , Allahabad 18