Strategic Planning for 21cm Cosmology Albert Stebbins - - PowerPoint PPT Presentation
Strategic Planning for 21cm Cosmology Albert Stebbins Fermilab, Batavia, USA Astrophysics Mini-Retreat B 20 April 2018 3D Cosmology
Albert Stebbins Fermilab, Batavia, USA Astrophysics Mini-Retreat B 20 April 2018
dark energy
galaxies reionization Dark Ages CMB CHIME HIRAX HERA HERA DESI 1 10 100 1000
Observable Universe
2D: CMB [CMB-3G/S4] galaxy imaging 2D: single band imaging [APM] 2D+: + multi-band photo-z’s [DES/LSST] 3D-: + lo-res spectroscopy [PAU/MKIDS] 3D: + hi-res spectroscopy [DESI]
area ∝ volume
GBT CHIME Tianlai PF OWFA HIRAX SKA-MID
stage 1 post reionization 0 < z < 2 stage 2 post reionization 2 < z < 6 stage 3 dark ages 30 < z < 150 context 2018-2020
data taking construction 1st results community building
LSST/DESI ongoing stage 1 first results decadal survey submission
2020-2025
stage 1 results
R&D based on stage 1 simulations firm up science case
LSST / DESI / stage 1 P5 submission Decadal Survey results P5 results SKA online
2025-2030
continuation?
collaboration forming CD0/CD1 LSST/DESI ending SKA results
2030-2035
construction start of data taking feasibility study preliminary design
? 2035-2040
data taking analysis construction start of data taking
? 2040-2045
data taking analysis
?
DOE21 “Cosmic Visions Dark Energy: 21-cm Roadmap” Slosar & co.
2 < z < 6 (200-500 MHz)
bandwidth smaller than CHIME/HIRAX
256 x 256 array 6m dishes
64 x HIRAX
dual polarization feeds close packed
~ 1.5 km2 (very different design than SKA)
highly redundant baseline correlator
FFT (n log n) or direct summation (n3/2) learn from HIRAX
radial resolution ~3kHZ
~ HIRAX
DOE21 “Cosmic Visions Dark Energy: 21-cm Roadmap” Slosar & co.
Total S/N in the power spectrum DESI limited by the number density of sources LSST by the precision of photometric redshifts. 21cm-S2 looses sensitivity at low-k due to foreground contamination but has most volume and most accurate sampling.
de Oliveira-Costa et al. 2008
versus ~102μK! prediction: this will be worked out by 2020
1 2 3 4 5 6 7 z 10 20 30 40 distance/rd √z
DM(z)/rd √z DV (z)/rd √z zDH(z)/rd √z current generation DESI EUCLID WFIRST 21-cm
angular radial
DOE21 “Cosmic Visions Dark Energy: 21-cm Roadmap” Slosar & co.
DOE21 “Cosmic Visions Dark Energy: 21-cm Roadmap” Slosar & co.
DOE21 “Cosmic Visions Dark Energy: 21-cm Roadmap” Slosar & co.
Sandage Effect: Could we directly detect cosmic (de)acceleration?
5 year redshift drift
DOE21 “Cosmic Visions Dark Energy: 21-cm Roadmap” Slosar & co.
10 20 50 100 200 500 1000 2000 5000 10-7 10-6 10-5 10-4 10-3 10-2 10-1 b @kmD
From tidal fossils From curl lensing
scalar-induced vector modes Floor set by scalar-induced tensor modes Floor set by Moon diameter
DOE21 “Cosmic Visions Dark Energy: 21-cm Roadmap” Slosar & co.
1
Daniel Charlet TWEPP-2017
NumEriseur à Bande Large pour l’Astronomie
Wide band digitizer for radioastronomy
Daniel Charlet1,Cedric Viou2
1 : Laboratoire de l'Accélérateur Linéaire Université Paris XI, 91898 Orsay 2 : Station de Radioastronomie de Nançay, Observatoire de Paris, PSL Research University, CNRS, Université d’Orléans, 18330 Nançay, France
TWEPP 2017
digitize near antenna: time-stamped packets NOT analog cables uses CERN White Rabbit timing system
stage 1 post reionization 0 < z < 2 stage 2 post reionization 2 < z < 6 stage 3 dark ages 30 < z < 150 context 2018-2020
data taking construction 1st results community building
LSST/DESI ongoing stage 1 first results decadal survey submission
2020-2025
stage 1 results continuation?
R&D based on stage 1 simulations firm up science case
LSST/DESI/Stage 1 P5 submission Decadal Survey results P5 results SKA online
2025-2030
collaboration forming CD0/CD1 LSST/DESI ending SKA results
2030-2035
construction start of data taking feasibility study preliminary design
? 2035-2040
data taking analysis construction start of data taking
? 2040-2045
data taking analysis
?
DOE21 “Cosmic Visions Dark Energy: 21-cm Roadmap” Slosar & co.