The kinetic Sunyaev-Zel'dovich effect from reionization: simulated full-sky maps at arcminute resolution
Journal Article
·
· Astrophysical Journal
- Canadian Institute for Theoretical Astrophysics, 60 St. George Street, Toronto, ON M5S 3H8 (Canada)
The kinetic Sunyaev–Zel’dovich (kSZ) effect results from Thomson scattering by coherent flows in the reionized intergalactic medium. We present new results based on ray-tracing an 8 Gpc/h realization of reionization with resolution elements 2 Mpc/h (subtending ∼1′ at z = 6) on a side to create a full-sky kSZ map. The realization includes, self-consistently, the effects of reionization on scales corresponding to multipoles 10≲ℓ≲5000. We separate the kSZ map into Doppler (v), Ostriker–Vishniac (δv), patchy (xv), and third-order (xδv) components, and compute explicitly all the auto- and cross-correlations (e.g., 〈vv〉, 〈δvxv〉, etc.) that contribute to the total power. We find a complex and nonmonotonic dependence on the duration of reionization at ℓ∼300 and evidence for a non-negligible (10%–30%) contribution from connected four-point correlations, 〈xvxv〉{sub c}, usually neglected in analytical models. We also investigate the cross-correlation of linear matter and large-scale kSZ temperature fluctuations, focusing on (1) cross-power spectra with biased tracers of the matter density and (2) cold spots from infall onto large, rare H ii regions centered on peaks in the matter distribution at redshifts z>10 that are a generic non-Gaussian feature of patchy reionization. Finally, we show that the reionization history can be reconstructed at 5σ–10σ significance by correlating full-sky 21 cm maps stacked in bins with Δν = 10 MHz with existing cosmic microwave background (CMB) temperature maps at ℓ<500, raising the prospects for probing reionization by correlating CMB and LSS measurements. The resulting kSZ maps have been made publicly available at www.cita.utoronto.ca/∼malvarez/research/ksz-data/.
- OSTI ID:
- 22868975
- Journal Information:
- Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 824; ISSN ASJOAB; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
Similar Records
REIONIZATION ON LARGE SCALES. II. DETECTING PATCHY REIONIZATION THROUGH CROSS-CORRELATION OF THE COSMIC MICROWAVE BACKGROUND
REIONIZATION ON LARGE SCALES. III. PREDICTIONS FOR LOW-l COSMIC MICROWAVE BACKGROUND POLARIZATION AND HIGH-l KINETIC SUNYAEV-ZEL'DOVICH OBSERVABLES
Journal Article
·
Sun Oct 20 00:00:00 EDT 2013
· Astrophysical Journal
·
OSTI ID:22270766
REIONIZATION ON LARGE SCALES. III. PREDICTIONS FOR LOW-l COSMIC MICROWAVE BACKGROUND POLARIZATION AND HIGH-l KINETIC SUNYAEV-ZEL'DOVICH OBSERVABLES
Journal Article
·
Sun Oct 20 00:00:00 EDT 2013
· Astrophysical Journal
·
OSTI ID:22270767