Details

Autor(en) / Beteiligte

• Li, Dongzi
• Zhu, Hong-Ming
• Pen, Ue-Li

Titel

Cross-correlation of the kinematic Sunyaev-Zel’dovich effect and 21 cm intensity mapping with tidal reconstruction

Ist Teil von

• Physical review. D, 2019-07, Vol.100 (2), p.023517, Article 023517

Ort / Verlag

College Park: American Physical Society

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We discuss the possibility of studying diffuse baryon distributions with the kinematic Sunyaev-Zel'dovich (kSZ) effect by correlating cosmic microwave background (CMB) temperature fluctuations with density fluctuations from 21 cm intensity mapping (IM). The biggest challenge for the cross-correlation is the loss of large-scale information in IM, due to foregrounds and the zero spacing problem of interferometers. We apply the 3D tidal reconstruction algorithm to restore the lost large-scale modes, which increases the correlation by more than a factor of 3. With the predicted foreground level, we expect a ~20σ detection of kSZ signal for 0.8≲z≲2.5 with CHIME and Planck, and a ~40σ detection with HIRAX and Planck. The significance can be greatly increased with next-generation facilities of higher spatial resolutions.