Predictions for the 21cm-galaxy cross-power spectrum observable with SKA and future galaxy surveys

Vrbanec, D., Ciardi, B., Jelic, V., Jensen, H., Iliev, I. T., Mellema, G. & Zaroubi, S., Mar-2020, In : Monthly Notices of the Royal Astronomical Society. 492, 4, p. 4952-4958 7 p.

Research output: Contribution to journalArticleAcademicpeer-review

  • Dijana Vrbanec
  • Benedetta Ciardi
  • Vibor Jelic
  • Hannes Jensen
  • Ilian T. Iliev
  • Garrelt Mellema
  • Saleem Zaroubi

In this paper, we use radiative transfer+N-body simulations to explore the feasibility of measurements of cross-correlations between the 21-cm field observed by the Square Kilometre Array (SKA) and high-z Lyman alpha emitters (LAEs) detected in galaxy surveys with the Subaru Hyper Suprime-Cam (HSC), Subaru Prime Focus Spectrograph (PFS), and Wide Field Infrared Survey Telescope (WFIRST). 2 lcm-LAE cross-correlations are in fact a powerful probe of the epoch of reionization as they are expected to provide precious information on the progress of reionization and the typical scale of ionized regions at different redshifts. The next generation observations with SKA will have a noise level much lower than those with its precursor radio facilities, introducing a significant improvement in the measurement of the cross-correlations. We find that an SKA-HSC/PFS observation will allow to investigate scales below 10 and similar to 60 h(-1) Mpc at z = 7.3 and 6.6, respectively. WHR,ST will allow to access also higher redshifts, as it is expected to observe spectroscopically similar to 900 LAEs per deg(2) and unit redshi in the range 7.5

Original languageEnglish
Pages (from-to)4952-4958
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Publication statusPublished - Mar-2020


  • galaxies: high-redshift, intergalactic medium, dark ages, reionization, first stars, cosmology: observations, SIMULATING COSMIC REIONIZATION, 21 CM FOREST, HIGH-REDSHIFT, INTERGALACTIC MEDIUM, LARGE SCALES, EPOCH, SIGNAL, LOFAR, TEMPERATURE, EMISSION

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