A Foreground Masking Strategy for [C II] Intensity Mapping Experiments Using Galaxies Selected by Stellar Mass and Redshift

G. Sun*, L. Moncelsi, M. P. Viero, M. B. Silva, J. Bock, C. M. Bradford, T. -C. Chang, Y. -T. Cheng, A. R. Cooray, A. Crites, S. Hailey-Dunsheath, B. Uzgil, J. R. Hunacek, M. Zemcov

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Intensity mapping provides a unique means to probe the epoch of reionization (EoR), when the neutral intergalactic medium was ionized by energetic photons emitted from the first galaxies. The [C II] 158 mu m fine-structure line is typically one of the brightest emission lines of star-forming galaxies and thus a promising tracer of the global EoR star formation activity. However, [C II] intensity maps at 6 less than or similar to z less than or similar to 8 are contaminated by interloping CO rotational line emission (3 10(8) M-circle dot selected in the K-band from the COSMOS/UltraVISTA survey, which can be converted to CO line strengths. For a mock field of the Tomographic Ionizedcarbon Mapping Experiment, we find that masking out the "voxels" (spectral-spatial elements) containing foreground galaxies identified using an optimized CO flux threshold results in a z-dependent criterion m(K)(AB) less than or similar to 22 (or M-* greater than or similar to 10(9) M-circle dot) at z <1 and makes a [C II]/COtot power ratio of greater than or similar to 10 at k = 0.1 h/Mpc achievable, at the cost of a moderate less than or similar to 8% loss of total survey volume.

Original languageEnglish
Article number107
Number of pages15
JournalAstrophysical Journal
Volume856
Issue number2
DOIs
Publication statusPublished - 1-Apr-2018

Keywords

  • cosmology: observations
  • dark ages, reionization, first stars
  • diffuse radiation
  • intergalactic medium
  • large-scale structure of universe
  • STAR-FORMATION-RATE
  • ALMA SPECTROSCOPIC SURVEY
  • COSMOS FIELD
  • EAGLE SIMULATIONS
  • MOLECULAR GAS
  • LUMINOSITY FUNCTIONS
  • LEGACY SURVEY
  • MU-M
  • EVOLUTION
  • REIONIZATION

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