Cross-correlating Carbon Monoxide Line-intensity Maps with Spectroscopic and Photometric Galaxy Surveys

Dongwoo T. Chung, Marco P. Viero, Sarah E. Church, Risa H. Wechsler, Marcelo A. Alvarez, J. Richard Bond, Patrick C. Breysse, Kieran A. Cleary, Hans K. Eriksen, Marie K. Foss, Joshua O. Gundersen, Stuart E. Harper, Håvard T. Ihle, Laura C. Keating, Norman Murray, Hamsa Padmanabhan, George F. Stein, Ingunn K. Wehus

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


Line-intensity mapping is an emerging field of observational work, with strong potential to fit into a larger effort to probe large-scale structure and small-scale astrophysical phenomena using multiple complementary tracers. Taking full advantage of such complementarity means, in part, undertaking line-intensity surveys with galaxy surveys in mind. We consider the potential for detection of a cross-correlation signal between COMAP and blind surveys based on photometric redshifts (as in COSMOS) or based on spectroscopic data (as with the HETDEX survey of Lyα emitters). We find that obtaining accuracy in redshifts and 10 -4 sources per Mpc 3 with spectroscopic redshift determination should enable a CO-galaxy cross spectrum detection significance at least twice that of the CO auto spectrum. Either a future targeted spectroscopic survey or a blind survey like HETDEX may be able to meet both of these requirements.

Original languageEnglish (US)
Article number186
JournalAstrophysical Journal
Issue number2
StatePublished - 2019


  • cosmology: theory
  • galaxies: high-redshift
  • galaxies: statistics
  • radio lines: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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