Distance measurement of galaxies to a redshift of ∼0.1 using the CO-line Tully-Fisher relation

Yoshiaki Sofue, Franz Schöniger, Mareki Honma, Yoshinori Tutui, Takashi Ichikawa, Ken Ichi Wakamatsu, Ilya Kazes, John Dickey

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


We report on the first results of a long-term project to derive the distances of galaxies at cosmological distances by applying the CO-line width-luminosity relation. We have obtained deep CO-line observations of galaxies at redshifts of up to cz ∼ 29000 km s-1 using the Nobeyama 45-m mm-wave telescope; also, some supplementary data were obtained using the IRAM 30-m telescope. We have detected CO-line emission from several galaxies, and used their CO-line widths to estimate the absolute luminosities based on the line-width-luminosity relation. In order to obtain photometric data and an inclination correction, we also performed optical imaging observations of the CO-detected galaxies using the CFHT 3.6-m telescope at high resolution. The radio and optical data have been combined to derive the distance moduli and distances of the galaxies; also, the Hubble ratios were estimated for these galaxies. We propose that the CO-line width-luminosity relation can be a powerful method to derive the distances of galaxies to redfhifts of z ∼ 0.1, and to derive the Hubble ratio within a significant volume of the universe.

Original languageEnglish
Pages (from-to)657-670
Number of pages14
JournalPublications of the Astronomical Society of Japan
Issue number5
Publication statusPublished - 1996
Externally publishedYes


  • Cosmology
  • Galaxies: Distances
  • Galaxies: General
  • Galaxies: Radio lines
  • Radio lines: CO molecular

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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