Possible detection of a CO emission line from a quasar at z = 2.88

Toru Yamada, Kentaro Aoki, Akihiko Tomita, Tadafumi Takata, Kouji Ohta, Michitoshi Yoshida

Research output: Contribution to journalArticlepeer-review


We observed a high-redshift luminous radio-quiet quasar Q1235+0857 at z = 2.880 with the Nobeyama 45 m radio telescope aiming at detection of a redshifted 12CO (J = 3-2) emission line. We have marginally (3-5 σ significance) detected an emission-line-like feature at ∼89.8 GHz (z = 2.883) with ∼150 km s-1 width (FWHM). Adopting the standard CO to H2 conversion factor obtained for galactic giant molecular clouds, the CO luminosity can be roughly converted to H2 gas mass of ∼1012 M, which is much larger than the molecular gas content of any galaxies at preent epoch and nearly equal to the total stellar mass of a giant elliptical galaxy. Although we should note that a confirmation of the detection by an independent facility is absolutely needed, the results discussed in this Letter would support the idea that luminous quasars at high redshift are associated with the massive galaxies in their forming phase.

Original languageEnglish
Pages (from-to)L5-L7
JournalAstrophysical Journal
Issue number1 PART 2
Publication statusPublished - 1995 Jan 1
Externally publishedYes


  • Galaxies: formation
  • Galaxies: starburst
  • Quasars: emission lines

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


Dive into the research topics of 'Possible detection of a CO emission line from a quasar at z = 2.88'. Together they form a unique fingerprint.

Cite this