CO observations of a FeLoBAL Quasar with an Ha absorption line at z=2.3

Kouji Ohta, Gaku Kiuchi, Kouichiro Nakanishi, Kentaro Aoki, Ikuru Iwata, Masayuki Akiyama, Naoyuki Tamura, Masataka Ando

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1 Citation (Scopus)


SDSS J083942.11+380526.3 is an Iron Low-ionization Broad Absorption Line (FeLoBAL) quasar at z = 2.3, and Aoki et al. (2006) recently found the presence of an Hα absorption line in the broad Hα emission line. Motivated by an idea that this quasar may be a huge molecular gas reservoir in the early phase of quasar evolution, we made CO(J = 3-2) observations of it using the Nobeyama Millimeter Array. No significant CO emission was detected; although an emission-like feature (2.5σ) was seen close (∼ 2″) to the quasar, we regard it as noise. The obtained 3σ upper limit on the CO luminosity is LCO(J=3-2)′ = 4.5 × 1010 K km s-1 pc2, which corresponds to M(H2) = 3.6 × 1010M if we adopt CO-to-H2 conversion factor of 0.8 M (K km s_1 pc 2)-1. This upper limit is comparable to L CO(J=3-2)′ (and thus the molecular gas mass) detected in quasars and BAL quasars at z= 1-3, and no sign of the presence of the huge amount of molecular gas in this FeLoBAL quasar was obtained.

Original languageEnglish
Pages (from-to)527-530
Number of pages4
JournalPublications of the Astronomical Society of Japan
Issue number3
Publication statusPublished - 2007
Externally publishedYes


  • Galaxies: active
  • Galaxies: quasars: emission lines

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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