2007PASJ...59..527O

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 (2.5s) was seen close (∼ 2'') to the quasar, we regard it as noise. The obtained 3s upper limit on the CO luminosity is L'_CO(J=3–2) = 4.5 x 10¹⁰ K km/s pc², which corresponds to M(H₂) = 3.6 x 10¹⁰ M_☉ if we adopt CO-to-H² conversion factor of 0.8 M_☉ (K km/s pc²)^–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.