CO Observations of a FeLoBAL Quasar with an Hα $\alpha$ Absorption Line at z = 2.3: Fig. 1

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 presenceof an H alpha absorption line in the broad H alpha emission line. Motivated byan idea that this quasar may be a huge molecular gas reservoir in the earlyphase of quasar evolution, we made CO(J=3-2) observations of it using theNobeyama Millimeter Array. No significant CO emission was detected; although anemission-like feature (2.5 sigma) was seen close (~ 2") to the quasar, weregard it as a noise. The obtained 3 sigma upper limit on the CO luminosity isL'_{{\rm CO}(J=3-2)} = 4.5 \times 10^{10} K km/s pc^2, which corresponds toM({\rm H}_2) = 3.6 times 10^10 M_{\odot} if we adopt the CO-to-H_2 conversionfactor of 0.8 M_{\odot} (K km/s pc^2)^{-1}. This upper limit is comparable toL'_{{\rm CO}(J=3-2)} (and thus the molecular gas mass) detected in quasars andBAL quasars at z=1-3, and no sign of the presence of the huge amount ofmolecular gas in this FeLoBAL quasar was obtained.Comment: 7 pages, 1 figure. Accepted by PAS