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A Search for the CO (J = 1–0) Emission Line toward the Quasar H1413+117

1999; Oxford University Press; Volume: 51; Issue: 4 Linguagem: Inglês

10.1093/pasj/51.4.479

2053-051X

Masato Tsuboi, Atsushi Miyazaki, Satoshi Imaizumi, Naomasa Nakai,

Astrophysical Phenomena and Observations

We have searched for the CO (J = 1-0) line emission toward the gravitational lensed “Cloverleaf„ quasar, H1413+117, at z – 2.56 using the 45-m telescope of Nobeyama Radio Observatory. The r.m.s. noise of the resultant spectrum was 1 < 7rms = 0.6 mK in TUB or 1.6 mJy for a velocity resolution of 50 km s−1. We obtained the 5 αims upper limit of the velocity-integrated CO (J = 1–0) line flux, / S^dv < 1.4 Jy km s- The lower limit of the intrinsic ratio of the brightness temperature is TB[ CO (J = 3-2)]/TB[ CO (J = 1-0)] > 0.79 at z = 2.56. This value corresponds to TB[CO(J = 3-2)]/TB[CO (J - 1-0)] >= 0.72–0.75 at z = 0 from a LVG calculation. This temperature ratio is consistent with those in the central regions of nearby IR luminous galaxies.