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Paper: Molecular Emission at High Redshift: Observations of BR1202-0725
Volume: 156, Highly Redshifted Radio Lines
Page: 45
Authors: Kawabe, R.; Kohno, K.; Ohta, K.; Carilli, C.
Abstract: We present recent results for CO(2-1) and 8 GHz continuum observations of one of the most distant quasars known BR1202-0725 (z = 4.7) with the VLA and the NRO 45m telescope. The obtained CO(2-1) intensity was used to estimate the molecular gas properties and mass together with CO(5-4), CO(4-3), and CO(7-6) successfully detected with the Nobeyama Millimeter Array and the IRAM interferometer. It is found that the molecular gas properties in BR1202-0725 are very similar to those in the prototypical starburst galaxy M82; the gas density is n(H_2) 10^{4-5} cm^{-3}; the temperature is as high as 50-100 K, and M(H_2) was estimated to be 1011 M_odot from the comparison of CO(5-4) luminosity with that in M82 (L_{CO(5-4)} is about 1000 times larger than L_{CO(5-4)} in M82). The 8.4 GHz continuum emission (rest frequency = 48 GHz) was marginally detected. The luminosity (L_nu) ratios to M82, R_{BR/M82}(nurest = 48 GHz), R_{BR/M82}(lambdarest = 100 microns) were also in the range of 500 - 1000. It is suggested that an intense initial starburst occurs in BR1202-0725 with SFR of 10^3 M_odot yr^{-1}, and in this sense BR1202-0725 would be a forming elliptical galaxy.
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