WATER VAPOR EMISSION REVEALS A HIGHLY OBSCURED , STAR-FORMING NUCLEAR REGION IN THE QSO HOST GALAXY APM 08279 + 5255 AT z = 3 . 9

@inproceedings{Werf2011WATERVE,
  title={WATER VAPOR EMISSION REVEALS A HIGHLY OBSCURED , STAR-FORMING NUCLEAR REGION IN THE QSO HOST GALAXY APM 08279 + 5255 AT z = 3 . 9},
  author={Paul P. van der Werf and A. Berciano Alba and Marco Spaans and A. F. Loenen and Rowin Meijerink and Dominik Alexander Riechers and Pierre Cox and Anyang Wei and Fabian Walter},
  year={2011}
}
We present the detection of four rotational emission lines of water vapor, from energy levels Eu/k = 101–454 K, in the gravitationally lensed z = 3.9 QSO host galaxy APM 08279+5255. While the lowest H2O lines are collisionally excited in clumps of warm, dense gas (density of hydrogen nuclei nH = (3.1 ± 1.2) × 106 cm−3, gas temperature Tg ∼ 105 ± 21 K), we… CONTINUE READING