SIMBAD references

2011ApJ...738L...6L - Astrophys. J., 738, L6 (2011/September-1)

Discovery of water vapor in the high-redshift quasar APM 08279+5255 at z = 3.91.

LIS D.C., NEUFELD D.A., PHILLIPS T.G., GERIN M. and NERI R.

Abstract (from CDS):

We report a detection of the excited 220-211 rotational transition of para-H2 O in APM 08279+5255 using the IRAM Plateau de Bure Interferometer. At z = 3.91, this is the highest-redshift detection of interstellar water to date. From large velocity gradient modeling, we conclude that this transition is predominantly radiatively pumped and on its own does not provide a good estimate of the water abundance. However, additional water transitions are predicted to be detectable in this source, which would lead to an improved excitation model. We also present a sensitive upper limit for the hydrogen fluoride (HF) J = 1-0 absorption toward APM 08279+5255. While the face-on geometry of this source is not favorable for absorption studies, the lack of HF absorption is still puzzling and may be indicative of a lower fluorine abundance at z = 3.91 compared with the Galactic interstellar medium.

Abstract Copyright:

Journal keyword(s): cosmology: observations - galaxies: active - galaxies: high-redshift - galaxies: individual: APM 08279+5255 - ISM: molecules

Simbad objects: 7

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2019.10.21-08:31:58

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