SIMBAD references

2011ApJ...742L..21M - Astrophys. J., 742, L21 (2011/December-1)

Discovery of hydrogen fluoride in the cloverleaf quasar at z = 2.56.

MONJE R.R., PHILLIPS T.G., PENG R., LIS D.C., NEUFELD D.A. and EMPRECHTINGER M.

Abstract (from CDS):

We report the first detection of hydrogen fluoride (HF) toward a high-redshift quasar. Using the Caltech Submillimeter Observatory, we detect the HF J = 1-0 transition in absorption toward the Cloverleaf, a broad absorption line quasi-stellar object at z = 2.56. The detection is statistically significant at the ∼6σ level. We estimate a lower limit of 4x1014/cm2 for the HF column density and using a previous estimate of the hydrogen column density, we obtain a lower limit of 1.7x10–9 for the HF abundance. This value suggests that, assuming a Galactic N(HF)/NHratio, HF accounts for at least ∼10% of the fluorine in the gas phase along the line of sight to the Cloverleaf quasar. This observation corroborates the prediction that HF should be a good probe of the molecular gas at high redshift. Measurements of the HF abundance as a function of redshift are urgently needed to better constrain the fluorine nucleosynthesis mechanism(s).

Abstract Copyright:

Journal keyword(s): astrochemistry - cosmology: observations - ISM: individual: Cloverleaf - ISM: molecules

Simbad objects: 11

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2020.01.26-13:05:09

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