Discovery of Interstellar Hydrogen Fluoride

  title={Discovery of Interstellar Hydrogen Fluoride},
  author={David A. Neufeld and Jonas Zmuidzinas and Peter Schilke and Thomas G. Phillips},
  journal={The Astrophysical Journal Letters},
  pages={L141 - L144}
We report the first detection of interstellar hydrogen fluoride. Using the Long Wavelength Spectrometer of the Infrared Space Observatory (ISO), we have detected the 121.6973 μm J=2-1 line of HF in absorption toward the far-infrared continuum source Sagittarius B2. The detection is statistically significant at the 13 σ level. On the basis of our model for the excitation of HF in Sgr B2, the observed line equivalent width of 1.0 nm implies a hydrogen fluoride abundance of ~3 × 10-10 relative to… 

Herschel observations of EXtra-Ordinary Sources (HEXOS): Detection of hydrogen fluoride in absorption towards Orion KL

We report a detection of the fundamental rotational transition of hydrogen fluoride in absorption towards Orion KL using Herschel/HIFI. After the removal of contaminating features associated with

HIFI detection of hydrogen fluoride in the carbon star envelope IRC +10216

We report the detection of emission in the J = 1−0 rotational transition of hydrogen fluoride (HF), together with observations of the J = 1−0 to J = 3−2 rotational lines of H35Cl and H37Cl, towards

Strong absorption by interstellar hydrogen fluoride: Herschel/HIFI observations of the sight-line to G10.6-0.4 (W31C)

We report the detection of strong absorption by interstellar hydrogen fluoride along the sight-line to the submillimeter continuum source G10.6-0.4 (W31C). We have used Herschel's HIFI instrument, in

First detection of 13CH in the interstellar medium

In recent years, a plethora of observations with high spectral resolution of sub-millimetre and far-infrared transitions of methylidene (CH), conducted with Herschel and SOFIA, have demonstrated this


Herschel/HIFI observations have revealed the presence of widespread absorption by hydrogen fluoride (HF) J = 1–0 rotational transition, toward a number of Galactic sources. We present observations of

Origin of hydrogen fluoride emission in the Orion Bar

Context. The hydrogen fluoride (HF) molecule is seen in absorption in the interstellar medium (ISM) along many lines of sight. Surprisingly, it is observed in emission toward the Orion Bar, which is


We report the first detection of the v = 1–0, R(0) ro-vibrational transition of HF at 2.499385 μm arising from interstellar gas. The line is seen in absorption toward three background sources—HD

Far Ultraviolet Spectroscopic Explorer Measurements of Interstellar Fluorine

The source of fluorine is not well understood, although core-collapse supernovae, Wolf-Rayet stars, and asymptotic giant branch stars have been suggested. A search for evidence of the ν-process

Discovery of interstellar CF

We discuss the first astronomical detection of the CF + (fluoromethylidynium) ion, obtained by observations of the J = 1− 0 (102.6 GHz), J = 2− 1 (205.2 GHz) and J = 3− 2 (307.7 GHz) rotational

Herschel/HIFI Discovery of HCL^+ in the Interstellar Medium

The radical ion HCl+, a key intermediate in the chlorine chemistry of the interstellar gas, has been identified for the first time in the interstellar medium with the Herschel Space Observatory's



Chlorine in dense interstellar clouds : the abundance of HCl in OMC-1.

We report the first detection of a chlorine-bearing molecular species in the interstellar medium via emission from the J = 1 → 0 transition of HCl at 625.9 GHz toward OMC-1. The relative strengths,

HCl Absorption toward Sagittarius B2

Comparison of this result to chemical models indicates that the depletion factor of gas-phase chlorine is between 50-180 in the molecular envelope surrounding the SgrB2(N) and (M) dust cores.

Excitation of interstellar hydrogen chloride

We have computed new rate coefficients for the collisional excitation of HCl by He, in the close-coupled formalism and using an interaction potential determined recently by Willey, Choong, & DeLucia.

Exotic fluoride molecules in IRC +10216: Confirmation of AlF and searches for MgF and CaF

Three new rotational transitions of aluminum fluoride (AlF) at 0.8 and 1.2 mm have been observed. The J = 10-9, J = 8-7, and J = 7-6 lines of AlF at 230, 263, and 329 GHz, respectively, were seen

nu-2 band of H2 O-16 - Line strengths and transition frequencies

High-resolution spectra of H216O were recorded with a Fourier-transform spectrometer covering transitions in the (010)–(000) band from 1066 to 2582 cm−1. The measured line frequencies were used along

Polarizability Anisotropy of Hydrogen Fluoride

The hyperfine spectra for the J=1 and 2 states of hydrogen fluoride have been observed by molecular beam electric resonance spectroscopy. The observed Stark coefficients are corrected for centrifugal

The temperature dependence of absolute rate constants for the F+H2 and F+D2 reactions

Multiphoton dissociation of SF6 has been used to generate a transient concentration of fluorine atoms in mixtures with argon and H2 or D2. Absolute rate constants for the F+H2 and F+D2 reactions have

Absolute rate coefficients for F+H2 and F+D2 at T=295–765 K.

The rate coefficients of the F+H2 and F+D2 reactions must be accurately known over a wide temperature range if the HF and DF chemical lasers are to be properly modeled. Although the pulsed and cw