Hydrogen Fluoride in High-mass Star-forming Regions

@article{Emprechtinger2012HydrogenFI,
  title={Hydrogen Fluoride in High-mass Star-forming Regions},
  author={Martin Emprechtinger and Raquel Rodriguez Monje and Floris van der Tak and Matthijs van der Wiel and Dariusz C. Lis and David A. Neufeld and Thomas G. Phillips and Cecilia Ceccarelli},
  journal={The Astrophysical Journal},
  year={2012},
  volume={756},
  pages={136}
}
Hydrogen fluoride (HF) has been established to be an excellent tracer of molecular hydrogen in diffuse clouds. In denser environments, however, the HF abundance has been shown to be approximately two orders of magnitude lower. We present Herschel/HIFI observations of HF J = 1-0 toward two high-mass star formation sites, NGC 6334 I and AFGL 2591. In NGC 6334 I the HF line is seen in absorption in foreground clouds and the source itself, while in AFGL 2591 HF is partially in emission. We find an… 

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References

SHOWING 1-10 OF 10 REFERENCES
Structure and Evolution of the Envelopes of Deeply Embedded Massive Young Stars
The physical structure of the envelopes around a sample of 14 massive young stars is investigated using maps and spectra in submillimeter continuum and lines of C^(17)O, CS, C^(34)S, and H_2CO. Nine
The Chemistry of Fluorine-bearing Molecules in Diffuse and Dense Interstellar Gas Clouds
We present a theoretical investigation of the chemistry of fluorine-bearing molecules in diffuse and dense interstellar gas clouds, combining recent estimates for the rates of relevant chemical
Ultraviolet Survey of CO and H2 in Diffuse Molecular Clouds: The Reflection of Two Photochemistry Regimes in Abundance Relationships
We carried out a comprehensive far-UV survey of 12CO and H2 column densities along diffuse molecular Galactic sight lines. This sample includes new measurements of CO from HST spectra along 62 sight
The Impact of the Massive Young Star GL 2591 on Its Circumstellar Material: Temperature, Density, and Velocity Structure
The temperature, density, and kinematics of the gas and dust surrounding the luminous (2 × 10^4 L_☉) young stellar object GL 2591 are investigated on scales as small as ~100 AU, probed by 4.7 μm
Molecular gas and dust influenced by massive protostars: spectral surveys in the far-infrared and submillimeter
The interstellar gas from which new stars form is crucially influenced by these same protostars: gas particles are excited and heated by the protostar. At the same time, the star formation process
Millimeter Multiplicity in NGC 6334 I and I(N)
Using the Submillimeter Array (SMA), we have imaged the 1.3 mm continuum emission at the centers of the massive star-forming regions NGC 6334 I and I(N). In both regions, the SMA observations
Astronomical Society of the Pacific Conference Series
Proceedings of a workshop held atCrimean Astrophysical Observatory, Crimea, Ukraine14 -16 June 2004Edited byC. Martin Gaskell« Department of Physics & Astronomy, University of NebraskaLincoln,
Molecular Universe (Cambridge
  • A&A,
  • 2002