A photon dominated region code comparison study
- M. Röllig, N. Abel, M. Wolfire
- Physics
- 1 May 2007
Aims. We present a comparison between independent computer codes, modeling the physics and chemistry of interstellar photon dominated regions (PDRs). Our goal was to understand the mutual differences…
In-orbit performance of Herschel-HIFI
- P. Roelfsema, F. Helmich, U. Yıldız
- Physics
- 2012
Aims. In this paper the calibration and in-orbit performance of the Heterodyne Instrument for the Far-Infrared (HIFI) is described. Methods. The calibration of HIFI is based on a combination of…
Understanding star formation in molecular clouds - I. Effects of line-of-sight contamination on the column density structure
- N. Schneider, V. Ossenkopf, P. Andre'
- Physics, Environmental Science
- 12 March 2014
Column-density maps of molecular clouds are one of the most important observables in the context of molecular cloud- and star-formation (SF) studies. With the Herschel satellite it is now possible to…
Quantification of molecular cloud structure using the Delta -variance
- F. Bensch, J. Stutzki, V. Ossenkopf
- Environmental Science, Physics
- 1 February 2001
We present a detailed study of the Δ -variance as a method to quantify molecular cloud structure. The Δ -variance was introduced by Stutzki et al. (1998) to analyze the drift behaviour of scalar…
HERSCHEL SURVEY OF GALACTIC OH+, H2O+, AND H3O+: PROBING THE MOLECULAR HYDROGEN FRACTION AND COSMIC-RAY IONIZATION RATE
- N. Indriolo, D. Neufeld, F. Wyrowski
- Physics
- 2 December 2014
In diffuse interstellar clouds the chemistry that leads to the formation of the oxygen-bearing ions OH+, H2O+, and H3O+ begins with the ionization of atomic hydrogen by cosmic rays, and continues…
Understanding star formation in molecular clouds: II. Signatures of gravitational collapse of IRDCs
- N. Schneider, T. Csengeri, Australia.
- Physics, Environmental Science
- 12 June 2014
We analyse column density and temperature maps derived from Herschel dust continuum observations of a sample of prominent, massive infrared dark clouds (IRDCs) i.e. G11.11-0.12, G18.82-0.28,…
Detection of two power-law tails in the probability distribution functions of massive GMCs
- N. Schneider, S. Bontemps, U. Exeter
- Physics
- 31 July 2015
We report the novel detection of complex high-column density tails in the probability distribution functions (PDFs) for three high-mass star-forming regions (CepOB3, MonR2, NGC6334), obtained from…
VELOCITY-RESOLVED [C ii] EMISSION AND [C ii]/FIR MAPPING ALONG ORION WITH HERSCHEL
- J. Goicoechea, D. Teyssier, J. Stutzki
- PhysicsAstrophysical Journal
- 16 August 2015
It is concluded that the [C ii] emitting column relative to the total dust column along each line of sight is responsible for the observed L[C ii?]/LFIR variations through the cloud.
Herschel/HIFI observations of [C II] and [13C II] in photon-dominated regions
- V. Ossenkopf, M. Röllig, E. Bergin
- Physics
- 1 February 2013
Context. Chemical fractionation reactions in the interstellar medium can result in molecular isotopologue abundance ratios that differ by many orders of magnitude from the isotopic abundance ratios.…
The Herschel view of the massive star-forming region NGC 6334
- D. Russeil, N. Schneider, G. White
- Physics
- 1 June 2013
Aims: Fundamental to any theory of high-mass star formation are gravity and turbulence. Their relative importance, which probably changes during cloud evolution, is not known. By investigating the…
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