Dissecting the molecular structure of the Orion B cloud: insight from principal component analysis
PETY, Jérôme
Institut de RadioAstronomie Millimétrique [IRAM]
Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]
Institut de RadioAstronomie Millimétrique [IRAM]
Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]
ORKISZ, Jan
Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]
Université Grenoble Alpes [2016-2019] [UGA [2016-2019]]
Institut de RadioAstronomie Millimétrique [IRAM]
Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]
Université Grenoble Alpes [2016-2019] [UGA [2016-2019]]
Institut de RadioAstronomie Millimétrique [IRAM]
GOICOECHEA, Javier
Consejo Superior de Investigaciones Cientificas [España] = Spanish National Research Council [Spain] [CSIC]
Consejo Superior de Investigaciones Cientificas [España] = Spanish National Research Council [Spain] [CSIC]
PERETTO, Nicolas
School of Physics and Astronomy [Cardiff]
Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)]
School of Physics and Astronomy [Cardiff]
Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)]
TREMBLIN, Pascal
Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)]
University of Exeter
Maison de la Simulation [MDLS]
< Reduce
Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)]
University of Exeter
Maison de la Simulation [MDLS]
Language
en
Article de revue
This item was published in
Astronomy and Astrophysics - A&A. 2017, vol. 599, p. A100
EDP Sciences
English Abstract
Context. The combination of wideband receivers and spectrometers currently available in (sub-)millimeter observatories deliver wide-field hyperspectral imaging of the interstellar medium. Tens of spectral lines can be ...Read more >
Context. The combination of wideband receivers and spectrometers currently available in (sub-)millimeter observatories deliver wide-field hyperspectral imaging of the interstellar medium. Tens of spectral lines can be observed over degree wide fields in about 50 h. This wealth of data calls for restating the physical questions about the interstellar medium in statistical terms.Aims. We aim to gain information on the physical structure of the interstellar medium from a statistical analysis of many lines from different species over a large field of view, without requiring detailed radiative transfer or astrochemical modeling.Methods. We coupled a non-linear rescaling of the data with one of the simplest multivariate analysis methods, namely the principal component analysis, to decompose the observed signal into components that we interpret first qualitatively and then quantitatively based on our deep knowledge of the observed region and of the astrochemistry at play.Results. We identify three principal components, linear compositions of line brightness temperatures, that are correlated at various levels with the column density, the volume density and the UV radiation field.Conclusions. When sampling a sufficiently diverse mixture of physical parameters, it is possible to decompose the molecular emission in order to gain physical insight on the observed interstellar medium. This opens a new avenue for future studies of the interstellar medium.Read less <
English Keywords
Astrophysics - Astrophysics of Galaxies
ISM: molecules
ISM: clouds
photon-dominated region (PDR)
ISM: individual objects: Orion B
methods: statistical
Origin
Hal imported