2017A&A...599A.100G


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.25CET09:40:26

2017A&A...599A.100G - Astronomy and Astrophysics, volume 599A, 100-100 (2017/3-1)

Dissecting the molecular structure of the Orion B cloud: insight from principal component analysis.

GRATIER P., BRON E., GERIN M., PETY J., GUZMAN V.V., ORKISZ J., BARDEAU S., GOICOECHEA J.R., LE PETIT F., LISZT H., OBERG K., PERETTO N., ROUEFF E., SIEVERS A. and TREMBLIN P.

Abstract (from CDS):

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 50h. 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.

Abstract Copyright: © ESO, 2017

Journal keyword(s): ISM: molecules - ISM: clouds - photon-dominated region (PDR) - ISM: individual objects: Orion B - methods: statistical - methods: statistical

Simbad objects: 12

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Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME OMC1 Ridge reg 05 35 13.4 -05 23 07           ~ 123 0
2 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2025 1
3 NAME Ori A MoC 05 38 -07.1           ~ 2697 0
4 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 451 0
5 IC 434 HII 05 41 -02.5           ~ 77 1
6 NGC 2023 RNe 05 41 37.9 -02 15 52           ~ 574 1
7 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1181 0
8 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1077 1
9 IC 435 RNe 05 43 00.5 -02 18 45           ~ 43 0
10 NAME RCW 106 GMC MoC 16 21.0 -50 30           ~ 35 0
11 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3516 3
12 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1943 1

    Equat.    Gal    SGal    Ecl

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2020.10.25-09:40:26

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