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C18O, 13CO, and 12C...
C18O, 13CO, and 12CO abundances and excitation temperatures in the Orion B molecular cloud: Analysis of the achievable precision in modeling spectral lines within the approximation of the local thermodynamic equilibrium
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- Roueff, Antoine (författare)
- Institut Fresnel
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- Gerin, M. (författare)
- Observatoire de Paris,Paris Observatory
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- Gratier, P. (författare)
- Université de Bordeaux,University of Bordeaux
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- Levrier, F. (författare)
- Ecole Normale Superieure (ENS)
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- Pety, J. (författare)
- Institut de Radioastronomie Millimétrique (IRAM),Observatoire de Paris,Paris Observatory
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- Gaudel, Mathilde (författare)
- Observatoire de Paris,Paris Observatory
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- Goicoechea, J.R. (författare)
- CSIC - Instituto de Fisica Fundamental (IFF)
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- Orkisz, Jan, 1991 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- De Souza Magalhaes, Victor (författare)
- Institut de Radioastronomie Millimétrique (IRAM)
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- Vono, Maxime (författare)
- Université de Toulouse,University of Toulouse
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- Bardeau, Sébastien (författare)
- Institut de Radioastronomie Millimétrique (IRAM)
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- Bron, E. (författare)
- Observatoire de Paris,Paris Observatory
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- Chanussot, Jocelyn (författare)
- Université Grenoble Alpes,Grenoble Alpes University
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- Chainais, Pierre (författare)
- Université de Lille,University of Lille
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- Guzman, Viviana (författare)
- Pontificia Universidad Catolica de Chile
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- Hughes, Annie (författare)
- Universite Paul Sabatier Toulouse III,Paul Sabatier University
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- Kainulainen, Jouni, 1979 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Languignon, David (författare)
- Observatoire de Paris,Paris Observatory
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- Le Bourlot, Jacques (författare)
- Observatoire de Paris,Paris Observatory
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- Le Petit, Franck, 1975 (författare)
- Observatoire de Paris,Paris Observatory
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- Liszt, Harvey (författare)
- National Radio Astronomy Observatory
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- Marchal, Antoine (författare)
- Institut canadien d'astrophysique théorique,Canadian Institute for Theoretical Astrophysics
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- Miville-Deschênes, Marc Antoine (författare)
- Université Paris-Saclay,University Paris-Saclay
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- Peretto, Nicolas (författare)
- Cardiff University
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- Roueff, Evelyne (författare)
- Observatoire de Paris,Paris Observatory
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- Sievers, Albrecht (författare)
- Institut de Radioastronomie Millimétrique (IRAM)
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(creator_code:org_t)
- 2020-12-23
- 2021
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 645
- Relaterad länk:
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https://research.cha... (primary) (free)
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https://doi.org/10.1...
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https://research.cha...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Context. CO isotopologue transitions are routinely observed in molecular clouds for the purpose of probing the column density of the gas and the elemental ratios of carbon and oxygen, in addition to tracing the kinematics of the environment. Aims. Our study is aimed at estimating the abundances, excitation temperatures, velocity field, and velocity dispersions of the three main CO isotopologues towards a subset of the Orion B molecular cloud, which includes IC 434, NGC 2023, and the Horsehead pillar. Methods. We used the Cramer Rao bound (CRB) technique to analyze and estimate the precision of the physical parameters in the framework of local-thermodynamic-equilibrium (LTE) excitation and radiative transfer with added white Gaussian noise. We propose a maximum likelihood estimator to infer the physical conditions from the 1-0 and 2-1 transitions of CO isotopologues. Simulations show that this estimator is unbiased and proves efficient for a common range of excitation temperatures and column densities (Tex > 6 K, N > 1014-1015 cm-2). Results. Contrary to general assumptions, the various CO isotopologues have distinct excitation temperatures and the line intensity ratios between different isotopologues do not accurately reflect the column density ratios. We find mean fractional abundances that are consistent with previous determinations towards other molecular clouds. However, significant local deviations are inferred, not only in regions exposed to the UV radiation field, but also in shielded regions. These deviations result from the competition between selective photodissociation, chemical fractionation, and depletion on grain surfaces. We observe that the velocity dispersion of the C18O emission is 10% smaller than that of 13CO. The substantial gain resulting from the simultaneous analysis of two different rotational transitions of the same species is rigorously quantified. Conclusions. The CRB technique is a promising avenue for analyzing the estimation of physical parameters from the fit of spectral lines. Future works will generalize its application to non-LTE excitation and radiative transfer methods.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- NATURVETENSKAP -- Matematik -- Sannolikhetsteori och statistik (hsv//swe)
- NATURAL SCIENCES -- Mathematics -- Probability Theory and Statistics (hsv//eng)
Nyckelord
- Methods: data analysis
- Radiative transfer
- ISM: clouds
- ISM: molecules
- Methods: statistical
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Roueff, Antoine
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Gerin, M.
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Gratier, P.
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Levrier, F.
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Pety, J.
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Gaudel, Mathilde
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visa fler...
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Goicoechea, J.R.
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Orkisz, Jan, 199 ...
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De Souza Magalha ...
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Vono, Maxime
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Bardeau, Sébasti ...
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Bron, E.
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Chanussot, Jocel ...
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Chainais, Pierre
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Guzman, Viviana
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Hughes, Annie
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Kainulainen, Jou ...
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Languignon, Davi ...
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Le Bourlot, Jacq ...
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Le Petit, Franck ...
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Liszt, Harvey
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Marchal, Antoine
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Miville-Deschêne ...
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Peretto, Nicolas
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Roueff, Evelyne
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Sievers, Albrech ...
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