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Incorporating Astrochemistry into Molecular Line Modelling via Emulation

Status Report From: arXiv.org e-Print archive
Posted: Thursday, July 18, 2019

Damien de Mijolla, Serena Viti, Jonathan Holdship, Ioanna Manolopoulou, Jeremy Yates

(Submitted on 17 Jul 2019)

In studies of the interstellar medium in galaxies, radiative transfer models of molecular emission are useful for relating molecular line observations back to the physical conditions of the gas they trace. However, doing this requires solving a highly degenerate inverse problem. In order to alleviate these degeneracies, the abundances derived from astrochemical models can be converted into column densities and fed into radiative transfer models. This enforces that the molecular gas composition used by the radiative transfer models be chemically realistic. However, because of the complexity and long running time of astrochemical models, it can be difficult to incorporate chemical models into the radiative transfer framework. In this paper, we introduce a statistical emulator of the UCLCHEM astrochemical model, built using neural networks. We then illustrate, through examples of parameter estimations, how such an emulator can be applied on real and synthetic observations.

Comments: Accepted by A&A; Emulator soon to be publicly released

Subjects: Astrophysics of Galaxies (astro-ph.GA)

Cite as: arXiv:1907.07472 [astro-ph.GA] (or arXiv:1907.07472v1 [astro-ph.GA] for this version)

Submission history

From: Damien De Mijolla 

[v1] Wed, 17 Jul 2019 12:29:53 UTC (464 KB)

https://arxiv.org/abs/1907.07472

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