Synthetic observations of carbon lines of turbulent flows in the diffuse multiphase interstellar medium

M. Yamada, H. Koyama, K. Omukai, S. Inutsuka

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

We examine observational characteristics of multiphase turbulent flows in the diffuse interstellar medium (ISM) using a synthetic radiation field of atomic and molecular lines. We consider the multiphase ISM, which is formed by thermal instability under the irradiation of UV photons with moderate visual extinction AV ∼ 1. Radiation field maps of C+, C 0, and CO line emissions were generated by calculating the non-local thermodynamic equilibrium (non-LTE) level populations from the results of high-resolution hydrodynamic simulations of diffuse ISM models. By analyzing the synthetic radiation field of carbon lines of [C II] 158 μm, [C I] 3P2-3P1 (809 GHz), 3P1-3P0 (492 GHz), and CO rotational transitions, we found a high ratio between the lines of high- and low-excitation energies in the diffuse multiphase ISM. This shows that simultaneous observations of the lines of warm- and cold-gas tracers will be useful in examining the thermal structure, and hence the origin, of diffuse interstellar clouds.

Original languageEnglish
Pages (from-to)849-859
Number of pages11
JournalAstrophysical Journal
Volume657
Issue number2 I
DOIs
Publication statusPublished - 2007 Mar 10
Externally publishedYes

Keywords

  • ISM: clouds
  • ISM: molecules
  • Radio lines: ISM

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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