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  On the three-dimensional structure of local molecular clouds

Zucker, C., Goodman, A., Alves, J., Bialy, S., Koch, E. W., Speagle, J. S., et al. (2021). On the three-dimensional structure of local molecular clouds. The Astrophysical Journal, 919(1): 35. doi:10.3847/1538-4357/ac1f96.

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Zucker, Catherine, Author
Goodman, Alyssa, Author
Alves, João, Author
Bialy, Shmuel, Author
Koch, Eric W., Author
Speagle, Joshua S., Author
Foley, Michael M., Author
Finkbeiner, Douglas, Author
Leike, Reimar1, Author              
Enßlin, Torsten2, Author              
Peek, Joshua E. G., Author
Edenhofer, Gordian2, Author              
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1Physical Cosmology, MPI for Astrophysics, Max Planck Society, ou_2205644              
2Computational Structure Formation, MPI for Astrophysics, Max Planck Society, ou_2205642              

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 Abstract: We leverage the 1 pc spatial resolution of the Leike et al. three-dimensional (3D) dust map to characterize the 3D structure of nearby molecular clouds (d ≲ 400 pc). We start by "skeletonizing" the clouds in 3D volume density space to determine their "spines," which we project on the sky to constrain cloud distances with ≈1% uncertainty. For each cloud, we determine an average radial volume density profile around its 3D spine and fit the profiles using Gaussian and Plummer functions. The radial volume density profiles are well described by a two-component Gaussian function, consistent with clouds having broad, lower-density outer envelopes and narrow, higher-density inner layers. The ratio of the outer to inner envelope widths is ≈3:1. We hypothesize that these two components may be tracing a transition between atomic and diffuse molecular gas or between the unstable and cold neutral medium. Plummer-like models can also provide a good fit, with molecular clouds exhibiting shallow power-law wings with density, n, falling off like n−2 at large radii. Using Bayesian model selection, we find that parameterizing the clouds' profiles using a single Gaussian is disfavored. We compare our results with two-dimensional dust extinction maps, finding that the 3D dust recovers the total cloud mass from integrated approaches with fidelity, deviating only at higher levels of extinction (AV ≳ 2–3 mag). The 3D cloud structure described here will enable comparisons with synthetic clouds generated in simulations, offering unprecedented insight into the origins and fates of molecular clouds in the interstellar medium.

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 Dates: 2021-09-22
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/ac1f96
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 919 (1) Sequence Number: 35 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3