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`The Brick' is not a brick: a comprehensive study of the structure and dynamics of the central molecular zone cloud G0.253+0.016

MPS-Authors

Henshaw,  J. D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ginsburg,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Haworth,  T. J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Longmore,  S. N.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kruijssen,  J. M. D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Mills,  E. A. C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sokolov,  V.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Walker,  D. L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Barnes,  A. T.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Contreras,  Y.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bally,  J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Battersby,  C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Beuther,  H.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Butterfield,  N.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Dale,  J. E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Henning,  T.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Jackson,  J. M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kauffmann,  J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pillai,  T.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ragan,  S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Riener,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zhang,  Q.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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Citation

Henshaw, J. D., Ginsburg, A., Haworth, T. J., Longmore, S. N., Kruijssen, J. M. D., Mills, E. A. C., et al. (2019). `The Brick' is not a brick: a comprehensive study of the structure and dynamics of the central molecular zone cloud G0.253+0.016. Monthly Notices of the Royal Astronomical Society, 485, 2457-2485.


Cite as: https://hdl.handle.net/21.11116/0000-0005-D36D-3
Abstract
In this paper we provide a comprehensive description of the internal dynamics of G0.253+0.016 (a.k.a. `the Brick'); one of the most massive and dense molecular clouds in the Galaxy to lack signatures of widespread star formation. As a potential host to a future generation of high-mass stars, understanding largely quiescent molecular clouds like G0.253+0.016 is of critical importance. In this paper, we reanalyse Atacama Large Millimeter Array cycle 0 HNCO J = 4(0, 4) - 3(0, 3) data at 3 mm, using two new pieces of software that we make available to the community. First, SCOUSEPY, a Python implementation of the spectral line fitting algorithm SCOUSE. Secondly, ACORNS (Agglomerative Clustering for ORganising Nested Structures), a hierarchical n-dimensional clustering algorithm designed for use with discrete spectroscopic data. Together, these tools provide an unbiased measurement of the line-of-sight velocity dispersion in this cloud, σ _{v_{ los}, 1D}=4.4± 2.1 km s-1, which is somewhat larger than predicted by velocity dispersion-size relations for the central molecular zone (CMZ). The dispersion of centroid velocities in the plane of the sky are comparable, yielding σ _{v_{ los}, 1D}/σ _{v_{ pos}, 1D}~ 1.2± 0.3. This isotropy may indicate that the line-of-sight extent of the cloud is approximately equivalent to that in the plane of the sky. Combining our kinematic decomposition with radiative transfer modelling, we conclude that G0.253+0.016 is not a single, coherent, and centrally condensed molecular cloud; `the Brick' is not a brick. Instead, G0.253+0.016 is a dynamically complex and hierarchically structured molecular cloud whose morphology is consistent with the influence of the orbital dynamics and shear in the CMZ.