dc.contributor.author Henshaw, J. D. dc.contributor.author Ginsburg, A. dc.contributor.author Haworth, T. J. dc.contributor.author Longmore, S. N. dc.contributor.author Kruijssen, J. M. D. dc.contributor.author Mills, E. A. C. dc.contributor.author Sokolov, V. dc.contributor.author Walker, D. L. dc.contributor.author Barnes, A. T. dc.contributor.author Contreras, Y. dc.contributor.author Bally, J. dc.contributor.author Battersby, C. dc.contributor.author Beuther, H. dc.contributor.author Butterfield, N. dc.contributor.author Dale, James dc.contributor.author Henning, T. dc.contributor.author Jackson, J. M. dc.contributor.author Kauffmann, J. dc.contributor.author Pillai, T. dc.contributor.author Ragan, S. dc.contributor.author Riener, M. dc.contributor.author Zhang, Q. dc.date.accessioned 2019-05-14T14:05:19Z dc.date.available 2019-05-14T14:05:19Z dc.date.issued 2019-05-01 dc.identifier.citation Henshaw , J D , Ginsburg , A , Haworth , T J , Longmore , S N , Kruijssen , J M D , Mills , E A C , Sokolov , V , Walker , D L , Barnes , A T , Contreras , Y , Bally , J , Battersby , C , Beuther , H , Butterfield , N , Dale , J , Henning , T , Jackson , J M , Kauffmann , J , Pillai , T , Ragan , S , Riener , M & Zhang , Q 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 , vol. 485 , no. 2 , pp. 2457–2485 . https://doi.org/10.1093/mnras/stz471 dc.identifier.issn 0035-8711 dc.identifier.other PURE: 16711327 dc.identifier.other PURE UUID: f7b0d855-5883-434c-a9ad-b5185b82b9bc dc.identifier.other ArXiv: http://arxiv.org/abs/1902.02793v1 dc.identifier.uri http://hdl.handle.net/2299/21330 dc.description © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. dc.description.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 which 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, $\sigma_{v_{los}, {\rm 1D}}=4.4\pm2.1$ kms$^{-1}$, 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 $\sigma_{v_{los}, {\rm 1D}}/\sigma_{v_{pos}, {\rm 1D}}\sim1.2\pm0.3$. 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 \emph{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. en dc.format.extent 29 dc.language.iso eng dc.relation.ispartof Monthly Notices of the Royal Astronomical Society dc.rights Open dc.subject Galaxy: centre dc.subject ISM: clouds dc.subject ISM: kinematics and dynamics dc.subject ISM: structure dc.subject Stars: formation dc.subject Turbulence dc.subject Astronomy and Astrophysics dc.subject Space and Planetary Science dc.title 'The Brick' is not a brick : A comprehensive study of the structure and dynamics of the Central Molecular Zone cloud G0.253+0.016 en dc.contributor.institution Centre for Astrophysics Research dc.contributor.institution School of Physics, Astronomy and Mathematics dc.description.status Peer reviewed dc.identifier.url http://www.scopus.com/inward/record.url?scp=85063719666&partnerID=8YFLogxK dc.relation.school School of Physics, Astronomy and Mathematics dc.description.versiontype Final Accepted Version dcterms.dateAccepted 2019-05-01 rioxxterms.version AM rioxxterms.version AM rioxxterms.versionofrecord https://doi.org/10.1093/mnras/stz471 rioxxterms.licenseref.uri Other rioxxterms.type Journal Article/Review herts.preservation.rarelyaccessed true herts.rights.accesstype Open
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