'The Brick' is not a brick: A comprehensive study of the structure and dynamics of the Central Molecular Zone cloud G0.253+0.016
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.
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Semi-automated multi-COmponent Universal Spectral-line fitting Engine
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02/10/19 06:06PM
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BrunoPresents: @EmperorGrinnar @SylviaD32911201 @boggywood @watt4prez @FriendsOScience @CymaticWave @caerbannog666 @LeeLafferty4 @d_e_mol @DawnTJ90 @Mathenaut @JaggerMickOZ @Gladfly1 @GillesnFio @ClaireNewton79 @RegimeChangeBC @HughAbercrombi3 @truthtrumps1 @drwaheeduddin @andsnz @PAlterBoy1 @MichiganFront @AltUS_ARC @Mark_A_Lunn @torpet002 @StealthFlyBy @CriticalStress_ @brandondaly2018 @NikolovScience @MamaMac_ @Sci_Resistance @GeorgePembroke @Captbobdad @kevpluck @davestewart3 @hllsen @Lulzmouse @beegeerose @Carablades @tjipkoopmans @JWSpry @GetMyGist @bmartus5 @tan123 @realDonaldTrump @InfoWarsChannel @BarrettBrownLOL @algore @LifeIsThermal ‘The Brick’ is not a brick: A comprehensive study of the structure and dynamics of the Central Molecular Zone cloud G0.253+0.016 https://t.co/JWgPU0EouJ https://t.co/ZXuscDKfdL
TomHaworthAstro: Studying the properties of an intriguing giant molecular cloud towards the centre of our Galaxy. https://t.co/hyGXuITJjG Its been a pleasure to get back to working on star formation/the interstellar medium again.
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