When gas dynamics decouples from galactic rotation: characterizing ism circulation in disk galaxies
Author
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Utreras, José
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Blanc, Guillermo
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Escala Astorquiza, Andrés
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Meidt, Sharon
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Emsellem, Eric
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Bigiel, Frank
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Glover, Simon C.O.
Author
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Henshaw, Jonathan
Author
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Hygate, Alex
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Diederik Kruijssen, J. M.
Author
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Rosolowsky, Erik
Author
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Schinnerer, Eva
Author
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Schruba, Andreas
Admission date
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2020-05-28T16:33:27Z
Available date
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2020-05-28T16:33:27Z
Publication date
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2020
Cita de ítem
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Astrophysical Journal (APR 2020) 892(2) : 94.
es_ES
Identifier
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10.3847/1538-4357/ab7a95
Identifier
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https://repositorio.uchile.cl/handle/2250/175060
Abstract
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In galactic disks, galactic rotation sets the bulk motion of gas, and its energy and momentum can be transferred toward small scales. Additionally, in the interstellar medium, random and noncircular motions arise from stellar feedback, cloud-cloud interactions, and instabilities, among other processes. Our aim is to comprehend to what extent small-scale gas dynamics is decoupled from galactic rotation. We study the relative contributions of galactic rotation and local noncircular motions to the circulation of gas, Gamma, a macroscopic measure of local rotation, defined as the line integral of the velocity field around a closed path. We measure the circulation distribution as a function of spatial scale in a set of simulated disk galaxies and model the velocity field as the sum of galactic rotation and a Gaussian random field. The random field is parameterized by a broken power law in Fourier space, with a break at the scale at which galactic rotation and noncircular motions contribute equally to Gamma. For our simulated galaxies, the gas dynamics at the scale of molecular clouds is usually dominated by noncircular motions, but in the center of galactic disks galactic rotation is still relevant. Our model shows that the transfer of rotation from large scales breaks at the scale , and this transition is necessary to reproduce the circulation distribution. We find that, and therefore the structure of the gas velocity field, is set by the local conditions of gravitational stability and stellar feedback.
es_ES
Patrocinador
dc.description.sponsorship
Carnegie Institution for Science.
Carnegie Sci-Comp Committee.
NLHPC: ECM-02.
Programa Nacional de Becas de Postgrado, CONICYT: D-21140839.
Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT): Basal AFB-170002.
Proyecto FONDECYT Regular grant: 1181663.
European Research Council (ERC): 726384.
German Research Foundation (DFG): KR4801/1-1
European Research Council (ERC): 714907.
BASAL PFB-06 CATA.
Anillo ACT-86.
FONDEQUIP AIC-57.
QUIMAL 130008.