Cited by 142Galaxies: Formation, Evolution, PhenomenaAstrophysical Phenomena and ObservationsAstrophysics and Star Formation Studies

A dynamical model for the formation of gas rings and episodic starbursts near galactic centres

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Krumholz, Mark R., Kruijssen, J. M. Diederik·2015·Monthly Notices of the Royal Astronomical Society

Abstract

We develop a simple dynamical model for the evolution of gas in the centres of barred spiral galaxies, using the Milky Way's Central Molecular Zone (CMZ, i.e. the central few hundred pc) as a case study. We show that, in the presence of a galactic bar, gas in a disc in the central regions of a galaxy will be driven inwards by angular momentum transport induced by acoustic instabilities within the bar's inner Lindblad resonance. This transport process drives turbulence within the gas that temporarily keeps it strongly gravitationally stable and prevents the onset of rapid star formation. However, at some point the rotation curve must transition from approximately flat to approximately solid body, and the resulting reduction in shear reduces the transport rates and causes gas to build up, eventually producing a gravitationally unstable region that is subject to rapid and violent star formation. For the observed rotation curve of the Milky Way, the accumulation happens ∼100 pc from the centre of the Galaxy, in good agreement with the observed location of gas clouds and young star clusters in the CMZ. The characteristic time-scale for gas accumulation and star formation is of the order of 10–20 Myr. We argue that similar phenomena should be ubiquitous in other barred spiral galaxies.

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Crossref · 10.1093/mnras/stv1670

Cites

160 of 160 references verified0 citation errors · 0 not checkable

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  • Gas transiting from the x1 to the x2 orbit does not form stars because of its high-velocity dispersion due to shear in a flat rotation curve.

    “Gas transiting from the x 1 to the x 2 orbit, however, does not form stars because of its high-velocity dispersion due to the shear in a flat rotation curve.”

    From The Fermi/eROSITA bubbles: a look into the nuclear outflow from the Milky Way (2024) · cites this paper as Krumholz & Kruijssen 2015

    Section 5.5 says that rapid inflow has instability-driven velocity dispersion that makes the gas unable to collapse and form stars; Section 4.1 links the instability and transport to shear where the rotation curve is close to flat. But Section 5.5 says the model assumes gas has already been transferred from x1 to x2 orbits by shocks, so it does not establish this explanation specifically for gas during that transition. Page numbers are unavailable in our copy. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • Gas settles down to the x2 orbit and starts forming stars only after reaching a solid body rotation regime where shear-driven turbulence and angular momentum transport is suppressed.

    “The gas settles down to the x 2 orbit and starts forming stars only after reaching a solid body rotation regime where the shear-driven turbulence and angular momentum transport is suppressed (Krumholz & Kruijssen 2015).”

    From The Fermi/eROSITA bubbles: a look into the nuclear outflow from the Milky Way (2024) · cites this paper as Krumholz & Kruijssen 2015

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Cites

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Research works printed but not linked: 3

  1. Binney J., Tremaine S., 1987, Galactic Dynamics. Princeton Univ. Press, Princeton, NJ
  2. Chabrier G., 2005, in Corbelli E., Palla F., Zinnecker H., eds, Astrophysics and Space Science Library, Vol. 327, The Initial Mass Function 50 Years Later. Springer, Dordrecht, p.
  3. Thompson T. A., Krumholz M. R., 2014, preprint (arXiv:e-prints)

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Authors
Krumholz, M. R., & Kruijssen, J. M. D.
Affiliations
  • University of California, Santa Cruz (US)
  • Max Planck Society (DE)
Corresponding author
Krumholz, Mark R.
Venue
Monthly Notices of the Royal Astronomical Society
Published
2015-08-17
Volume
453
Issue
1
Pages
739-757
ISSN
  • 0035-8711 (ISSN-L)
  • 1365-2966
OpenAlex
W2103211077
Cited by
142
References
160
Citations by year
2026: 3 · 2025: 10 · 2024: 11 · 2023: 7 · 2022: 11 · 2021: 10 · 2020: 17 · 2019: 14 · 2018: 15 · 2017: 24 · 2016: 16 · 2015: 4
FWCI
11.19
Type
journal article
Language
en
Open access
Locations
  • Monthly Notices of the Royal Astronomical Society (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • HighWire Press Open Archive (submittedVersion)
  • ANU Open Research (Australian National University) (submittedVersion)
  • MPG.PuRe (Max Planck Society) (submittedVersion)
  • arXiv (Cornell University)
Funders
  • National Science Foundation (1066293, 0955300, 1405962)
  • Aspen Center for Physics (1066293, PHY-1066293)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysical Phenomena and Observations
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysics and Star Formation Studies
Keywords
gas rings, galactic bars, barred spiral galaxies, Central Molecular Zone, Milky Way, gas inflow, angular momentum transport, acoustic instability, inner Lindblad resonance, gas turbulence, gravitational instability, rotation curves, star formation, gas accumulation

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