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The global star formation law by supernova feedback

Dekel, A; Sarkar, Kartick C.; Jiang, Fangzhou; Bournaud, F.; Krumholz, Mark; Ceverino, Daniel; Primack, Joel R.

Description

We address a simple model where the Kennicutt-Schmidt (KS) relation between the macroscopic densities of star formation rate (SFR, ρsfr) and gas (n) in galactic discs emerges from self-regulation of the SFR via supernova feedback. It arises from the physics of supernova bubbles, insensitive to the microscopic SFR recipe and not explicitly dependent on gravity. The key is that the filling factor of SFR-suppressed supernova bubbles self-regulates to a constant, f ∼ 0.5. Expressing the bubble...[Show more]

dc.contributor.authorDekel, A
dc.contributor.authorSarkar, Kartick C.
dc.contributor.authorJiang, Fangzhou
dc.contributor.authorBournaud, F.
dc.contributor.authorKrumholz, Mark
dc.contributor.authorCeverino, Daniel
dc.contributor.authorPrimack, Joel R.
dc.date.accessioned2020-07-21T01:46:25Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/206434
dc.description.abstractWe address a simple model where the Kennicutt-Schmidt (KS) relation between the macroscopic densities of star formation rate (SFR, ρsfr) and gas (n) in galactic discs emerges from self-regulation of the SFR via supernova feedback. It arises from the physics of supernova bubbles, insensitive to the microscopic SFR recipe and not explicitly dependent on gravity. The key is that the filling factor of SFR-suppressed supernova bubbles self-regulates to a constant, f ∼ 0.5. Expressing the bubble fading radius and time in terms of n, the filling factor is f∝Sn−s with s ≃ 1.5, where S is the supernova rate density. A constant f thus refers to ρsfr ∝ n1.5, with a density-independent SFR efficiency per free-fall time ∼0.01. The self-regulation to f ∼ 0.5 and the convergence to a KS relation independent of the local SFR recipe are demonstrated in cosmological and isolated-galaxy simulations using different codes and recipes. In parallel, the spherical analysis of bubble evolution is generalized to clustered supernovae, analytically and via simulations, yielding s ≃ 1.5 ± 0.5. An analysis of photoionized bubbles about pre-supernova stars yields a range of KS slopes but the KS relation is dominated by the supernova bubbles. Superbubble blowouts may lead to an alternative self-regulation by outflows and recycling. While the model is oversimplified, its simplicity and validity in the simulations may argue that it captures the origin of the KS relation.
dc.description.sponsorshipThis work was partly supported by the grants France-Israel PICS, GermanyIsrael GIF I-1341-303.7/2016, Germany-Israel DIP STE1869/2- 1 GE625/17-1, I-CORE Program of the PBC/ISF 1829/12, ISF 857/14, US-Israel BSF 2014-273, and NSF AST-1405962. The isolated-galaxy simulations were performed using the HPC resources of CINES and TGCC under the allocations A0030402192 and A0050402192 made by GENCI.
dc.format.extent26 pages
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherBlackwell Publishing Ltd
dc.rights© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.subjectstars, formation, supernovae, general, galaxies, evolution, galaxies, formation, galaxies, ISM
dc.titleThe global star formation law by supernova feedback
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume488
dcterms.dateAccepted2019-07-09
dc.date.issued2019-10
local.identifier.absfor020103 - Cosmology and Extragalactic Astronomy
local.identifier.absfor020104 - Galactic Astronomy
local.identifier.absfor020106 - High Energy Astrophysics; Cosmic Rays
local.identifier.ariespublicationu5786633xPUB1657
local.publisher.urlhttp://mnras.oxfordjournals.org/
local.type.statusPublished Version
local.contributor.affiliationDekel, A, The Hebrew University
local.contributor.affiliationSarkar, Kartick C., The Hebrew University
local.contributor.affiliationJiang, Fangzhou, The Hebrew University
local.contributor.affiliationBournaud, F., CEA Saclay
local.contributor.affiliationKrumholz, Mark, College of Science, The Australian National University
local.contributor.affiliationCeverino, Daniel, University of Copenhagen
local.contributor.affiliationPrimack, Joel R., University of California
local.description.embargo2037-12-31
local.identifier.essn1365-2966
local.bibliographicCitation.issue4
local.bibliographicCitation.startpage4753
local.bibliographicCitation.lastpage4778
local.identifier.doi10.1093/mnras/stz1919
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2020-04-12T08:21:33Z
local.identifier.thomsonIDWOS:000484349700024
CollectionsANU Research Publications

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