Conditions for supernovae driven galactic winds

Abstract

We point out that the commonly assumed condition for galactic outflows, that supernovae (SNe) heating is efficient in the central regions of starburst galaxies, suffers from invalid assumptions. We show that a large filling factor of hot ($\ge 10^6$ K) gas is difficult to achieve through SNe heating, irrespective of the initial gas temperature and density, and of its being uniform or clumpy. We instead suggest that correlated supernovae from OB associations in molecular clouds in the central region can drive powerful outflows if the molecular surface density is $>10^3$ M${}_{\odot }$ pc${}^{-2}$.

4 pages; To appear in ApJ Letters; Comments welcome

References in corpus (4)

• The Role of Pressure in GMC Formation II: The H_2 - Pressure Relation
• The Starburst-Driven Molecular Wind in NGC 253 and the Suppression of Star Formation
• On the Density Distribution in Star-forming Interstellar Clouds
• Star Formation On Sub-kpc Scale Triggered By Non-linear Processes In Nearby Spiral Galaxies

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• Cosmological Galaxy Evolution with Superbubble Feedback I: Realistic Galaxies with Moderate Feedback
• Complexes of triggered star formation in supergiant shell of Holmberg II
• Evolution of multiple supernova remnants
• Long way to go: how outflows from large galaxies propagate through the hot halo gas
• Fast Winds Drive Slow Shells: A Model for the Circumgalactic Medium as Galactic Wind-Driven Bubbles
• INFERNO: Galactic winds in dwarf galaxies with star-by-star simulations including runaway stars
• Evolution of clustered supernovae
• Dynamics of a Supernova Envelope in a Cloudy Interstellar Medium
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• The interstellar medium and feedback in the progenitors of the compact passive galaxies at z~2
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• Re-Examining Astrophysical Constraints on the Dark Matter Model
• Molecular outflows in starburst nuclei
• A star-forming dwarf galaxy candidate in the halo of NGC 4634
• A MARVEL-ous study of how well galaxy shapes reflect Dark Matter halo shapes in Cold Dark Matter Simulations
• Unveiling the formation of NGC 2915 with MUSE: A counter-rotating stellar disk embedded in a disordered gaseous environment
• Disc-halo gas outflows driven by stellar clusters as seen in multiwavelength tracers