Skip to main content

The Physical Nature of Starburst-driven Galactic Outflows

Author(s): Schneider, Evan E; Ostriker, Eve C; Robertson, Brant E; Thompson, Todd A

To refer to this page use:
Abstract: We present the fourth simulation of the Cholla Galactic OutfLow Simulations suite. Using a physically motivated prescription for clustered supernova feedback, we successfully drive a multiphase outflow from a disk galaxy. The high resolution (<5 pc) across a relatively large domain (20 kpc) allows us to capture the hydrodynamic mixing and dynamical interactions between the hot and cool (T similar to 10(4) K) phases in the outflow, which in turn leads to direct evidence of a qualitatively new mechanism for cool gas acceleration in galactic winds. We show that mixing of momentum from the hot phase to the cool phase accelerates the cool gas to 800 km s(-1) on kiloparsec scales, with properties inconsistent with the physical models of ram pressure acceleration or bulk cooling from the hot phase. The mixing process also affects the hot phase, modifying its radial profiles of temperature, density, and velocity from the expectations of radial supersonic flow. This mechanism provides a physical explanation for the high-velocity, blueshifted, low-ionization absorption lines often observed in the spectra of starburst and high-redshift galaxies.
Publication Date: 20-May-2020
Electronic Publication Date: 22-May-2020
Citation: Schneider, Evan E, Ostriker, Eve C, Robertson, Brant E, Thompson, Todd A. (2020). The Physical Nature of Starburst-driven Galactic Outflows. ASTROPHYSICAL JOURNAL, 895 (10.3847/1538-4357/ab8ae8
DOI: doi:10.3847/1538-4357/ab8ae8
ISSN: 0004-637X
EISSN: 1538-4357
Related Item:
Type of Material: Journal Article
Journal/Proceeding Title: ASTROPHYSICAL JOURNAL
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

Items in OAR@Princeton are protected by copyright, with all rights reserved, unless otherwise indicated.