Theory and Observations of Galactic Outflows

A special issue of Galaxies (ISSN 2075-4434).

Deadline for manuscript submissions: closed (31 August 2018) | Viewed by 14137

Special Issue Editors


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Guest Editor
Max Planck Institute for Astronomy, Germany
Interests: AGN outflows; galaxy evolution; dual AGN; IFU surveys; AGN variability

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Guest Editor
Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg, 69120 Heidelberg, Germany
Interests: AGN feedback and its role in galaxy evolution; AGN and feedback signatures; galaxy kinematics; IFU surveys; built-up of structure in the universe

E-Mail Website
Guest Editor
Max Planck Institute for Astronomy, Germany
Interests: galactic outflows; chemical abundance; chemical evolution; IFU surveys

Special Issue Information

Dear Colleagues,

The regulation of star formation appears to be a key ingredient in the evolution of galaxies across cosmic time. One of the main issues in galaxy evolution across cosmic time regards regulating star formation processes in galaxies and the built-up of their mass. Galactic Outflows, which are capable of lifting gas from their galaxies out to their halo, is one important process to be considered in conjunction with gas fueling and the efficiency of forming stars. While Galactic Outflows have been observed in various types of galaxies and can be driven by star formation, active galactic nuclei (AGN), powerful radio jets and shocks, a coherent physical picture has not emerged yet. Nevertheless, simple theoretical prescriptions of Galactic Outflows have successfully been implemented into cosmological simulation to reproduce key properties of galaxy populations. Furthermore, high-resolution simulations on the interactions with Galactic Outflows and the complex multi-phase medium in galaxies have been performed, but observations are necessary to constrain physical model parameters.

In this Special Issue, we aim to review and collect original work on both observations and theory of Galactic Outflows. The emphasis here is to develop an understanding of the properties of Galactic Outflows with the goal of obtaining a perspective of their impact on the evolution of galaxies. Some of the non-exhaustive list of key topics to be covered are given as examples:

  • Detection and surveys of Galactic outflows
  • Estimation and measurements of Galactic outflow energetics
  • Driving mechanisms of Galactic outflows
  • Observations and theory of the multi-phase nature of Galactic outflows
  • Connecting simulations and observations of Galactic outflows
  • The fate of the outflowing material: escaping versus falling back
  • Triggering of Galactic Outflows and their expansion through the galaxy
  • The immediate vs. long-term impact of Galactic Outflows on galaxy evolution

Submission of reviews, as well as focused research articles, are welcome.

Dr. Bernd Husemann
Dr. Dominika Wylezalek
Dr. I-Ting Ho
Guest Editors

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Keywords

  • Galactic outflows
  • AGN
  • Starburst galaxies
  • radio jets
  • star formation
  • galaxy evolution

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Published Papers (2 papers)

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Review

24 pages, 2562 KiB  
Review
A Review of Recent Observations of Galactic Winds Driven by Star Formation
by David S. N. Rupke
Galaxies 2018, 6(4), 138; https://doi.org/10.3390/galaxies6040138 - 9 Dec 2018
Cited by 93 | Viewed by 5683
Abstract
Galaxy-scale outflows of gas, or galactic winds (GWs), driven by energy from star formation are a pivotal mechanism for regulation of star formation in the current model of galaxy evolution. Observations of this phenomenon have proliferated through the wide application of old techniques [...] Read more.
Galaxy-scale outflows of gas, or galactic winds (GWs), driven by energy from star formation are a pivotal mechanism for regulation of star formation in the current model of galaxy evolution. Observations of this phenomenon have proliferated through the wide application of old techniques on large samples of galaxies, the development of new methods, and advances in telescopes and instrumentation. I review the diverse portfolio of direct observations of stellar GWs since 2010. Maturing measurements of the ionized and neutral gas properties of nearby winds have been joined by exciting new probes of molecular gas and dust. Low-z techniques have been newly applied in large numbers at high z. The explosion of optical and near-infrared 3D imaging spectroscopy has revealed the complex, multiphase structure of nearby GWs. These observations point to stellar GWs being a common feature of rapidly star-forming galaxies throughout at least the second half of cosmic history, and suggest that scaling relationships between outflow and galaxy properties persist over this period. The simple model of a modest-velocity, biconical flow of multiphase gas and dust perpendicular to galaxy disks continues to be a robust descriptor of these flows. Full article
(This article belongs to the Special Issue Theory and Observations of Galactic Outflows)
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46 pages, 2465 KiB  
Review
A Review of the Theory of Galactic Winds Driven by Stellar Feedback
by Dong Zhang
Galaxies 2018, 6(4), 114; https://doi.org/10.3390/galaxies6040114 - 1 Nov 2018
Cited by 82 | Viewed by 7259
Abstract
Galactic winds from star-forming galaxies are crucial to the process of galaxy formation and evolution, regulating star formation, shaping the stellar mass function and the mass-metallicity relation, and enriching the intergalactic medium with metals. Galactic winds associated with stellar feedback may be driven [...] Read more.
Galactic winds from star-forming galaxies are crucial to the process of galaxy formation and evolution, regulating star formation, shaping the stellar mass function and the mass-metallicity relation, and enriching the intergalactic medium with metals. Galactic winds associated with stellar feedback may be driven by overlapping supernova explosions, radiation pressure of starlight on dust grains, and cosmic rays. Galactic winds are multiphase, the growing observations of emission and absorption of cold molecular, cool atomic, ionized warm and hot outflowing gas in a large number of galaxies have not been completely understood. In this review article, I summarize the possible mechanisms associated with stars to launch galactic winds, and review the multidimensional hydrodynamic, radiation hydrodynamic and magnetohydrodynamic simulations of winds based on various algorithms. I also briefly discuss the theoretical challenges and possible future research directions. Full article
(This article belongs to the Special Issue Theory and Observations of Galactic Outflows)
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