Energizing the disk-halo at different redshifts

linking the cosmic evolution of gas and star formation in galaxies

A. M. Hopkins, N. M. McClure-Griffiths, B. M. Gaensler

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

The cosmic star formation history is known to evolve strongly, by an order of magnitude, out to a redshift about unity. Over the same time period, the average neutral gas density in galaxies evolves only marginally, by a factor of about two. The star formation rate density is high enough that the observed neutral gas in galaxies would be exhausted within about a gigayear in the absence of replenishment, and the question becomes one of what form the replenishment takes. For the observed neutral hydrogen mass density to remain constant or only slowly evolving, the replenishment must balance the consumption. Observations of gas infall and outflows in nearby galaxies suggest there may be insufficient infalling material to balance the consumption, though, raising the question of whether a new mechanism for replenishment may be required. We present a mechanism for replenishment that is associated with star formation, supershells within galaxies, and discuss the advantages and limitations of this mechanism.

Original languageEnglish
Title of host publicationThe role of the disk-halo interaction in galaxy evolution
Subtitle of host publicationoutflows vs. infall?
EditorsMiguel A. de Avillez
Place of PublicationFrance
PublisherEDP Sciences
Pages135-142
Number of pages8
ISBN (Print)9782759807871
DOIs
Publication statusPublished - 2012
Externally publishedYes
EventThe Role of the Disk-Halo Interaction in Galaxy Evolution: Outflows vs. Infall? - Espinho, Portugal
Duration: 18 Aug 200822 Aug 2008

Publication series

NameEAS Publications Series
Volume56
ISSN (Print)1633-4760
ISSN (Electronic)1638-1963

Other

OtherThe Role of the Disk-Halo Interaction in Galaxy Evolution: Outflows vs. Infall?
CountryPortugal
CityEspinho
Period18/08/0822/08/08

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