Cold gas outflows from the Small Magellanic Cloud traced with ASKAP

Abstract:

Feedback from massive stars plays a critical part in the evolution of the Universe by driving powerful outflows from galaxies that enrich the intergalactic medium and regulate star formation. An important source of outflows may be the most numerous galaxies in the Universe: dwarf galaxies. With small gravitational potential wells, these galaxies easily lose their star-forming material in the presence of intense stellar feedback,. Here, we show that a nearby dwarf galaxy—the Small Magellanic Cloud—has atomic hydrogen outflows extending at least 2 kiloparsecs from the star-forming bar of the galaxy. The outflows are cold (< 400 K) and may have formed during a period of active star formation 25–60 Myr ago,. The total mass of atomic gas in the outflow is about 107 solar masses (that is, about 3 per cent of the total atomic gas of the galaxy). The inferred mass flux in atomic gas alone, \documentclass[12pt]{minimal …

Año de publicación:

2018

Keywords:

Fuente:

google