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Large number of dwarf galaxies discovered in the early universe

25 November 2016 Astronomy Now

Researchers have found a large population of distant dwarf galaxies that could reveal important details about a productive period of star formation in the universe billions of years ago. It is believed that dwarf galaxies played a significant role during the so-called reionisation era in transforming the dark early universe into one that is bright, ionised and transparent.

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Using oxygen as a tracer of galactic evolution

7 October 2016 Astronomy Now

A new study comprised of 7,000 galaxies casts light on how young, hot stars ionise oxygen in the early universe and the effects on the evolution of galaxies through time. The study presents the first measurements of the changing strengths of oxygen emission lines from the present day and back to 12.5 billion years ago.

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Study explains why galaxies stop creating stars

9 July 2016 Astronomy Now

The processes that cause galaxies to cease star formation are not well understood and constitute an outstanding problem in the study of the evolution of elliptical, spiral (such as the Milky Way) and irregular galaxies. Now, using a large sample of around 70,000 galaxies, a team of researchers may have an explanation for why some stop creating stars.

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Tracing star formation rates in distant galaxies

27 March 2016 Astronomy Now

To understand the physics of the evolution and formation of galaxies it is crucial to know at what rate galaxies form stars, referred to as the star-formation rate. A group of researchers used Earth- and space-based telescopes to create a complete multi-wavelength picture of distant galaxies.

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Dark matter satellites trigger massive birth of stars

9 March 2016 Astronomy Now

Astronomers have used computer simulations based on theoretical models to explain massive star formation observed in dwarf galaxies. Researchers in the US and the Netherlands found that during a dark matter satellite’s closest approach to a dwarf galaxy, through gravity it compresses the gas in the dwarf, triggering significant episodes of starbursts.