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galaxy evolution

This tag is associated with 80 posts

Measuring Galaxy Star Formation

How well do the current methods of measuring the star formation rate of galaxies match then known star formation rate in simulations?

Shutting off Star Formation in Galaxies

As galaxies evolve they eventually stop forming stars. There are a host of (sometimes violent) processes that can end star formation in galaxies. The authors examine how galaxy mass plays a role in stopping star formation for nearby galaxies.

The History of the Galactic Halo

The number and luminosity distribution of white dwarfs stars can be used to help figure out the past history of the Galactic halo.

Bars: Star Mixologists

Can bars in a galaxy cause radial migrations of stars? The simulations say yes, but these observations suggest otherwise…

Fishing for Jellyfish in Galaxy Clusters

The evolution of galaxies from one type to another is not well understood. A galaxy’s environment plays a key role in its evolution. This is especially important for galaxies in galaxy clusters, which can strip them of their gas. The authors in today’s Astrobite explore six new, dramatic examples of galaxies being stripped of their gas.

Minor Mergers are Minor Players

Once thought to be the main mechanism by which galaxies feed their star formation; the authors of this paper find that minor mergers cannot account for the observed star formation rates of galaxies.

Something from Nothing: Simulating our Universe

High resolution computational simulations are a valuable means by which Astronomers test our understanding of the Universe, and make predictions. The world of computational astrophysics broke new ground recently with the highest resolution cosmological simulation to date, Illustris, making for some spectacular science and some spectacular images.

Bulgeless galaxies with growing black holes

Mergers make bulges in galaxies and black holes generally live in bulges, so mergers must grow black holes – simple. That was until we found bulgeless galaxies containing growing black holes…

Two roads through the green valley

Large surveys of galaxies have revealed a bimodal color distribution: most galaxies tend to be red or blue, leaving a gap in the middle known as the green valley. The authors of this paper use morphologies provided by the Galaxy Zoo project to show that not all galaxies take the same quick path through the green valley.

Compact Galaxies in the Nearby Universe

Small and massive compact galaxies are some of the hardest galaxies to find, but they could potentially reveal how galaxies evolved in the early universe.

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