This tag is associated with 113 posts

Counting Stellar Corpses: Rethinking the Variable Initial Mass Function?

Sometimes stellar remnants cannibalize other stars, emitting x-rays that can be detected in distant galaxies. Learn how making a careful tally of these gruesome events can reveal how stars are formed.

Over My Dead Body: Keeping Dead Galaxies from Forming New Stars

The authors of this paper pursued a mechanism which could possibly keep dead galaxies from forming new stars: mass ejected from AGB stars moving through the galaxy could heat the ambient gas.

How do satellite galaxies orbit their host?

Satellite galaxies orbiting a host galaxy seem to display highly anisotropic angular distributions.

Tipping the Spherical Cow: The Initial Conditions of Star Formation

Spherical cows have a long and storied history in physics, but does this type of crude approximation lead to realistic conclusions in the case of star formation? The combination of large- and small- scale simulations tests this idea.

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?

Mature Galaxies in an Immature Universe

The authors use a deep survey to locate rare galaxies which were among the earliest to form.

UR #14: Tully-Fisher and Sauron

What are these Sauron-like double-horned profiles? Read this week’s undergrad research feature to find out!

A Tale of Two Star Cities

How do we reproduce what happened previously in a galaxy-galaxy interaction when all we have is one snapshot in time?

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.

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