This tag is associated with 25 posts

Away From it All: Dwarf Galaxies in Voids

Nature vs. nurture in the evolution of galaxies is not completely understood. Where a galaxy is found, its environment, can play an important role in determining the properties of that galaxy. This may not always be true, however.

More hypervelocity stars are jetting out of the galaxy

Palladino et al. find 13 new hypervelocity star candidates in the galaxy and find they probably do not originate from the center of the galaxy.

The (not so) Sordid History of the Small Magellanic Cloud

The authors of today’s paper find out just what kind of star formation history lies in the Milky Way’s next meal: The Small Magellanic Cloud. After all, they say you are what you eat.

Unveiling the friend of a pulsar

What kind of star is orbiting around a millisecond pulsar and where did it come from?

Tracking the Chemical Evolution of Galaxies Over the Last 11 Billion Years

In this article, the authors measure the stellar mass-metallicity relation for star forming galaxies ranging to z~2.3. They find that mass-metallicity relationship for these galaxies evolves with time and also that it flattens at late times.

Evidence for two distinct populations of Type Ia Supernovae

Type Ia Supernovae are extensively used in astronomy research, but the progenitors of these massive explosions are still not well understood. This paper discusses new evidence that there are two distinct populations of type Ia supernovae, and that they originate from different stellar populations.

Using a Lens to Look Back in Time

Using massive gravitational lenses can help us study the evolution of galaxies over unprecedented time scales.

The galaxy’s red giant bones

“Galactic archaeology” is the term that has come to refer to using the motions and chemical compositions of stars of different ages to learn about the history of the Milky Way. It seems to me that “galactic paleontology” might be a bit more accurate. I hope to see galactic archaeology v. galactic paleontology fought out in the comments!

Molecular gas not required for star formation?

Stars forming in atomic gas?? Maybe so, if the metallicity is low!

Calcium and Color: Measurements of Bimodality in Globular Cluster Metallicities

In this paper, the SLUGGS team explores an alternate way to determine the metallicity of a globular cluster based on the calcium triplet rather than color. Previous studies have shown what appear to be two peaks in the metallicity of the population of globular clusters surrounding early-type galaxies – a bimodal distribution – but some astronomers have pointed out that the way we measure metallicity in globular clusters can make a unimodal distribution in metallicity appear as a bimodal one. The SLUGGS team recalibrates the calcium triplet relation and surveys 903 clusters around 11 galaxies, and finds a similar bimodal distribution, implying that most massive galaxies undergo at least two star formation episodes.

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