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SDSS

This tag is associated with 34 posts

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.

The Changing Faces of Active Galactic Nuclei

Has a multi-wavelength study of AGN across a large redshift range revealed that these energetic giants do not impact upon their host galaxy as significantly as previously thought?

Bars as Drivers of Galactic Evolution

Galactic bars have long been associated with many processes affecting galactic evolution. This paper studies how bars affect the star formation rate, mass and structure of a large sample of morphologically classified galaxies.

Galaxy Zoo 2 Flowchart

Galaxy Zoo 2: Return of the Citizen Scientist

Galaxy Zoo is a citizen science project that uses volunteers to classify galaxies from the Sloan Digitial Sky Survey as spiral or elliptical. Now the Galaxy Zoo 2 catalogue has gone public, with even more detailed classifications of galaxies, including bars, bulges, spiral arms, and round and squashed ellipticals.

Data to the Extreme

Lots and lots more data from the Sloan Digital Sky Survey.

Circling problems with our model of the Universe: what can groups of galaxies tell us about Lambda CDM?

Measurements of the circular velocities in groups of galaxies can test whether our current cosmology is correct.

Enhanced star formation in interacting galaxies: how far does it reach?

Star formation is enhanced when two galaxies interact or merge. But what is the orbital extent of enhanced star formation in interacting galaxies? At which projected separation of the two galaxies does it disappear?

The mass assembly of Milky Way-like galaxies

The central question of this Letter is how and when the Milky Way assembled its stellar mass. This issue is addressed by tracing the formation history of spiral galaxies which closely resemble the Milky Way.

The cosmic density of dust

Grab the vacuum cleaner… it’s cosmic DUST!

Dust is really ubiquitous in the Universe: it is everywhere from our Solar System to stars and the interstellar medium. However, the observations of dust in galaxies fall short of the prediction of how much dust there is in the Universe. In this work, the authors try to alleviate this problem by estimating the amount of dust present in clouds of gas that inhabit galaxy halos while they look for clues regarding the origin of these clouds.

Observing the Velocity Anisotropy of Cluster Galaxies

Title: Spatial Anisotropy of Galaxy Kinematics in Sloan Digital Sky Survey Galaxy Clusters First Author: Skielboe, A. Galaxy clusters are beautifully simple, but also fantastically complicated structures. For many years, astronomers have treated these systems as spherical cows, but simulations and observations have repeatedly shown that clusters exhibit triaxial rather than spherical shapes with nice […]

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