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galaxy clusters

This tag is associated with 36 posts

Weighing galaxy clusters with the CMB

Measuring CMB distortions caused by gravitational lensing is a unique way of estimating galaxy cluster masses.

El Gordo: A Spectacular(… and Theoretically Impossible?) Merger

The El Gordo (in Spanish, “the fat one”), one of the most massive galaxy clusters observed, is an active merger of two large subclusters. Unraveling its dynamics provides insights into $latex \Lambda$CDM.

Searching for Galaxy Clusters with the SZ Effect

The Sunyaev-Zeldovich effect is a unique way of searching for galaxy clusters that complements multi-wavelength imaging efforts.

How does structure grow? Understanding the Meszaros effect

Explore an astrophysical classic describing the effect of the Universe’s expansion on the seeds 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.

Dark in the Lightness

New results from stacked weak lensing measurements of over a hundred thousand galaxies show that, on large scales, light from stars appears to trace the dark matter distribution of the Universe remarkably well.

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.

An example showing a model SED fit to observation

What came before clusters? Protoclusters

A galaxy cluster in the act of forming reveals some interesting details about the lives of galaxies.

Cartography of the Local Cosmos

Astronomers map out the local universe in a way that is both intuitive and fascinating, marking the birth of the new science of “Cosmography”.

Ram pressure stripping: a classic paper

A classic 1972 paper by Jim Gunn and J. Richard Gott, III describing the growth of clusters from primordial density perturbations and, most famously, the importance of ram pressure stripping in explaining the observed lack of spiral galaxies towards the center of clusters.

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