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Why massive galaxies don't dance in crowds

Bringing some of the mysteries of the universe a little closer to home.

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Owlscrying
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Unread post Thu Aug 10, 2017 7:46 pm

Scientists have discovered why heavyweight galaxies living in a dense crowd of galaxies tend to spin more slowly than their lighter neighbours.

"Contrary to earlier thinking, the spin rate of the galaxy is determined by its mass, rather than how crowded its neighbourhood is," says study first author Associate Professor Sarah Brough of UNSW Sydney and the ARC Centre of Excellence for All-sky Astrophysics, CAASTRO.

The finding, based on a detailed study of more than 300 galaxies, is published in the Astrophysical Journal.

To measure how fast their galaxies rotated, the researchers used an instrument called the Sydney-AAO Multi-object Integral field spectrograph (SAMI) on the 4-metre Anglo-Australian Telescope in eastern Australia.

SAMI 'dissects' galaxies, obtaining optical spectra from 61 points across the face of each galaxy, 13 galaxies at a time.

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Owlscrying
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Unread post Thu Aug 10, 2017 7:48 pm

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Credit: NASA, ESA, and R. Dupke (Eureka Scientific, Inc.), et al.

Galaxy cluster Abell 2744, imaged with the Hubble Space Telescope. The cluster lies in the constellation of Sculptor and contains several hundred galaxies

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Owlscrying
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Unread post Thu Aug 10, 2017 7:49 pm



This fulldome video shows the galaxy cluster Abell 2744, which was observed by the ESA/Hubble Space Telescope as part of the Frontier Fields programme. Using the effect of gravitational lensing caused by the mass of the cluster, this programme allows astronomers to study some of the earliest galaxies in the Universe.

 
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Samanthaj
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Unread post Fri Aug 18, 2017 12:08 pm

Lokah samastah sukhino bhavantu

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