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News Release Archive:

News Release 119 of 950

March 2, 2012 09:00 AM (EST)

News Release Number: STScI-2012-10

Dark Matter Core Defies Explanation in Hubble Image

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Image: Galaxy Cluster Abell 520's Mass (HST WFPC2)

Galaxy Cluster Abell 520's Mass (HST WFPC2)

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ABOUT THIS IMAGE:

This image shows the location of most of the mass in merging galaxy cluster Abell 520's core, which is dominated by dark matter. Dark matter is an invisible substance that makes up most of the universe's mass. The dark-matter map was derived from Hubble Wide Field Planetary Camera 2 observations, by detecting how light from distant objects is distorted by the cluster galaxies, an effect called gravitational lensing.

Abell 520 resides 2.4 billion light-years away.

Object Name: Abell 520

Image Type: Astronomical

Credit: NASA, ESA, and M.J. Jee (University of California, Davis)

NEWS RELEASE IMAGES

The above image is part of a montage:

Montage Image: Galaxy Cluster Abell 520 (plus CFHT, HST, CFHT/HST, and CXO overlays) Image Type: Astronomical/Annotated Galaxy Cluster Abell 520 (plus CFHT, HST, CFHT/HST, and CXO overlays)PRC2012-10b Galaxy Cluster Abell 520 (HST-CFHT-CXO Composite) Image Type: Astronomical Galaxy Cluster Abell 520 (HST-CFHT-CXO Composite) Galaxy Cluster Abell 520 (CFHT and HST) Image Type: Astronomical Galaxy Cluster Abell 520 (CFHT and HST) Galaxy Cluster Abell 520's Luminosity (CFHT) Image Type: Astronomical Galaxy Cluster Abell 520's Luminosity (CFHT) Galaxy Cluster Abell 520's Hot Gas (Chandra) Image Type: Astronomical Galaxy Cluster Abell 520's Hot Gas (Chandra)

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