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News Release Archive:

News Release 100 of 291

May 15, 2007 01:00 PM (EDT)

News Release Number: STScI-2007-17

Hubble Finds Ring of Dark Matter

Technical facts about this news release:

About the Object
Object Name: Cl 0024+17, ZwCl 0024+1652
Object Description: Galaxy Cluster
Position (J2000): R.A. 00h 26m 35s
Dec. +17° 09' 43"
Constellation: Pisces
Distance: Approximately 5 billion light-years (1.5 billion parsecs); Redshift z = 0.395
Dimensions: This image is roughy 3 arcminutes wide.
About the Data
Data Description:

The ACS data was from the HST proposal 10325: H. Ford (Johns Hopkins University), N. Benitez (Johns Hopkins University/Instituto de Astrofisica de Andalucia), T. Broadhurst (Tel Aviv University - Wise Observatory), R. White (STScI), K. Zekser (Johns Hopkins University), and D. Coe (Johns Hopkins University/Instituto de Astrofisica de Andalucia).

The science team includes: M.J. Jee and H. Ford (Johns Hopkins University), G. Illingworth (UCO/Lick Observatory, University of California, Santa Cruz), R. White (STScI), T. Broadhurst (Tel Aviv University - Wise Observatory), D. Coe (Johns Hopkins University/Instituto de Astrofisica de Andalucia), G. Meurer and A. van der Wel (Johns Hopkins University), N. Benitez (Johns Hopkins University/Instituto de Astrofisica de Andalucia), J. Blakeslee (Washington State University), R. Bouwens (UCO/Lick Observatory, University of California, Santa Cruz), L. Bradley , R. Demarco, N. Homeier, A. Martel, and S. Mei (Johns Hopkins University).

Instrument: ACS/WFC
Exposure Date(s): November 2004
Exposure Time: 14.5 hours
Filters: F435W (B), F475W (g), F555W (V), F625W (r), F775W (i), and F850LP (z)
About the Image
Image Credit: NASA, ESA, and M.J. Jee (Johns Hopkins University)
Release Date: May 15, 2007
Color:

This image is a composite of many separate exposures made by the ACS instrument on the Hubble Space Telescope. In total, six filters were used to sample light from broad and narrow wavelengths. The color results from assigning different hues (colors) to each monochromatic image. In this case, the assigned colors are:

F435W (B), F475W (g) blue
F555W (V), F625W (r) green
F775W (i), and F850LP (z) red
Dark Matter "Ring" Derived from Hubble Data cyan

 

Orientation: Searching for Dark Matter in a Galaxy Cluster