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Compass and Scale Image of Galaxy Cluster MACS J0025.4-1222
About the Object
- R.A. PositionR.A. PositionRight ascension – analogous to longitude – is one component of an object's position.00h 25m 29.79s
- Dec. PositionDec. PositionDeclination – analogous to latitude – is one component of an object's position.-12° 22' 46.98"
- ConstellationConstellationOne of 88 recognized regions of the celestial sphere in which the object appears.Cetus
- DistanceDistanceThe physical distance from Earth to the astronomical object. Distances within our solar system are usually measured in Astronomical Units (AU). Distances between stars are usually measured in light-years. Interstellar distances can also be measured in parsecs.This object has a redshift of z = 0.586. It is on the order of billions of light-years away.
- DimensionsDimensionsThe physical size of the object or the apparent angle it subtends on the sky.This image is 3.2 arcminutes (4.2 million light-years or 1.3 million parsecs) wide.
About the Data
- Data DescriptionData DescriptionProposal: A description of the observations, their scientific justification, and the links to the data available in the science archive.
Science Team: The astronomers who planned the observations and analyzed the data. "PI" refers to the Principal Investigator.HST Proposal: 10703 PI H. Ebeling, University of Hawaii) and 11100: PI M. Bradac (University of California, Santa Barbara). The image was was composited with X-ray data from the Chandra X-ray Observatory's Advanced CCD Imaging Spectrograph, from proposals: 3251 and 5010: PI S. Allen (Stanford University). The science team includes: M. Bradac (University of California, Santa Barbara), S. Allen (Stanford University), T. Treu (University of California, Santa Barbara), H. Ebeling (University of Hawaii), R. Massey (Royal Observatory, Edinburgh), and G. Morris, A. von der Linden, and D. Applegate (Stanford University). - InstrumentInstrumentThe science instrument used to produce the data.HST>ACS/WFC, HST>WFPC2 , and CXO>ACIS
- Exposure DatesExposure DatesThe date(s) that the telescope made its observations and the total exposure time.November 5, 2006 and June 6, 2007
- FiltersFiltersThe camera filters that were used in the science observations.HST: F450W (B), F555W (V), and F814W (I) ACIS: X-ray
- Object NameObject NameA name or catalog number that astronomers use to identify an astronomical object.MACS J0025.4-1222
- Object DescriptionObject DescriptionThe type of astronomical object.Galaxy Cluster
- Release DateAugust 27, 2008
- Science ReleaseA Clash of Clusters Provides New Clue to Dark Matter
- Credits
Color Info
Color InfoA brief description of the methods used to convert telescope data into the color image being presented.
The image is a composite of separate exposures made by Hubble Space Telescope ACS and WFPC2 detectors and the Chandra ACIS detector. The color results from assigning different hues (colors) to each monochromatic image. In this case, the assigned colors are: Pink (ordinary matter/hot gas): X-ray Blue (dark matter map): F450W (B) Yellow/cyan: F555W (V), + F814W (I)
Compass and Scale
Compass and ScaleAn astronomical image with a scale that shows how large an object is on the sky, a compass that shows how the object is oriented on the sky, and the filters with which the image was made.
Related Images & Videos
Hubble and Chandra Composite of the Galaxy Cluster MACS J0025.4-1222
A powerful collision of galaxy clusters has been captured by NASA's Hubble Space Telescope and Chandra X-ray Observatory. This clash of clusters provides striking evidence for dark matter and insight into its properties. The observations of the cluster known as MACS J0025.4-1222...
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Details
Last Updated
Mar 14, 2025
Contact
Media
Claire Andreoli
NASA’s Goddard Space Flight Center
Greenbelt, Maryland
claire.andreoli@nasa.gov
