Compass and Scale Image of Galaxy Cluster MACS J0025.4-1222
This object has a redshift of z = 0.586. It is on the order of billions of light-years away.
This image is 3.2 arcminutes (4.2 million light-years or 1.3 million parsecs) wide.
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).
HST: F450W (B), F555W (V), and F814W (I)
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)