Images by Date
Images by Category
Solar System
White Dwarfs
Neutron Stars
Black Holes
Milky Way Galaxy
Normal Galaxies
Galaxy Clusters
Cosmology/Deep Field
Images by Interest
Space Scoop for Kids
Sky Map
Photo Blog
Top Rated Images
Image Handouts
Fits Files
Image Tutorials
Photo Album Tutorial
False Color
Cosmic Distance
Look-Back Time
Scale & Distance
Angular Measurement
Images & Processing
Image Use Policy
Web Shortcuts
Chandra Blog
RSS Feed
Email Newsletter
News & Noteworthy
Image Use Policy
Questions & Answers
Glossary of Terms
Download Guide
Get Adobe Reader
More Images of Perseus Cluster
Click for large jpg Chandra
Jpeg, Tif
Click for large jpg Chandra+ XMM full field
Jpeg, Tif

X-ray Images of Perseus Galaxy Cluster
A new study of the Perseus galaxy cluster, shown in these images from Chandra and XMM-Newton has revealed a mysterious X-ray signal in the data. This signal is represented in the circled data points in the inset, which is a plot of X-ray intensity as a function of X-ray energy. The signal is also seen in over 70 other galaxy clusters using XMM-Newton. This unidentified X-ray emission line - a spike of intensity centered on about 3.56 kiloelectron volts - requires further investigation to confirm both the signal's existence and nature. One possibility is this signal is from the decay of sterile neutrinos, one proposed candidate to explain dark matter.
(Credit: Chandra: NASA/CXC/SAO/E.Bulbul, et al.; XMM: ESA)

XMM gallery of galaxy clusters
A gallery of XMM-Newton images of 73 galaxy clusters, showing X-ray emission from hot gas. The X-ray spectra of these 73 galaxy clusters were "stacked" (added to each other), revealing a mysterious emission line.

Return to Perseus Cluster (June 23, 2014)