Images by Date
Images by Category
Solar System
Stars
White Dwarfs
Supernovas
Neutron Stars
Black Holes
Milky Way Galaxy
Normal Galaxies
Quasars
Galaxy Clusters
Cosmology/Deep Field
Miscellaneous
Images by Interest
Space Scoop for Kids
Multiwavelength
Sky Map
Constellations
3D Wall
Photo Blog
Top Rated Images
Image Handouts
Desktops
High Res Prints
Fits Files
Image Tutorials
Photo Album Tutorial
False Color
Cosmic Distance
Look-Back Time
Scale & Distance
Angular Measurement
Images & Processing
AVM/Metadata
Getting Hard Copies
Image Use Policy
Web Shortcuts
Chandra Blog
RSS Feed
Chandra Mobile
Chronicle
Email Newsletter
News & Noteworthy
Image Use Policy
Questions & Answers
Glossary of Terms
Download Guide
Get Adobe Reader
More Images of Abell 644 and SDSS J1021+131
1
Click for large jpg X-ray
Jpeg, Tif, PS
Click for large jpgOptical
Jpeg, Tif, PS

X-ray and Optical Images of Galaxy Cluster Abell 644
Abell 644 is in the center of a galaxy cluster that lies about 920 million light years from Earth. At the center of this galaxy is a growing supermassive black hole, called an active galactic nucleus (AGN) by astronomers, which is pulling in large quantities of gas.
(Credit: X-ray: NASA/CXC/Northwestern Univ/D.Haggard et al, Optical: SDSS)
2
Click for large jpg X-ray
Jpeg, Tif, PS
Click for large jpg Optical
Jpeg, Tif, PS

X-ray and Optical Images of Field Galaxy SDSS J1021+131
This is an isolated, or "field," galaxy named SDSS J1021+1312, which is located about 1.1 billion light years away A survey of these and hundreds of other galaxies tells scientists how often the biggest black holes in field galaxies like SDSS J1021+131 have been active over the last few billion years. This has important implications for how environment affects black hole growth.
(Credit: X-ray: NASA/CXC/Northwestern Univ/D.Haggard et al, Optical: SDSS)
3
SDSS J1021+131 with Scale Bar
(Credit: X-ray: NASA/CXC/Northwestern Univ/D.Haggard et al, Optical: SDSS)
4
Abell 644 with Scale Bar
(Credit: X-ray: NASA/CXC/Northwestern Univ/D.Haggard et al, Optical: SDSS)


Return to Abell 644 and SDSS J1021+131 (December 20, 2010)