M4: Chandra locates X-ray sources and binaries

[M4 in X-rays, CXO]

Globular clusters M4 and NGC 6397 have got their central parts imaged by Chandra X-ray Observatory, among a total of 13 Milky Way Globular Clusters. Astronomers found that contrary to expectation, denser M4, with its higher rate of stellar encounters, has less binaries and hot X-ray sources than less dense NGC 6397.

Credit: NASA/CXC/Northwestern Univ/John Fregeau

Chandra image:
http://chandra.harvard.edu/photo/2008/gclust/

Chandra Press Release (April 28, 2008):
http://chandra.harvard.edu/press/08_releases/press_042808.html

SEDS M4 page:
http://www.seds.org/messier/m/m004.html

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