Archive for the ‘M4’ Category

M4: Chandra locates X-ray sources and binaries

July 17, 2008

[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:

Chandra Press Release (April 28, 2008):

SEDS M4 page:

Recent Images and News of Messier Objects

July 15, 2008

M4 (and NGC 6397) from Chandra; April 28, 2008:

M31 and M101 by Galex, February 21, 2008:

M81 from Chandra; June 18, 2008:

M81 group (in particular, Arp’s Loop), from Hubble; January 8, 2008:

M81 group with radio clouds, from NRAO; January 10, 2008:

M82 in X-rays by XMM Newton:

M83 by Galex; April 16, 2008:

M106 by Galex; April 28, 2008:

Various THINGS galaxies, including M51, M63, M74, M81 and several M81 group dwarfs, by NRAO; January 10, 2008: