A dark cluster of galaxies at redshift z=1

Article Abstract:

Scientists have identified a far-off source of X-rays from the lensed quasi-stellar object labelled MG2016 + 112 (refs 1,2). The emission is like that of galaxy clusters elsewhere in the space region because they contain thermal bremsstrahlung radiation from a hot metal-rich, diffuse gaseous halo. The X-ray galaxy cluster may contain astronomical objects which have never been seen before, indicating that the theoretical description of metal enrichment process in galaxy clusters needs to be reviewed.

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Discovery of a hierarchical distribution of dark matter in the Fornax cluster of galaxies

Article Abstract:

X-ray observations were conducted on gas found in the Fornax cluster of galaxies. The X-ray satellite Advanced Satellite for Cosmology and Astrophysics provided high-quality data. Dark matter was found to be distributed on at least two distinct length scales, one of the dominant central galaxy and the other of the cluster as a whole. The results indicate the existence of a hierarchy in dark matter distribution.

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A population of faint galaxies that contribute to the cosmic X-ray background

Article Abstract:

A survey was undertaken that was a 100 times more sensitive than previous studies n the 2-10 keV band. Many faint resolved sources were found with integrate flux accounting for 30% of the X-ray background int he range. The average spectrum of the resolved source is harder than nearby bright active galactic nuclei and near to the spectrum of the X-ray background radiation.

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