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By analyzing the gas temperature maps created from the Chandra archive data, we reveal the prevailing existence of temperature substructures on ∼ 100 h 70 kpc scales in the central regions of nine intermediate-redshift (z ≈ 0.1) galaxy clusters, which resemble those found in the Virgo and Coma Clusters. Each substructure contains a clump of hot plasma whose(More)
This paper presents a new jamming attack in wireless LANs that deliberately targets uplink TCP acknowledgements (TCP-ACKs) of downlink TCP flows. To ensure immunity to detection with existing schemes, in this attack, the attacker does not jam the target constantly; instead, it relies on our probabilistic estimation model to forecast the time when its(More)
To study systematically the evolution on the angular extents of the galaxy, ICM, and dark matter components in galaxy clusters, we compiled the optical and X-ray properties of a sample of 340 clusters with redshifts < 0.5, based on all the available data with the Sloan Digital Sky Survey (SDSS) and Chandra/XMMNewton. For each cluster, the member galaxies(More)
We present a Chandra study of the metal distribution in the X-ray bright compact group of galaxies HCG 62. We find that the diffuse X-ray emission is peaked at the core of the central galaxy NGC 4778, and is dominated by the contribution of the hot gas. The diffuse emission is roughly symmetric within ≃ 0.25, which is straddled by double-sided X-ray(More)
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