The Origin of X-Ray Emission from Low Velocity Dispersion Groups

Details The Origin of X-Ray Emission from Low Velocity Dispersion Groups The Origin of X-Ray Emission from Low Velocity Dispersion Groups

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000cxo..prop..693p&link_type=abstract

Chandra Proposal ID #02800479

Physics

Chandra Proposal Id #02800479

Scientific paper

Low velocity dispersion (sigma) groups have shallow potentials, and should retain rather little hot gas if the intergalactic medium has been preheated during the process of galaxy formation, as has been suggested recently. However, some groups with low sigma have X-ray luminosities so high that the L:sigma relation is observed to be flatter in groups than in clusters. If this `excess' luminosity is truly diffuse gas, then the preheating model is in serious difficulty. Alternatively, there could be new sources of X-ray emission in these groups such as intergalactic shocks, which may be related to their evolutionary state. We propose to image five of the most extreme low sigma/high L_X groups with ACIS to find out.

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