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- W2206851607 abstract "We present the study of three bright Early-Type galaxies hosted in groups or poor clusters: NGC 1399, NGC 1404 and NGC 507. We used ROSAT HRI, PSPC and, when available, higher resolution Chandra data to study the structure of the X-ray halo. The halo center of NGC 1399 and NGC 507 is dominated by a bright emission peak coincident with the position of the optical galaxy. This central peak is not explained by cooling flow models and is likely to be produced by kinetically heated stellar material. Within the effective radius, the hot gas distribution is tracing the galactic potential due to luminous matter. At larger distances the halo dynamics is dominated by dark matter extending on group and cluster scales. The NGC 1399 complex morphology further requires that the dark matter distribution has a hierarchical structure or that environmental effects are producing departures from hydrostatic equilibrium. We found significant density fluctuations in the hot gas distribution of both NGC 1399 and NGC 507, some of which are explained by the interaction of the radio-emitting plasma with the surrounding ISM. The remaining structures may be the result of galaxy-galaxy encounters, wakes produced by the motion of the galaxy through the ICM or may reflect the inhomogeneity of the cooling process invoked by many authors to explain the failure of the standard cooling-flow models. NGC 1404 represents a puzzling case since, despite its similarity with dominant cluster members, significant differences are found in the hot gas properties. These conflicting evidences can be explained by environmental effects, such as stifling of galactic winds by the ICM. Finally, we studied the population of discrete sources found in proximity of the two dominant galaxies." @default.
- W2206851607 created "2016-06-24" @default.
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- W2206851607 date "2002-04-29" @default.
- W2206851607 modified "2023-09-27" @default.
- W2206851607 title "X-ray Emission from Early-Type Galaxies in Groups and Poor Clusters" @default.
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