Evidence for AGN Feedback in Galaxy Clusters and Groups
Figure 1
(a) The green contours outlining the 330 MHz radio emission from Lane et al. [164] are overlaid onto the 0.5–7.5 keV Chandra image of the galaxy cluster Hydra A (). The extended radio lobes fill a large-scale system of X-ray cavities and are surrounded by a “cocoon’’ shock. See also Sections 5.6 and 5.8. adapted from Nulsen et al. [116]. (b) Very Large Array (VLA) radio contours overlaid onto the 0.5–7.0 Chandra image of the galaxy cluster RBS 797 (). The subarsec resolution radio image shows the details of the innermost 4.8 GHz radio jets (blue contours), which clearly point in a north-south direction. Remarkably, these inner jets are almost perpendicular to the axis of the 1.4 GHz emission observed at resolution (green contours), which is elongated in the northeast-southwest direction filling the X-ray cavities. Adapted from Gitti et al. [130]. (c) 0.3–2 keV Chandra image of the galaxy group NGC 5813 () with 1.4 GHz VLA (blue) and 235 MHz Giant Metrewave Radio Telescope (green) radio contours overlaid. The image shows two pairs of cavities, plus an outer cavity to the northeast, two sharp edges to the northwest and southeast, and bright rims around the pair of inner cavities. Adapted from Randall et al. [157]. (d) 235 MHz GMRT contours overlaid on the smoothed 0.5–2.0 keV Chandra image of the compact group HCG 62 (). The radio source shows a disturbed morphology with inner lobes clearly filling the well-defined X-ray cavities, but with outer lobes having no associated X-ray cavities (see also Section 5.4). Adapted from Gitti et al. [153].
