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Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.1501s&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #15.01; Bulletin of the American Astronomical Society, Vol. 24, p.1143
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1
Scientific paper
ROSAT High Resolution Imager (HRI) X-ray images were obtained for three clusters of galaxies which contain strong cooling flows, A2029, A2597, and 2A0335+096. These observations confirm that gas is cooling at rates of dot M_c ~ 370 M_sun yr(-1) in A2029 and dot M_c ~ 262 M_sun yr(-1) in 2A0335+096. In all three clusters, the X-ray emission from the inner cooling flow regions (r >~ 100 kpc) is inhomogeneous. In A2029 and 2A0335+096, the X-ray surface brightness is dominated by a number of X-ray emitting filaments. Using the crude spectral resolution of the HRI, we show that these filaments are the result of excess emission, rather than foreground X-ray absorption. Although there are uncertainties in the pointing, many of the X-ray features in the cooling flow region of 2A0335+096 correspond to features in Hα optical line emission. This may indicate that the 10(4) K gas originates through the cooling of hot X-ray emitting gas. The gas is the filaments is too dense to be in hydrostatic equilibrium, and it is likely that other forces such as rotation, turbulence, and magnetic fields influence the dynamical state of the gas. The filaments may be supported in part by magnetic fields and may be connected with the filaments of very strong Faraday rotation seen in several nearly cooling flows. It is possible that the inhomogeneities in the gas lead to the disruption of Wide-Angle-Tail radio galaxies in these systems. This research was supported by NASA ROSAT grants NAG 5--1577 and NAG 5--1891.
McNamara Brian R.
O'Connell Robert West
Sarazin Craig L.
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