Hα Imaging of X-Ray Luminous Early-Type Galaxies: Clues on the Hot, Warm and Cold Phases of the ISM
We report on the results of Hα imaging of a sample of 13 X-ray luminous early-type galaxies not at the center of clusters. We have detected Hα emission from 9 of these objects, with L H α = 4 x 1038 ÷ 4 x 1040 erg s -1(H 0 = 50km s -1 Mpc -1). The ionized gas is generally extended, but peaked at the nucleus and more concentrated than stars. In some cases it shows filaments, arcs and rings. We compare the properties of the warm phase of the ISM with those of the hot and cold ones, we discuss the possible ionizing mechanisms of the gas, finding that PAGB stars produce enough Lyman continuum photons, and we give an estimate of the mass of the ionized gas.
KeywordsRadio Galaxy Line Ratio Model Galaxy Dust Lane Radial Density Profile
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