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Date and Time of the Query: 2019-05-22 T05:47:23 PDT
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For refcode 2012ApJ...759...64L:
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Copyright by American Astronomical Society. Reproduced by permission
2012ApJ...759...64L Cores and the Kinematics of Early-type Galaxies Lauer, Tod R. Abstract. I have combined the Emsellem et al. ATLAS^3D^ rotation measures of a large sample of early-type galaxies with Hubble Space Telescope based classifications of their central structure to characterize the rotation velocities of galaxies with cores. "Core galaxies" rotate slowly, while "power-law galaxies" (galaxies that lack cores) rotate rapidly, confirming the analysis of Faber et al. Significantly, the amplitude of rotation sharply discriminates between the two types in the --19 > M_V_ > --22 domain over which the two types coexist. The slow rotation in the small set of core galaxies with M_V_ > --20, in particular, brings them into concordance with the more massive core galaxies. The ATLAS^3D^ "fast-rotating" and "slow-rotating" early-type galaxies are essentially the same as power-law and core galaxies, respectively, or the Kormendy & Bender two families of elliptical galaxies based on rotation, isophote shape, and central structure. The ATLAS^3D^ fast rotators do include roughly half of the core galaxies, but their rotation amplitudes are always at the lower boundary of that subset. Essentially, all core galaxies have ATLAS^3D^ rotation amplitudes {lambda}_{R_e/2}_<= 0.25, while all galaxies with {lambda}_{R_e/2}_>0.25 and figure eccentricity >0.2 lack cores. Both figure rotation and the central structure of early-type galaxies should be used together to separate systems that appear to have formed from "wet" versus "dry" mergers. Key words: galaxies: nuclei, galaxies: photometry, galaxies: structure
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