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Date and Time of the Query: 2019-04-24 T21:49:17 PDT
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For refcode 2012ApJ...754...67F:
Retrieve 45 NED objects in this reference.
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2012ApJ...754...67F Kinematic Signatures of Bulges Correlate with Bulge Morphologies and Sersic Index Fabricius, Maximilian H.; Saglia, Roberto P.; Fisher, David B.; Drory, Niv; Bender, Ralf; Hopp, Ulrich Abstract. We use the Marcario Low Resolution Spectrograph at the Hobby-Eberly Telescope to study the kinematics of pseudobulges and classical bulges in the nearby universe. We present major axis rotational velocities, velocity dispersions, and h_3_ and h_4_ moments derived from high-resolution (sigma_inst_ ~ 39 km s^--1^) spectra for 45 S0 to Sc galaxies; for 27 of the galaxies we also present minor axis data. We combine our kinematics with bulge-to-disk decompositions. We demonstrate for the first time that purely kinematic diagnostics of the bulge dichotomy agree systematically with those based on Sersic index. Low Sersic index bulges have both increased rotational support (higher v/sigma values) and on average lower central velocity dispersions. Furthermore, we confirm that the same correlation also holds when visual morphologies are used to diagnose bulge type. The previously noted trend of photometrically flattened bulges to have shallower velocity dispersion profiles turns out to be significant and systematic if the Sersic index is used to distinguish between pseudobulges and classical bulges. The anti-correlation between h_3_ and v/sigma observed in elliptical galaxies is also observed in intermediate-type galaxies, irrespective of bulge type. Finally, we present evidence for formerly undetected counter-rotation in the two systems NGC 3945 and NGC 4736. This paper includes data taken at The McDonald Observatory of The University of Texas at Austin. Key words: galaxies: bulges, galaxies: formation, galaxies: general, galaxies: kinematics and dynamics, galaxies: photometry, galaxies: spiral, galaxies: structure
Retrieve 45 NED objects in this reference.
Please click here for ADS abstract

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