KINEMATIC SIGNATURES OF BULGES CORRELATE WITH BULGE MORPHOLOGIES AND SERSIC INDEX
Por:
Fabricius M.H., Saglia R.P., Fisher D.B., Drory N., Bender R., Hopp U.
Publicada:
20 jul 2012
Resumen:
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) approximate to 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 upsilon/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 turn
Filiaciones:
Fabricius M.H.:
Max Planck Institute for Extraterrestrial Physics, Giessenbachstrasse, D-85748 Garching, Germany
University Observatory Munich, Schienerstrasse 1, D-81679 Munich, Germany
Saglia R.P.:
Max Planck Institute for Extraterrestrial Physics, Giessenbachstrasse, D-85748 Garching, Germany
Fisher D.B.:
Laboratory of Millimeter Astronomy, University of Maryland, College Park, MD 29742, United States
Drory N.:
Univ Nacl Autonoma Mexico, Inst Astron, Mexico City 04510, DF, Mexico
Bender R.:
Max Planck Institute for Extraterrestrial Physics, Giessenbachstrasse, D-85748 Garching, Germany
University Observatory Munich, Schienerstrasse 1, D-81679 Munich, Germany
Hopp U.:
Max Planck Institute for Extraterrestrial Physics, Giessenbachstrasse, D-85748 Garching, Germany
University Observatory Munich, Schienerstrasse 1, D-81679 Munich, Germany
|