IFU spectroscopy of 10 early-type galactic nuclei - IV. Properties of the circumnuclear stellar kinematics

Author(s)

Ricci, T. V. ; Steiner, J. E. ; Menezes, R. B.

• Document type: Journal article
• Source: Monthly Notices of the Royal Astronomical Society; v. 463, n. 4, p. 3860-3875, DEC 2016.
• Web of Science Citations: 2

Abstract

The study of stellar kinematic properties may provide hints on the formation and evolution of elliptical and lenticular galaxies. Although most previous studies have focused on the large scale of these galaxies, their central regions (scales of similar to 100 pc) may contain important clues about their structure, such as kinematically decoupled cores. This is the fourth paper on a sample of 10 massive (sigma > 200 km s(-1)) and nearby (d < 31 Mpc) early-type galaxies, observed with the integral field unit of the Gemini South Multi Object Spectrograph. Here, we analyse the properties of the stellar kinematics in the circumnuclear region. We fitted the line-of-sight velocity distribution with a Gauss-Hermite function. In seven galaxies of the sample, we detected a rotation pattern in their radial velocity maps that are anti-correlated with h(3). We interpret this as stellar structures in rotation embedded in the bulges of the objects. Comparing the stellar kinematic results with the PCA Tomography results and also with the gas kinematic results of IC 5181, it seems that this object may have a non-axisymmetric potential at its centre. The velocity dispersion maps of four objects have a nuclear peak, which must correspond, in part, to unresolved stellar rotation. In NGC 1404, we detected a kinematic decoupled core with an extension of similar to 200 pc. This galaxy also has a sigma-drop in the centre, which may be related to both stellar components in counter-rotation or with a kinematically cold star-forming region. (AU)

• FAPESP's process: 12/21350-7 - Nuclear and circumnuclear low ionization emission in massive galaxies.
• Grantee: Tiago Vecchi Ricci
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 11/51680-6 - Exploring the universe: from the galaxies formation to Earth-like planets with the Giant Magellan Telescope
• Grantee: Laerte Sodré Junior
• Support Opportunities: Special Projects
• FAPESP's process: 08/06988-0 - Characterization and environment of low luminosity active nuclei
• Grantee: Tiago Vecchi Ricci
• Support Opportunities: Scholarships in Brazil - Doctorate