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

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 $\sim$ 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 $\sim$ 200 pc. This galaxy also has a $\sigma$-drop in the centre, which may be related to both stellar components in counterrotation or with a kinematically cold star-forming region.

18 pages, 7 figures, 2 tables, accepted for publication in MNRAS

References in corpus (15)

• Overview of the SDSS-IV MaNGA Survey: Mapping Nearby Galaxies at Apache Point Observatory
• The SAURON project -- IX. A kinematic classification for early-type galaxies
• The SAURON project -- X. The orbital anisotropy of elliptical and lenticular galaxies: revisiting the (V/sigma,epsilon) diagram with integral-field stellar kinematics
• The SAMI Galaxy Survey: instrument specification and target selection
• The SAURON project - VIII. OASIS/CFHT integral-field spectroscopy of elliptical and lenticular galaxy centres
• PCA Tomography: how to extract information from datacubes
• Distribution of Slow and Fast Rotators in the Fornax Cluster
• The Black Hole Mass and Extreme Orbital Structure in NGC1399
• Gemini/GMOS IFU stellar kinematics of the nuclear region of six nearby active galaxies
• A treatment procedure for VLT/SINFONI data cubes: application to NGC 5643
• Integral field unit spectroscopy of 10 early type galactic nuclei: I - Principal component analysis Tomography and nuclear activity
• An off-centered active galactic nucleus in NGC 3115
• Lifetime of nuclear velocity dispersion drops in barred galaxies
• IFU spectroscopy of 10 early-type galactic nuclei - III. Properties of the circumnuclear gas emission
• IFU spectroscopy of 10 early type galactic nuclei: II - Nuclear emission line properties

Cited by in corpus (8)

• Gemini NIFS survey of feeding and feedback processes in nearby Active Galaxies: I - Stellar kinematics
• Fornax 3D project: automated detection of planetary nebulae in the centres of early-type galaxies and first results
• The MASSIVE Survey XIII -- Spatially Resolved Stellar Kinematics in the Central 1 kpc of 20 Massive Elliptical Galaxies with the GMOS-North Integral-Field Spectrograph
• Galaxies with kinematically distinct cores in Illustris
• The DIVING${}^{3D}$ Survey -- Deep IFS View of Nuclei of Galaxies -- I. Definition and Sample Presentation
• IFU observations of the inner 200 pc of NGC 4546: gas rotation, non-circular motions and ionised outflows
• Measuring the mass of the supermassive black hole of the lenticular galaxy NGC 4546
• What Drives the Bimodal Distribution of Eddington-Scaled Radio Luminosity in Nearby Early-Type Galaxies?