The PN.S ETG survey
Abstract
We have analyzed the velocity fields in the halos of thirty-three early-type galaxies (ETGs) with planetary nebulae (PNs) as tracers, reaching radii of up to ~8R e . The sample comprises twenty-five galaxies from the Planetary Nebulae Spectrograph (PN.S) ETG survey and eight further galaxies with extended PN velocity data from the literature and new Counter-Dispersed imaging observations. The catalogues from these thirty-three ETGs provide astrometric positions and heliocentric line-of-sight velocities for a total of 8354 extragalactic PNs. All these catalogues are treated homogeneously for the identification of kinematic outliers and the separation between main galaxy/satellites in each galaxy field-of-view. We discuss the rotation velocities, velocity dispersion profiles and radial trends of the specific angular momentum, separating between slow rotators and fast rotators. We compare the properties of the V/σ(R) and σ(R) profiles with predictions of 2D velocity fields from hydro-dynamical cosmological simulations. We briefly mention the possible origin of the quasi-Keplerian steeply decreasing profile galaxies which encompasses about one fourth of the current sample.
- Publication:
-
Planetary Nebulae: Multi-Wavelength Probes of Stellar and Galactic Evolution
- Pub Date:
- October 2017
- DOI:
- 10.1017/S1743921317000771
- Bibcode:
- 2017IAUS..323..279A
- Keywords:
-
- ISM: planetary nebulae: general. Galaxies: elliptical and lenticular;
- cD;
- evolution;
- formation;
- halos;
- kinematics and dynamics