The MASSIVE Survey – V. Spatially resolved stellar angular momentum, velocity dispersion, and higher moments of the 41 most massive local early-type galaxies

We present spatially-resolved two-dimensional stellar kinematics for the 41 most massive early-type galaxies (M K -25.7 mag, stellar mass M * 10 11.8 M ) of the volume-limited (D < 108 Mpc) MASSIVE survey. For each galaxy, we obtain highquality spectra in the wavelength range of 3650 to 5850 from the 246-fiber Mitchell integral-field spectrograph (IFS) at McDonald Observatory, covering a 107 107 field of view (often reaching 2 to 3 effective radii). We measure the 2-D spatial distribution of each galaxy's angular momentum ( and fast or slow rotator status), velocity dispersion (), and higher-order non-Gaussian velocity features (Gauss-Hermite moments h 3 to h 6 ). Our sample contains a high fraction ( 80%) of slow and non-rotators with 0.2. When combined with the lower-mass ETGs in the ATLAS 3D survey, we find the fraction of slow-rotators to increase dramatically with galaxy mass, reaching 50% at M K -25.5 mag and 90% at M K -26 mag. All of our fast rotators show a clear anti-correlation between h 3 and V /, and the slope of the anti-correlation is steeper in more round galaxies. The radial profiles of show a clear luminosity and environmental dependence: the 12 most luminous galaxies in our sample (M K -26 mag) are all brightest cluster/group galaxies (except NGC 4874) and all have rising or nearly flat profiles, whereas five of the seven "isolated" galaxies are all fainter than M K = -25.8 mag and have falling . All of our galaxies have positive average h 4 ; the most luminous galaxies have average h 4 0.05 while less luminous galaxies have a range of values between 0 and 0.05. Most of our galaxies show positive radial gradients in h 4 , and those galaxies also tend to have rising profiles. We discuss the implications for the relationship among dynamical mass, , h 4 , and velocity anisotropy for these massive galaxies.