Sizes, colour gradients and resolved stellar mass distributions for the massive cluster galaxies in XMMUJ2235-2557 at z = 1.39
Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 458:3 (2016) 3181-3209
The atlas 3D Project – XXXI. Nuclear radio emission in nearby early-type galaxies
Monthly Notices of the Royal Astronomical Society Oxford University Press 458:2 (2016) 2221-2268
Abstract:
We present the results of a high-resolution, 5 GHz, Karl G. Jansky Very Large Array study of the nuclear radio emission in a representative subset of the ATLAS3D survey of early-type galaxies (ETGs). We find that 51 ± 4 per cent of the ETGs in our sample contain nuclear radio emission with luminosities as low as 1018 W Hz-1. Most of the nuclear radio sources have compact (≲25-110 pc) morphologies, although ~10 per cent display multicomponent core+jet or extended jet/lobe structures. Based on the radio continuum properties, as well as optical emission line diagnostics and the nuclear X-ray properties, we conclude that the majority of the central 5 GHz sources detected in the ATLAS3D galaxies are associated with the presence of an active galactic nucleus (AGN). However, even at subarcsecond spatial resolution, the nuclear radio emission in some cases appears to arise from low-level nuclear star formation rather than an AGN, particularly when molecular gas and a young central stellar population is present. This is in contrast to popular assumptions in the literature that the presence of a compact, unresolved, nuclear radio continuum source universally signifies the presence of an AGN. Additionally, we examine the relationships between the 5 GHz luminosity and various galaxy properties including the molecular gas mass and - for the first time - the global kinematic state. We discuss implications for the growth, triggering, and fuelling of radio AGNs, as well as AGN-driven feedback in the continued evolution of nearby ETGs.The KMOS GTO Cluster Program: Absorption Line Spectroscopy of Cluster Galaxies at z∼1.5
MULTI-OBJECT SPECTROSCOPY IN THE NEXT DECADE: BIG QUESTIONS, LARGE SURVEYS, AND WIDE FIELDS 507 (2016) 281-285
The SAMI Pilot Survey: stellar kinematics of galaxies in Abell 85, 168 and 2399
Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 454:2 (2015) 2050-2066
The initial mass functions of M31 and M32 through far red stellar absorption features
Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 452:1 (2015) 597-606