The Atlas3D project -- XXXI. Nuclear radio emission in nearby early-type galaxies
Kristina Nyland, Lisa M. Young, Joan M. Wrobel, Marc Sarzi, Raffaella, Morganti, Katherine Alatalo, Leo Blitz, Frederic Bournaud, Martin Bureau,, Michele Cappellari, Alison F. Crocker, Roger L. Davies, Timothy A. Davis, P., T. de Zeeuw, Pierre-Alain Duc, Eric Emsellem

TL;DR
This study uses high-resolution radio observations to analyze nuclear radio emission in early-type galaxies, revealing that about half host low-luminosity AGNs, with some emission arising from star formation, challenging assumptions about radio sources indicating AGNs.
Contribution
First detailed high-resolution radio survey of nearby early-type galaxies linking radio emission to galaxy properties and nuclear activity.
Findings
51% of ETGs contain nuclear radio emission
Most sources are compact, with some showing jet structures
Radio emission often associated with AGN, but sometimes from star formation
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% of the ETGs in our sample contain nuclear radio emission with luminosities as low as 10^18 W/Hz. Most of the nuclear radio sources have compact (< 25-110 pc) morphologies, although < 10% display multi-component 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 sub-arcsecond spatial resolution, the nuclear radio emission in some cases appears to arise from low-level nuclear star…
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