448 citations · 4.1k across the 101 of their papers we have counts for
6 papers · 1 filter
Cold gas in group-dominant elliptical galaxies
E. O'Sullivan, F. Combes, S. Hamer +3
We present IRAM 30m telescope observations of the CO(1-0) and (2-1) lines in a sample of 11 group-dominant elliptical galaxies selected from the CLoGS nearby groups sample. Our obs…
Molecular Gas in the X-ray Bright Group NGC 5044 as Revealed by ALMA
Laurence P. David, Jeremy Lim, William Forman +17
A short 30 minute ALMA observation of the early-type galaxy NGC 5044, which resides at the center of an X-ray bright group with a moderate cooling flow, has detected 24 molecular s…
Deep Chandra Observations of HCG 16 - II. The Development of the Intra-group Medium in a Spiral-Rich Group
E. O'Sullivan, J. M. Vrtilek, L. P. David +6
We use a combination of deep Chandra X-ray observations and radio continuum imaging to investigate the origin and current state of the intra-group medium in the spiral-rich compact…
Deep Chandra Observations of HCG 16 - I. Active Nuclei, Star formation and Galactic Winds
E. O'Sullivan, A. Zezas, J. M. Vrtilek +6
We present new, deep Chandra X-ray and Giant Metrewave Radio Telescope 610~MHz observations of the spiral-galaxy-rich compact group HCG 16, which we use to examine nuclear activity…
First Results from the Complete Local-Volume Groups Sample
Ewan O'Sullivan, Konstantinos Kolokythas, Somak Raychaudhury +2
Galaxy groups form the environment of the majority of galaxies in the local Universe, and many host an extended hot intra-group medium whose radiative cooling appears to fuel, and…
Radio properties of nearby groups of galaxies
Konstantinos Kolokythas, Ewan O'Sullivan, Somak Raychaudhury +2
Much of the evolution of galaxies takes place in groups where feedback has the greatest impact on galaxy formation. By using an optically selected, statistically complete sample of…