477 citations · 2k across the 54 of their papers we have counts for
4 papers · 1 filter
HCG 57: Evidence for shock-heated intergalactic gas from X-rays and optical emission line spectroscopy
Ewan O'Sullivan, P. N. Appleton, B. A. Joshi +5
We present Chandra and XMM-Newton X-ray observations of the compact group HCG 57, and optical integral field spectroscopy of the interacting galaxy pair HCG 57A/D. These two spiral…
Probing the high frequency variability of NGC 5044: the key to AGN feedback
Gerrit Schellenberger, Ewan O'Sullivan, Laurence David +10
The active galactic nucleus (AGN) feeding and feedback process in the centers of galaxy clusters and groups is still not well understood. NGC 5044 is the ideal system in which to s…
A Deep Dive into the NGC 741 Galaxy Group: Insights into a Spectacular Head-Tail Radio Galaxy from VLA, MeerKAT, uGMRT and LOFAR
K. Rajpurohit, E. O'Sullivan, G. Schellenberger +17
We present deep, wideband multifrequency radio observations (144 MHz8 GHz) of the remarkable galaxy group NGC 741, which yield crucial insights into the interaction between the…
A hot core in the group-dominant elliptical galaxy NGC 777
Ewan O'Sullivan, Kamlesh Rajpurohit, Gerrit Schellenberger +8
NGC 777 provides an example of a phenomenon observed in some group-central ellipticals, in which the temperature profile shows a central peak, despite the short central cooling tim…