http://arxiv.org/abs/1812.05958
Intermediate-mass black holes are theoretically predicted but observationally elusive, and evidence for them is often indirect. The nearby face-on spiral galaxy NGC3310 has hosted many supernovae in recent history, and recent Chandra observations have shown a group of strong off-nuclear X-ray sources that are coincident with radio emission seen in archival VLA and MERLIN observations. Their luminosity, spectrum and off-nuclear location make these sources excellent IMBH candidates. To investigate this possibility, we used combined EVN/e-MERLIN observations at both 1.4 and 5 GHz to look for compact radio emission and evidence of jet activity. We detect a compact radio source within one arcsecond of a Chandra source with an estimated mass ${\rm M}{\rm BH}\sim3\times10^4 {\rm M}{\odot}$.
M. Argo, J. Coppola, M. Mezcua, et. al.
Mon, 17 Dec 18
10/71
Comments: Six pages, two figures. Contributed talk at the EVN Symposium, Granada, Spain, October 2018, to be published in POS
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