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Jet ejection by accreting black holes is a mass invariant mechanism unifyingstellar and supermassive black holes (SMBHs) that should also apply forintermediate-mass black holes (IMBHs), which are thought to be the seeds fromwhich SMBHs form. We present the detection of an off-nuclear IMBH of $\sim$5$\times$ 10$^{4}$ M$_\odot$ located in an unusual spiral arm of the galaxy NGC2276 based on quasi-simultaneous \textit{Chandra} X-ray observations andEuropean VLBI Network (EVN) radio observations. The IMBH, NGC2276-3c, possessesa 1.8 pc radio jet that is oriented in the same direction as large-scale($\sim$650 pc) radio lobes and whose emission is consistent with flat tooptically thin synchrotron emission between 1.6 GHz and 5 GHz. Its jet kineticpower ($4 \times 10^{40}$ erg s$^{-1}$) is comparable to its radiative outputand its jet efficiency ($\geq$ 46\%) is as large as that of SMBHs. A region of$\sim$300 pc along the jet devoid of young stars could provide observationalevidence of jet feedback from an IMBH. The discovery confirms that theaccretion physics is mass invariant and that seed IMBHs in the early Universepossibly had powerful jets that were an important source of feedback.

The powerful jet of an off-nuclear intermediate-mass black hole in the spiral galaxy NGC 2276