Landing page for project EY039

The dwarf galaxy NGC 4395 at z = 0.00106 (~4 Mpc, 1 mas ~0.02 pc) has been known to host an intermediate-mass black hole (IMBH). The recent optical reverberation observations by Woo et al. (2019) show that the IMBH has a much lower (~30x) mass, only about 10,000 solar mass. As one of the lightest IMBHs, it plays a key role in studying various black hole scalling relations. In the early deep VLBI observations at 1.4 GHz, it powers a sub-mJy outflow on sub-pc scales. Based on the non-simultaneous e-MERLIN and VLA observations in literature, we notice that it shows a relatively flat spectrum with a flux density of 0.8 mJy at <=8.4 GHz. To further classify the outflow as a faint jet including a flat-spectrum radio core on centi-pc scales, we propose 6-hour e-EVN observations at 5 GHz. The finding of the jet base would provide the direct evidence for a stable accretion-ejection system associated with the smallest AGN.

This data is part of the archive of VLBI data maintained by JIVE on behalf of the EVN, a network of radio telescopes located primarily in Europe and Asia, with additional antennas in South Africa. The EVN archive itself has the DOI https://doi.org/10.17616/R3Z197