A jet-dominated model for a broad-band spectral energy distribution of
  the nearby low-luminosity active galactic nucleus in M94
  We have compiled a new multiwavelength spectral energy distribution (SED) for
the closest obscured low-ionization emission-line region active galactic
nucleus (AGN), NGC 4736, also known as M94. The SED comprises mainly
high-resolution (mostly sub-arcsecond, or, at the distance to M94, <23 pc from
the nucleus) observations from the literature, archival data, as well as
previously unpublished sub-millimetre data from the Plateau de Bure
Interferometer (PdBI) and the Combined Array for Research in Millimeter-wave
Astronomy, in conjunction with new electronic MultiElement Radio
Interferometric Network (e-MERLIN) L-band (1.5 GHz) observations. Thanks to the
e-MERLIN resolution and sensitivity, we resolve for the first time a double
structure composed of two radio sources separated by ~1 arcsec, previously
observed only at higher frequency. We explore this data set, which further
includes non-simultaneous data from the Very Large Array, the Gemini telescope,
the Hubble Space Telescope and the Chandra X-ray observatory, in terms of an
outflow-dominated model. We compare our results with previous trends found for
other AGN using the same model (NGC 4051, M81*, M87 and Sgr A*), as well as
hard- and quiescent-state X-ray binaries. We find that the nuclear broad-band
spectrum of M94 is consistent with a relativistic outflow of low inclination.
The findings in this work add to the growing body of evidence that the physics
of weakly accreting black holes scales with mass in a rather straightforward
fashion.
