Evidence of galaxy interaction in the Narrow-line Seyfert 1 galaxy
  IRAS17020+4544 seen by NOEMA
  The narrow-line Seyfert 1 galaxy IRAS17020+4544 is one of the few sources
where both an X-ray ultra-fast outflow and a molecular outflow were observed to
be consistent with energy conservation. However, IRAS17020+4544 is less massive
and has a much more modest active galactic nucleus (AGN) luminosity than the
other examples. Using recent CO(1-0) observations with the NOrthern Extended
Millimeter Array (NOEMA), we characterised the molecular gas content of the
host galaxy for the first time. We found that the molecular gas is distributed
into an apparent central disc of 1.1x10^9 Msun, and a northern extension
located up to 8 kpc from the centre with a molecular gas mass M_H2~10^8 Msun.
The molecular gas mass and the CO dynamics in the northern extension reveal
that IRAS 17020+4544 is not a standard spiral galaxy, instead it is interacting
with a dwarf object corresponding to the northern extension. This interaction
possibly triggers the high accretion rate onto the super massive black hole.
Within the main galaxy, which hosts the AGN, a simple analytical model predicts
that the molecular gas may lie in a ring, with less molecular gas in the
nuclear region. Such distribution may be the result of the AGN activity which
removes or photodissociates the molecular gas in the nuclear region (AGN
feedback). Finally, we have detected a molecular outflow of mass
M_H2=(0.7-1.2)x10^7 Msun in projection at the location of the northern galaxy,
with a similar velocity to that of the massive outflow reported in previous
millimeter data obtained by the Large Millimeter Telescope.
