Insights into the evolution of five isolated galaxies
  The galaxy evolution is believed to be conditioned by the environment.
Isolated galaxies or galaxies in poor groups are an excellent laboratory to
study evolutionary mechanisms where effects of the environment are minimal. We
present new {\it Swift}-{\tt UVOT} data in six filters, three in the
ultraviolet (UV), of five isolated galaxies aiming at shedding light into their
evolution. For all of our targets we present new UV integrated fluxes and for
some of them also new UBV magnitudes. Our observations allow us to improve
their multi-wavelength spectral energy distributions extending it over about 3
orders of magnitude in wavelength. We exploit our smooth-particle
hydro-dynamical simulations with chemo-photometric implementation anchored, a
posteriori, to the global multi-wavelength properties of our targets, to give
insight into their evolution. Then we compare their evolutionary properties
with those previously derived for several galaxies in groups. The evolution of
our targets is driven by a merger occurred several Gyrs ago, in the redshift
range $0.5\leq z \leq 4.5$, not unlike what we have already found for galaxies
in groups. The merger shapes the potential well where the gas is accreting
driving the star formation rate and the galaxy evolution. Isolated galaxies
should not have suffered from interactions for at least 3\,Gyr. However, the
initial merger is still leaving its signatures on the properties of our
targets. Several rejuvenation episodes, triggered by {\it in situ} accretion,
are highlighted. Moreover, jelly-fish morphologies appear as these galaxies
achieve their maximum star formation rate, before their quenching phase.
