Suzaku broad-band observations of the Seyfert 1 galaxies Mrk 509 and Mrk
  841
  We report an analysis and modelling of new Suzaku observations of the Seyfert
1 galaxies Mrk509 and Mrk841, taken between April and November 2006,for
Mrk509,and between January and July 2007,for Mrk841,for a total exposure time
of ~100 ks each.Data from XIS and HXD/PIN instruments,going from 0.5 to 60
keV,represent the highest spectral resolution simultaneous broad-band X-ray
spectrum for these objects.We fitted the broad-band spectrum of both sources
with a double Comptonisation model,adding neutral reflection from distant
material and a two-phase warm absorber.We then studied the two competing models
developed to explain the soft excess in terms of atomic processes:a blurred
ionised disc reflection and an ionised absorption by a high velocity
material.When fitting the data in the 3-10 keV range with a power law
spectrum,and extrapolating this result to low energies,a soft excess is clearly
observed below 2 keV:its strength is however weak compared to previous
observations of both sources.A moderate hard excess is seen at energies greater
than 10 keV,together with a neutral Fe K_a narrow emission line at E~6.4 keV
and a broad Fe emission line.For Mrk509,the broad Fe emission line is required
in all the three physical models in order to have a good fit to the data:this
finding suggests that the blurred reflection model correctly describes the soft
excess,but that it underestimates the broad Fe emission line.For the smeared
absorption model,this suggests instead that the continuum spectrum absorbed by
the outflowing gas should contain indeed a reflected component.For Mrk841,all
three models that we tested provide a good fit to the data,and we cannot
invalidate any of them.A broad emission line is required in the double
Comptonisation and smeared absorption models,while the blurred reflection model
consistently fits the broad-band spectrum,without adding any extra
emission-line component.
