The Seyfert 1 galaxy ( catalog Ark~564 ) was observed with Chandra high energy transmission gratings for 250 ks .
We present the high resolution X-ray spectrum that shows several associated absorption lines .
The photoionization model requires two warm absorbers with two different ionization states ( logU = 0.39 \pm 0.03 and logU = -0.99 \pm 0.13 ) , both with moderate outflow velocities ( \sim 100 km s ^ { -1 } ) and relatively low line of sight column densities ( logN _ { H } = 20.94 and 20.11 cm ^ { -2 } ) .
The high ionization phase produces absorption lines of O vii , O viii , Ne ix , Ne x , Mg xi , Fe xvii and Fe xviii while the low ionization phase produces lines at lower energies ( O vi & O vii ) .
The pressure–temperature equilibrium curve for the ( catalog Ark~564 ) absorber does not have the typical “ S ” shape , even if the metallicity is super-solar ; as a result the two warm-absorber phases do not appear to be in pressure balance .
This suggests that the continuum incident on the absorbing gas is perhaps different from the observed continuum .
We also estimated the mass outflow rate and the associated kinetic energy and find it to be at most 0.009 \% of the bolometric luminosity of ( catalog Ark~564 ) .
Thus it is highly unlikely that these outflows provide significant feedback required by the galaxy formation models .