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We present the discovery of an outflowing ionized wind in the Seyfert 1Galaxy Mrk 335. Despite having been extensively observed by most of the largestX-ray observatories in the last decade, this bright source was not known tohost warm absorber gas until recent XMM-Newton observations in combination witha long-term Swift monitoring program have shown extreme flux and spectralvariability. High resolution spectra obtained by the XMM-Newton RGS detectorreveal that the wind consists of three distinct ionization components, alloutflowing at a velocity of 5000 km/s. This wind is clearly revealed when thesource is observed at an intermediate flux state (2-5e-12 ergs cm^-2 s^-1). Theanalysis of multi-epoch RGS spectra allowed us to compare the absorberproperties at three very different flux states of the source. No correlationbetween the warm absorber variability and the X-ray flux has been determined.The two higher ionization components of the gas may be consistent withphotoionization equilibrium, but we can exclude this for the only ionizationcomponent that is consistently present in all flux states (log(xi)~1.8). Wehave included archival, non-simultaneous UV data from HST (FOS, STIS, COS) withthe aim of searching for any signature of absorption in this source that so farwas known for being absorption-free in the UV band. In the COS spectra obtaineda few months after the X-ray observations we found broad absorption in CIVlines intrinsic to the AGN and blueshifted by a velocity roughly comparable tothe X-ray outflow. The global behavior of the gas in both bands can beexplained by variation of the covering factor and/or column density, possiblydue to transverse motion of absorbing clouds moving out of the line of sight atBroad Line Region scale.

The rise of an ionized wind in the Narrow Line Seyfert 1 Galaxy Mrk 335 observed by XMM-Newton and HST