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This paper reports on an XMM-Newton observation of the Seyfert 1 Galaxy Mrk335 performed as a Target of Opportunity when the source was in an unusuallylow flux state. The low level of continuum emission unveiled an underlyingline-rich soft X-ray spectrum, which can be studied with the Reflection GratingSpectrometer. The emission features have been analysed at high resolution withunprecedented detail for this source. Line ratios diagnostic from H-like andHe-like ions indicates that the line emission arises in X-ray photoionisedplasma. Extensive simulations have been performed with the CLOUDYphotoionisation code. From the comparison of the expected and observed lineintensities the physical properties of the line emitting material were derived.Because of the degeneracy in the ionisation parameter, a number of differentsolutions in terms of electron density and column density of the gas areconsistent with the spectral diagnostics. This prevents us from determininguniquely the properties of the plasma; however, the location(s) of the X-rayphotoionised gas can be constrained to be within 0.06 pc (outer boundary). Thislimit places the X-ray line emitting gas at the inner edge of the materialwhere the broad optical lines are produced (Broad Line Region).

The Seyfert 1 Galaxy Mrk 335 at a very low flux state: mapping the soft X-ray photoionised gas