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We present new HST ACS medium- and narrow-band images and long-slit, optical(4000 - 7200A) spectra obtained using the Isaac Newton Telescope (INT) on LaPalma, of the merging system Mrk273. The HST observations sample the[OIII]4959,5007 emission from the galaxy and the nearby continuum. The imagesshow that the morphologies of the extended continuum and the ionised gasemission from the galaxy are decoupled, extending almost perpendicular to eachother. In particular, we detect for the first time a spectacular structure ofionised gas in the form of filaments extending ~23 kpc to the east of thenuclear region. The quiescent ionised gas kinematics at these locationssuggests that these filaments are tidal debris left over from a secondarymerger event that are illuminated by an AGN in the nuclear regions. The imagesalso reveal a complex morphology in the nuclear region of the galaxy for boththe continuum and the [OIII] emission. Kinematic disturbance, in the form ofbroad (FWHM > 500 km s-1) and/or strongly shifted (abs(\DeltaV) >150 km s-1)emission line components, is found at almost all locations within a radius of~4 kpc to the east and west of the northern nucleus. We fit the profiles of allthe emission lines of different ionisation with a kinematic model using up to 3Gaussian components. From these fits we derive diagnostic line ratios that areused to investigate the ionisation mechanisms at the different locations in thegalaxy. We show that, in general, the line ratios are consistent withphotoionization by an AGN as the main ionisation mechanism. Finally, thehighest surface brightness [OIII] emission is found in a compact region that iscoincident with the so-called SE nuclear component. The compactness, kinematicsand emission line ratios of this component suggest that it is a separatenucleus with its own AGN.

Extended Warm Gas in the ULIRG Mrk273: Galactic Outflows and Tidal Debris