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Analysis of data from the Chandra X-ray Observatory for the double nucleusULIRG Mrk 273 reveals an absorbed hard X-ray source coincident with thesouthwest nucleus, implying that this unresolved near infrared source is wherean active nucleus resides while the northern nuclear region contains a powerfulstarburst which dominates the far infrared luminosity. There is evidence of aslight image extension in the 6-7 keV band, where a Fe K line is present,towards the northern nucleus. A large-scale, diffuse emission nebula detectedin soft X-rays contains a dark lane that spatially coincides with a highsurface-brightness tidal tail extending ~50 arcsec (40 kpc) to the south. Thesoft X-ray source is likely located behind the tidal tail which absorbs X-rayphotons along the line of sight. The estimated column density of cold gas inthe tidal tail responsible for shadowing the soft X-rays is nH >= 6e+21 cm-2,consistent with the tidal tail having an edge-on orientation.

The location of an active nucleus and the soft X-ray shadowing by a tidal tail in the ULIRG Mrk 273