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A systematic analysis of the X-ray emission from the nearby ultraluminousinfrared galaxy Mrk 273 was carried out by combining new 200 ksec Chandra datawith archived 44 ksec data. The active galactic nucleus (AGN) associated withthe Southwest nucleus is confirmed by the new data, and a secondary hard X-ray(4-8 keV) point source is detected, coincident with the Northeast nucleus at aprojected distance of 0.75 kpc from the Southwest nucleus. The hard X-rayspectrum of the Northeast nucleus is consistent with a heavily absorbed AGN,making Mrk 273 another example of a dual AGN in a nearby galaxy merger.Significant 1-3 keV emission is found along the ionization cones and outflowinggas detected in a previous study. The data also map the giant X-ray nebulasouth of the host galaxy with unprecedented detail. This nebula extends on ascale of $\sim$ 40 kpc $\times$ 40 kpc, and is not closely related to thewell-known tidal tail seen in the optical. The X-ray emission of the nebula isbest described by a single-temperature gas model, with a temperature of $\sim$7 million K and a super-solar $\alpha$/Fe ratio. Further analysis suggests thatthe southern nebula has most likely been heated and enriched by multiplegalactic outflows generated by the AGN and/or circumnuclear starburst in thepast, on a time scale of $\lesssim$0.1 Gyr, similar to the merger event itself.

Elliptical Galaxy in the Making: The Dual Active Galactic Nuclei and Metal-enriched Halo of Mrk 273