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Results of observations with the Spitzer, Hubble, GALEX, Chandra, andXMM-Newton space telescopes are presented for the Luminous Infrared Galaxy(LIRG) merger Mrk 266. The SW (Seyfert 2) and NE (LINER) nuclei reside ingalaxies with Hubble types SBb (pec) and S0/a (pec), respectively. Bothgalaxies have L > L*, and they are inferred to each contain a ~2.5x10^8 M_sunblack hole. Mrk 266 SW is likely the primary source of a bright Fe K-alpha linedetected from the system, consistent with the reflection-dominated X-rayspectrum of a heavily obscured AGN. Optical knots embedded in an arc withaligned radio continuum radiation, combined with luminous H_2 line emission,provide evidence for a radiative bow shock in an AGN-driven outflow surroundingthe NE nucleus. Soft X-ray emission modeled as shock-heated plasma isco-spatial with radio continuum emission between the galaxies. Mid-IRdiagnostics indicate roughly equal contributions of AGN and starburst radiationpowering the bolometric luminosity. Approximately 120 star clusters have beendetected, with most having estimated ages < 50 Myr. Detection of 24 micronemission extending ~34 arcsec (20 kpc) north of the galaxies is interpreted as~2x10^7 M_sun of dust entrained in an outflowing superwind; at opticalwavelengths this region is resolved into a fragmented morphology indicative ofRayleigh-Taylor instabilities in an expanding shell of ionized gas. Mrk 266demonstrates that the dust "blow-out" phase can begin in a LIRG well before thegalaxies fully coalesce during a subsequent ULIRG phase, and rapid gasconsumption in luminous dual AGNs (kpc scale separations) early in the mergerprocess may explain the paucity of detected binary QSOs (sub-pc scale orbits)in large surveys. An evolutionary sequence is proposed representing aprogression from dual to binary AGNs, accompanied by an increase in observedL_x/L_ir ratios by 10^4 or more.

Investigation of Dual Active Nuclei, Outflows, Shock-Heated Gas, and Young Star Clusters in Markarian 266