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We report on a detailed study of the stellar populations and ionized gasproperties in the merger LIRG NGC 2623, analysing optical Integral FieldSpectroscopy from the CALIFA survey and PMAS LArr, multiwavelength HST imaging,and OSIRIS narrow band H$\alpha$ and [NII]$\lambda$6584 imaging. The spectrawere processed with the STARLIGHT full spectral fitting code, and the resultscompared with those for two early-stage merger LIRGs (IC 1623 W and NGC 6090),together with CALIFA Sbc/Sc galaxies. We find that NGC 2623 went through twoperiods of increased star formation (SF), a first and widespread episode,traced by intermediate-age stellar populations ISP (140 Myr-1.4 Gyr), and asecond one, traced by young stellar populations YSP ($<$140 Myr), which isconcentrated in the central regions ($<$1.4 kpc). Our results are in agreementwith the epochs of the first peri-center passage ($\sim$200 Myr ago) andcoalescence ($<$100 Myr ago) predicted by dynamical models, and with highresolution merger simulations in the literature, consistent with NGC 2623representing an evolved version of the early-stage mergers. Most ionized gas isconcentrated within $<$2.8 kpc, where LINER-like ionization and high velocitydispersion ($\sim$220 km/s) are found, consistent with the previously reportedoutflow. As revealed by the highest resolution OSIRIS and HST data, acollection of HII regions is also present in the plane of the galaxy, whichexplains the mixture of ionization mechanisms in this system. It is unlikelythat the outflow in NGC 2623 will escape from the galaxy, given the low SFRintensity ($\sim$0.5 M$_{\odot}$yr$^{-1}$kpc$^{-2}$), the fact that the outflowrate is 3 times lower than the current SFR, and the escape velocity in thecentral areas higher than the outflow velocity.

The spatially resolved stellar population and ionized gas properties in the merger LIRG NGC 2623