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- W2074130117 abstract "We present a key result from our optical integral field spectroscopic survey of 27 nearby ultra luminous and luminous infrared galaxies (U/LIRGs) from the Great Observatory All-sky LIRG Survey. Using spatially resolved multi-component emission line fitting to trace the emission line ratios and velocity dispersion of the ionized gas, we quantify for the first time the widespread shock ionization in gas-rich merging U/LIRGs. Our results show a fractional contribution to the total observed Ha flux from radiative shocks increasing from a few percent during early merger stages to upwards of 60% of the observed optical emission line flux in late stage mergers. We compare our resolved spectroscopy to nuclear spectra and find that 3/4 of the galaxies in our sample that would be classified as composite based on optical spectroscopy are primarily characterized by a combination of star formation and merger-driven shocks. Our results have important implications for the interpretation of composite rest-frame optical spectra of U/LIRGs as starburst+AGN, as the shock emission combined with star formation can mimic composite optical spectra in the absence of any contribution from an AGN." @default.
- W2074130117 created "2016-06-24" @default.
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- W2074130117 date "2014-01-06" @default.
- W2074130117 modified "2023-10-03" @default.
- W2074130117 title "COMPOSITE SPECTRA IN MERGING U/LIRGs CAUSED BY SHOCKS" @default.
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- W2074130117 doi "https://doi.org/10.1088/2041-8205/781/1/l12" @default.
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