S22A0064
S22A0064
Luminous (LIR>1011L⊙) and Ultraluminous (LIR>1012L⊙) Infrared Galaxies (LIRGs and ULIRGs) are known to be starburst galaxies triggered by galaxy interactions/mergers in the local universe. ULIRGs are those in peak phases of the starbursts, whilst the “LIRG” phase would include all the rest of the merger sequence. Understanding the mechanisms responsible for the “quenching” of the star formation in galaxies is of great importance, but the traditional “LIRG” selection based solely on the IR luminosity would pick up galaxies in both “rising” and “declining” phases of their starburst activity. The goal of this proposal is to carry out SWIMS NIR spectroscopy of 20 LIRGs (at z=0.06–0.09; 10 mergers and 10 non-mergers), and derive their line ratio between helium recombination HeI 1.869µm and Paα 1.875µm (HeI1.87µm/Paα) to identify the “quenching LIRGs” —i.e. those immediately (<5 Myr) after the quenching mechanism is switched on. The simultaneous wavelength coverage of SWIMS at 0.9–2.5µm will also allow us to investigate the nature of “quenching LIRGs” with the NIR tracers of shock and AGN, with which we can unveil the physical conditions of LIRGs under the very early quenching phase.
This document was translated from LATEX by HEVEA.