| Abstract |
Spectral absorption features due to interstellar ices in the near-infrared (NIR) provide us with information on dust temperature, chemistry, and radiation history of the interstellar medium. Multiple hydrogen recombination lines in the NIR enable us to precisely derive the dust extinction from their intensity ratios. We analyzed the AKARI NIR spectra (2.5-5.0 microns) of nearby 40 galaxies which show the H2O and CO2 ice absorption features as well as multiple hydrogen recombination lines to derive the relation between the ice absorption and dust extinction. Based upon the result, we discuss the interstellar environment with ices in the nearby galaxies. |
