Small-scale excesses in the infrared continuum radiation of active galactic nuclei

Abstract

Small-scale excesses in the infrared band observed in the continuum radiation from active galactic nuclei are explained in light of the morphological transformations of ice, which constitutes part of dust grains' outer mantles. Following laboratory simulation results, a double-peaked bump should be observed in the 18-23 microns wave band with a flux intensity ratio of about 3 between the one at the highest wavelength and that at the lowest. However, only the most prominent one could actually be detected. It is suggested that they are produced in the shocked clouds of the narrow-line region of active galactic nuclei. 28 refs.