Abstract
We present T-ReCS high spatial resolution N-band (8-13μm) spectroscopy of the central regions (a few kpc) of 3 local LIRGs. The nuclear spectra show deep 9.7μm silicate absorption feature and the high ionization [S IV]10.5μ m emission line, consistent with their optical classification as AGN. The two LIRGs with unresolved mid-IR emission do not show PAH emission at 11.3μm in their nuclear spectra. The spatially resolved mid-IR spectroscopy of NGC 5135 allows us to separate out the spectra of the Seyfert nucleus, an H II, and the diffuse region between them on scales of less than 2.5 arcsec∼ 600 pc. The diffuse region spectrum is characterized by strong PAH emission with almost no continuum, whereas the H II region shows PAH emission with a smaller equivalent width as well as [Ne II]12.8μm line.
