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Paper: Observations of Nearby Elliptical Galaxies with Spitzer/IRS and MIPS
Volume: 381, The Second Annual Spitzer Science Center Conference: Infrared Diagnostics of Galaxy Evolution
Page: 165
Authors: Kaneda, H.; Onaka, T.; Sakon, I.
Abstract: We report on mid- and far-IR Spitzer observations of nearby dusty X-ray-emitting elliptical galaxies by using the MIPS and IRS. The elliptical galaxies were all detected at the MIPS 24 μm, 70 μm, and 160 μm bands. The SEDs show prominent mid-IR excess above thermal continua, which indicates the presence of relatively abundant small-size grains. We detected the PAH emission features. The observed spectra seem to be quite unusual; the PAH features at 6.2, 7.7, and 8.6 μm are very faint or even absent in contrast to prominent emission features at 11.3 and/or 12.7 μm, which may reflect peculiar physical conditions of the ISM.
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