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Infrared-red Cores in Nearby Elliptical Galaxies

We present the Spitzer Space Telescope Infrared Array Camera (IRAC) observations for a sample of local elliptical galaxies to study later stages of AGN activities. A sample of 36 elliptical galaxies is selected from the Palomar spectroscopic survey. We detect nuclear non-stellar infrared emission in 9 of them. There is unambiguous evidence of circumnuclear dust in these 9 galaxies in their optical images. We also find a remarkable correlation between the infrared excess emission and the nuclear radio/X-ray emission, suggesting that infrared excess emission is tightly related with nuclear activity. Possible origin of infrared excess emission from hot dust heated by the central AGN is supported by spectral indices of IR excess emission.

preprint2009arXivOpen access
Y. -P TangQ. -S. GuJ. -S. HuangY. -P. Wang
astro-ph.CO
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Open access4 authors1 topic
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Y. -P TangQ. -S. GuJ. -S. HuangY. -P. Wang

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