期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 397, 期 4, 页码 1966-1975出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2009.15038.x
关键词
galaxies: active; galaxies: elliptical and lenticular; cD; galaxies: nuclei; infrared: galaxies
资金
- Program for New Century Excellent Talents in University (NCET)
- national Natural Science Foundation of China [10878010, 10633040]
- National Basic Research Program (973 Program) [2007CB815405]
- Jet Propulsion Laboratory, California Institute of Technology
- National Aeronautics and Space Administration
- NASA [1407]
We present the Spitzer Space Telescope Infrared Array Camera observations for a sample of local elliptical galaxies to study later stages of active galactic nucleus (AGN) activity. A sample of 36 elliptical galaxies is selected from the Palomar spectroscopic survey. We detect nuclear non-stellar infrared emission in nine of them. There is unambiguous evidence of circumnuclear dust in these nine 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 to nuclear activity. The possible origin of infrared excess emission from hot dust heated by the central AGN is supported by the spectral indices of the infrared excess emission.
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