2Mass Observation Of Infrared Quasars |
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Authors: | Pei-sheng Chen Hong-guang Shan Pin Zhang Yi-fei Gao |
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Institution: | (1) National Astronomical Observatories/Yunnan Observatory and Graduate School, Chinese Academy of Sciences, Kunming, 650011, China;(2) Cosmic Ray Institute, Yunnan University, Kunming, 650091, China |
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Abstract: | The 2MASS observation of the infrared quasars (IR QSOs) known so far is presented in this paper. Compared with the optical
selected quasars, infrared quasars are more dust-enshrouded and have redder colors and steeper spectral indices in the near
infrared. In consequence, they are much younger than the optical selected quasars. The result may be helpful to the suggestion
that the evolution links could be the ULIRGs - > the IR QSOs - > the optical selected quasars.
This publication makes use of data products from the Two Micron All Sky Survey (2MASS), which is a joint project of the University
of Massachusetts and the Infrared Processing and Analysis Center, funded by the National Aeronautics and Space Administration
and the National Science Foundation of the United States. |
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Keywords: | galaxy: AGN quasar infrared |
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