首页|Stellar Populations of AGN-host Dwarf Galaxies Selected with Different Methods
Stellar Populations of AGN-host Dwarf Galaxies Selected with Different Methods
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In this paper we investigate the stellar populations and star formation histories of 235 active galactic nucleus(AGN)-host dwarf galaxies,consisting of four samples identified separately with different methods(i.e.,radio,X-ray,mid-IR and variability),utilizing the synthesis code STARLIGHT and spectra from the Sloan Digital Sky Survey Data Release 8.Our results show that the variability sample is the oldest,while the mid-IR sample is the youngest,for which the luminosity at 4020 Å is dominated(＞50％)by the young population(t＜108 yr).The light-weighted mean stellar age of the whole sample is in general about 0.7 dex younger than the optical sample studied in Cai et al.We compare the population results between fitting models with and without a power-law(PL)component and find that the neglect of a PL component would lead to an under-and over-estimation by 0.2 and 0.1 dex for the light-and mass-weighted mean stellar age,respectively,for our sample of dwarf galaxies,which has a mean fractional contribution of～16％from the AGN.In addition,we obtain further evidence for a possible suppression of star formation in the host galaxy by the central AGN.We also find that there exists an anti-correlation between the extinction-corrected[O m]luminosity and light-weighted mean stellar age,confirming our previous finding that there is a physical connection between AGN and star-forming activities in AGN-host dwarfs.
Yunnan Observatories,Chinese Academy of Sciences,Kunming 650216,China
University of Chinese Academy of Sciences,Beijing 100049,China
Key Laboratory of Radio Astronomy and Technology,Chinese Academy of Sciences,Beijing 100101,China
Key Laboratory for the Structure and Evolution of Celestial Objects,Chinese Academy of Sciences,Kunming 650011,China
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China Manned Space ProjectNational Key R&D Program of ChinaNational Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)U.S.Department of Energy Office of Science
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