Infrared photometric study of SDSS selected narrow line Seyfert 1 galaxies |
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| Institution: | 1. Lowell Center for Space Science and Technology, 600 Suffolk St, Lowell, MA, 01854, USA;2. Department of Physics and Applied Physics, Olney Science Center, University of Massachusetts Lowell, MA, 01854, USA;1. Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, Kunming 650216, PR China;2. Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, PR China;3. Graduate University of Chinese Academy of Sciences, Beijing, PR China;4. Department of Theoretical Physics and Astrophysics, Masaryk University, Kotlár̆ská 2, Brno 611 37, Czech Republic;1. Department of Applied Mathematics, Faculty of Mathematical Sciences, Ferdowsi University of Mashhad, Mashhad, Iran;2. Department of Mathematics, Faculty of Mathematics, University of Sistan and Baluchestan, Zahedan, Iran |
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| Abstract: | The infrared photometric study of SDSS selected Narrow Line Seyfert 1 Galaxies (NLS1s) is presented in this paper. We have made cross-identifications for such NLS1s with 2MASS and WISE observations. Finally 992 NLS1s have 2MASS and WISE counterparts. Comparisons of NLS1s with the Broad Line Seyfert 1 (BLS1s) and Seyfert 2 galaxies are made. It is shown that from 1 µm to 5 µm NLS1s are redder than BLS1s and Seyfert 2 galaxies possibly due to the richer dust environment in NLS1 nuclei or to the orientation effect while in the longer wavelengths those three kinds of sources have quite similar behavior indicative of radiation mainly from the similar warm starburst-related dust and the related AGN dust.In addition, relations between infrared colors and related (to Hβ) strengths of some important lines are also investigated. The results show that the related strengths of FeII] 4570 Å are positively correlated with infrared colors in the 1–5 µm region, but negatively correlated with infrared colors in the 12–22 µm region; the related strength of OIII] 5007 Å are negatively correlated with infrared colors in the 1–5 µm region, but positively correlated with infrared colors in the 12–22 µm region; the related strength of NII]6583 Å are also negatively correlated with infrared colors in the 1–5 µm region, but positively correlated with infrared colors in the 12–22 µm region. Therefore it is indicated that the behavior of FeII] 4570 Å is just opposed to that for OIII] 5007 Å and NII] 6583 Å This result may be caused by different origins of such lines. |
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