Vol 14, No 10 (2014) / Shi

A search for double-peaked narrow emission line galaxies and AGNs in the LAMOST DR1

Zhi-Xin Shi, A-Li Luo, Georges Comte, Xiao-Yan Chen, Peng Wei, Yong-Heng Zhao, Fu-Chao Wu, Yan-Xia Zhang, Shi-Yin Shen, Ming Yang, Hong Wu, Xue-Bing Wu, Hao-Tong Zhang, Ya-Juan Lei, Jian-Nan Zhang, Ting-Gui Wang, Ge Jin, Yong Zhang

Abstract

The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) has released more than two million spectra, which provide the opportunity to search for double-peaked narrow emission line (NEL) galaxies and active galactic nuclei (AGNs). The double-peaked narrow-line profiles can be well modeled by two velocity components, respectively blueshifted and redshifted with respect to the systemic recession velocity. This paper presents 20 double-peaked NEL galaxies and AGNs found from LAMOST DR1 using a search method based on a multi-Gaussian fit of the narrow emission lines. Among them, ten have already been published by other authors, either listed as genuine double-peaked NEL objects or as asymmetric NEL objects, and the remaining ten are original discoveries. We discuss some possible origins for the double-peaked narrow-line features, such as interaction between jet and narrow line regions, interaction with companion galaxies, and black hole binaries. Spatially resolved optical imaging and/or follow-up observations in other spectral bands are needed to further discuss the physical mechanisms at work.

Keywords


galaxies: emission lines — quasars: emission lines — methods: data analysis

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DOI: https://doi.org/10.1088/1674-4527/14/10/003

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