DOUBLE-PEAKED NARROW EMISSION-LINE GALAXIES FROM THE SLOAN DIGITAL SKY SURVEY. I. SAMPLE AND BASIC PROPERTIES
DOUBLE-PEAKED NARROW EMISSION-LINE GALAXIES FROM THE SLOAN DIGITAL SKY SURVEY. I. SAMPLE AND BASIC PROPERTIES
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DOI：
10.1088/0067-0049/201/2/31
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发表时间：
2012-08
期刊：
影响因子：
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通讯作者：
J. Ge;Chen Hu;Jian-Min Wang;J. Bai;Shu Zhang
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文献类型：
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作者：
J. Ge;Chen Hu;Jian-Min Wang;J. Bai;Shu Zhang
近年来，双峰窄发射线（NEL）星系受到了广泛的关注，其中一些被认为与合并星系有关。我们进行了系统的搜索，以建立最大的样本，这些来源的数据发布7斯隆数字巡天（SDSS）。通过合理的通量、发射线的半高宽和峰的间距标准，我们选取了3030个双峰NEL星系。根据Baldwin-Phillips-Terlevich图中宽巴耳末线的存在和双峰NEL两个分量的位置，我们发现有81个Ⅰ型活动星系核，837个双Ⅱ型活动星系核708个星系具有双恒星形成成分（2-SF），400个星系具有混合恒星形成和II型AGN成分（II型+ SF），以及1004个未知类型的物体。作为一个副产品，一个样本的星系（12,582）与不对称或顶部平坦的轮廓的发射线建立。通过对这两个样本的SDSS图像进行目视检查，我们发现有54个星系具有双核。目前的样品可用于研究合并星系的动力学，黑洞活动的触发机制，星系的分级增长，以及由外流和旋转盘驱动的窄线区域的动力学。
Recently, much attention has been paid to double-peaked narrow emission-line (NEL) galaxies, some of which are suggested to be related to merging galaxies. We make a systematic search to build the largest sample of these sources from Data Release 7 of the Sloan Digital Sky Survey (SDSS). With reasonable criteria for fluxes, FWHMs of the emission lines, and separations of the peaks, we select 3030 double-peaked NEL galaxies. In light of the existence of broad Balmer lines and the locations of the two components of double-peaked NELs distinguished by the Kauffmann et al. criteria in the Baldwin–Phillips–Terlevich diagram, we find that there are 81 Type I active galactic nuclei (AGNs), 837 double Type II AGNs (2-Type II), 708 galaxies with double star-forming components (2-SF), 400 with mixed star-forming and Type II AGN components (Type II + SF), and 1004 unknown-type objects. As a by-product, a sample of galaxies (12,582) with asymmetric or top-flat profiles of emission lines is established. After visually inspecting the SDSS images of the two samples, we find 54 galaxies with dual cores. The present samples can be used to study the dynamics of merging galaxies, the triggering mechanism of black hole activity, the hierarchical growth of galaxies, and the dynamics of narrow line regions driven by outflows and a rotating disk.