基于模糊识别的重叠星系谱星系对搜索
A Search for Spectral Galaxy Pairs of Overlapping Galaxies based on Fuzzy Recognition
摘要：
光谱星系对（SGPs）是指包含两个独立红移系统的复合星系光谱。这些光谱对于研究前景星系的尘埃性质是有用的。本文从Sloan数字巡天（SDSS）数据Release 9（DR9）中提取了165条SGPs谱线，并利用模糊集理论中的隶属度概念对SGPs谱线进行了模糊识别。分别根据隶属度和图像特征对样品光谱和图像进行分类。这些第二红移系统中的许多太小或太暗，无法单独从SDSS图像中选择，使样本成为低光度或低表面亮度星系中尘埃效应的潜在独特信息来源，这些星系在形态对样本中代表性不足。对于隶属度高的天体，其尘埃消光系数也可用巴耳末衰减量来估计。此外，对来自165个系统的一个SGP的一系列光谱观测的分析表明，我们银河系可能会出现一个新的恒星形成区。
英文摘要：
The Spectral Galaxy Pairs (SGPs) are defined as the composite galaxy spectra which contain two independent redshift systems. These spectra are useful for studying dust properties of the foreground galaxies. In this paper, a total of 165 spectra of SGPs are mined out from Sloan Digital Sky Survey (SDSS) Data Release 9 (DR9) using the concept of membership degree from the fuzzy set theory particularly defined to be suitable for fuzzily identifying emission lines. The spectra and images of this sample are classified according to the membership degree and their image features, respectively. Many of these 2nd redshift systems are too small or too dim to select from the SDSS images alone, making the sample a potentially unique source of information on dust effects in low-luminosity or low-surface-brightness galaxies that are underrepresented in morphological pair samples. The dust extinction of the objects with high membership degree is also estimated by Balmer decrement. Additionally, analyses for a series of spectroscopic observations of one SGP from 165 systems indicate that a newly star-forming region of our Milky Way might occur.
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