Low surface brightness galaxies selected from the 40% sky area of the ALFALFA HI survey I. Sample and statistical properties
Low surface brightness galaxies selected from the 40% sky area of the ALFALFA HI survey I. Sample and statistical properties
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低%20表面%20亮度%20星系%20从%20%2040%%20sky%20面积%20的%20%20ALFALFA%20HI%20调查%20I.%20样本%20和%20统计%20属性中选择%20
DOI：
10.1088/0004-6256/149/6/199
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发表时间：
2015
影响因子：
5.3
通讯作者：
Wei Du
中科院分区：
文献类型：
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作者：
Wei Du
低表面亮度（LSB）星系是中心表面亮度至少比夜空暗一个星等的天体，它们的数量对于理解星系形成和宇宙演化的极端情况至关重要。由于LSB星系大多富含气体（H i），α。40斯隆数字巡天（SDSS）数据发布7（DR7）样本是在本地宇宙中选择样本的最佳巡天组合之一。由于SDSS测光管道系统地高估了星系图像的天空背景，特别是对于明亮星系或具有扩展LSB外围的星系，本文首先在α中每个星系的g和r波段上精确地估计了SDSS图像的天空背景。40 SDSS DR7样本，使用精确的天空相减方法。减去天空背景后，我们使用SExtractor软件使用Kron椭圆孔径进行表面测光，并使用Galfit软件为α中的每个星系图像拟合指数轮廓模型的几何参数。40份SDSS DR7样品。在光度和几何计算结果的基础上，进一步计算了B波段中心面亮度，
The population of low surface brightness (LSB) galaxies, which are objects with central surface brightnesses at least one magnitude fainter than the night sky, is crucial for understanding the extremes of galactic formation and evolution of the universe. As LSB galaxies are mostly rich in gas (H i), the α. 40 Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7) sample is one of the best survey combinations to select a sample of them in the local universe. Since the sky backgrounds are systematically overestimated for galactic images by the SDSS photometric pipeline, particularly for luminous galaxies or galaxies with extended LSB outskirts, in this paper, we above all estimated the sky backgrounds of SDSS images accurately in both the g and r bands for each galaxy in the α. 40 SDSS DR7 sample, using a precise method of sky subtraction. Once subtracting the sky background, we did surface photometry with the Kron elliptical aperture using the SExtractor software and fitted geometric parameters with an exponential profile model using the Galfit software for each galactic image in the α. 40 SDSS DR7 sample. Based on the photometric and geometric results, we further calculated the B-band central surface brightness,