Galaxy And Mass Assembly (GAMA): the input catalogue and star-galaxy separation
Galaxy And Mass Assembly (GAMA): the input catalogue and star-galaxy separation
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星系和质量组装（GAMA）：输入目录和星星系分离
DOI：
10.1111/j.1365-2966.2010.16282.x
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发表时间：
2010
影响因子：
4.8
通讯作者：
Baldry I
中科院分区：
文献类型：
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作者：
Baldry I
我们描述了星系和质量组装(GAMA)调查的光谱目标选择。输入星表来自斯隆数字巡天(SDSS)和UKIRT红外深空巡天(UKIDSS)。最初的目标是测量天赤道上三个4°×12°区域中星系在9、12和14.5h的红移，三个区域的星等选择sr<；19.4、z<；18.2和kAB<；17.6，12-h区域的星等选择19.8。靶密度在12-h区域为1080°−2，在其他区域为720°−2。GAMA的平均目标密度和面积与已完成和正在进行的星系红移调查进行了比较。GAMA调查实现了高度完整的恒星-星系分离，它联合使用了强度剖面分隔器(根据SDSS，Δsg=rpsf−rmodas)和颜色分隔器。色分器定义为Δsg，jk=J−K−f(g−i)，其中F(g−i)与恒星轨迹的J−K颜色在0.3和lt；g−i和lt；2.3范围内是二次拟合。所研究的所有星系群都用Δsg，jk>；0.2.2很好地分开。在英国-澳大利亚望远镜上一个为期三年的AAOmega计划的两年中，我们已经获得了79,599个独特的星系红移。此前已知的GAMA地区红移使总数达到98497个。星系红移中值为0.2，其中99%为atz<；0.5。我们给出了这次调查的一些全球统计性质，包括K带星系计数、颜色-红移关系和初步的n(Z)。
We describe the spectroscopic target selection for the Galaxy And Mass Assembly (GAMA) survey. The input catalogue is drawn from the Sloan Digital Sky Survey (SDSS) and UKIRT Infrared Deep Sky Survey (UKIDSS). The initial aim is to measure redshifts for galaxies in three 4°× 12° regions at 9, 12 and 14.5 h, on the celestial equator, with magnitude selectionsr< 19.4,z< 18.2 andKAB< 17.6 over all three regions, andr< 19.8 in the 12-h region. The target density is 1080 deg−2in the 12-h region and 720 deg−2in the other regions. The average GAMA target density and area are compared with completed and ongoing galaxy redshift surveys. The GAMA survey implements a highly complete star–galaxy separation that jointly uses an intensity-profile separator (Δsg=rpsf−rmodelas per the SDSS) and a colour separator. The colour separator is defined as Δsg,jk=J−K−f(g−i), wheref(g−i) is a quadratic fit to theJ−Kcolour of the stellar locus over the range 0.3 <g−i< 2.3. All galaxy populations investigated are well separated with Δsg,jk> 0.2. From 2 yr out of a 3-yr AAOmega program on the Anglo-Australian Telescope, we have obtained 79 599 unique galaxy redshifts. Previously known redshifts in the GAMA region bring the total up to 98 497. The median galaxy redshift is 0.2 with 99 per cent atz< 0.5. We present some of the global statistical properties of the survey, includingK-band galaxy counts, colour–redshift relations and preliminaryn(z).