Haloes around edge-on disc galaxies in the Sloan Digital Sky Survey
Haloes around edge-on disc galaxies in the Sloan Digital Sky Survey
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DOI：
10.1111/j.1365-2966.2004.07235.x
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发表时间：
2004-01
影响因子：
4.8
通讯作者：
S. Zibetti;S. White;J. Brinkmann
中科院分区：
文献类型：
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作者：
S. Zibetti;S. White;J. Brinkmann
我们对斯隆数字巡天(SDSS)拍摄的5个波段的1047个边缘盘状星系的晕辐射进行了统计分析。叠加均匀缩放的星系图像，我们可以测量到深达μr∼31毫微秒−2的表面亮度。这一结果有力地支持了盘状星系周围几乎无处不在的恒星晕的存在，其空间分布由幂定律ρ∝r−3很好地描述，在中等平坦的椭球体(c/a∼0.6)中。G-r和r-i中的颜色估计，虽然不确定，但给出了一个非常红色的恒星种群的明确指示，暗示着年龄较大和/或不可忽视的金属丰度。这些结果支持了通过卫星星系的早期合并来组装光晕的想法。
We present a statistical analysis of halo emission for a sample of 1047 edge-on disc galaxies imaged in five bands by the Sloan Digital Sky Survey (SDSS). Stacking the homogeneously rescaled images of the galaxies, we can measure surface brightnesses as deep as μr∼ 31 mag arcsec−2. The results strongly support the almost ubiquitous presence of stellar haloes around disc galaxies, whose spatial distribution is well described by a power law ρ∝r−3, in a moderately flattened spheroid (c/a∼ 0.6). The colour estimates in g–r and r–i, although uncertain, give a clear indication for extremely red stellar populations, hinting at old ages and/or non-negligible metal enrichment. These results support the idea of haloes being assembled via early merging of satellite galaxies.