Structure and star formation in disk galaxies - II. Optical imaging
Structure and star formation in disk galaxies - II. Optical imaging
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DOI：
10.1051/0004-6361:20041584
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发表时间：
2004-08
影响因子：
6.5
通讯作者：
J. Knapen;S. Stedman;D. Bramich;S. Folkes;T. R. B. U. O. Hertfordshire;U. S. Andrews
中科院分区：
文献类型：
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作者：
J. Knapen;S. Stedman;D. Bramich;S. Folkes;T. R. B. U. O. Hertfordshire;U. S. Andrews
我们展示了对 57 个螺旋星系样本的光学观测结果，并描述了减少数据所遵循的程序。我们已经获得了光学 B 和 I 宽带以及 Hα 中的图像，具有中等空间分辨率和足够宽的视场，可以对整个星系盘进行成像。此外，我们在 R 波段观测了 55 个样本星系，在 V 波段观测了 8 个样本星系，并通过 Hα 线专用的窄连续谱滤波器对一个子集进行了成像。我们描述了我们在这项工作过程中开发的数据缩减程序，用于注册、组合和光度校准单个星系的每组图像。我们详细描述了从 Hα 图像中减去连续发射的过程。在配套论文中，我们描述了星系样本的近红外成像，并对样本星系中的盘尺度长度以及条、环和 H 区域的特性进行了分析。此处描述的图像可供其他研究人员使用。
We present optical observations of a sample of 57 spiral galaxies and describe the procedures followed to reduce the data. We have obtained images in the optical B and I broad bands, as well as in Hα, with moderate spatial resolution and across wide enough fields to image the complete disks of the galaxies. In addition, we observed 55 of our sample galaxies in the R and eight in the V band, and imaged a subset through a dedicated narrow continuum filter for the Hα line. We describe the data reduction procedures we developed in the course of this work to register, combine and photometrically calibrate each set of images for an individual galaxy. We describe in some detail the procedure used to subtract the continuum emission from our Hα images. In companion papers, we describe near-infrared imaging of the galaxy sample, and present analyses of disk scale lengths, and of properties of bars, rings, and H regions in the sample galaxies. The images described here are available for use by other researchers.