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arXiv 0704.0192astro-ph
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大下表面亮度星系中的恒星形成

Star Formation in Galaxies with Large Lower Surface Brightness Disks

K. O'Neil, S. Oey, G. Bothun

摘要:

我们目前的B,R,和Halpha成像数据的19个大型盘星系的性质是经典的低表面亮度星系和普通的高表面亮度星系之间的中间。我们使用洛厄尔1.8米帕金斯望远镜的数据来确定星系的整体形态,颜色和恒星形成特性。形态上,星系范围从Sb到Irr,包括有核和无核棒的星系。星系的颜色从B-R = 0.3 - 1.9不等,大多数星系的颜色随着半径的增加而呈现出轻微的蓝色。这些星系的Halpha图像显示,它们的平均恒星形成率低于具有较高表面亮度盘的类似样本。此外,所研究的星系具有更高的气体质量与光度比和扩散的Halpha发射,比在更高的表面亮度样本中发现的更高。

英文摘要:

We present B, R, and Halpha imaging data of 19 large disk galaxies whose properties are intermediate between classical low surface brightness galaxies and ordinary high surface brightness galaxies. We use data taken from the Lowell 1.8m Perkins telescope to determine the galaxies' overall morphology, color, and star formation properties. Morphologically, the galaxies range from Sb through Irr and include galaxies with and without nuclear bars. The colors of the galaxies vary from B-R = 0.3 - 1.9, and most show at least a slight bluing of the colors with increasing radius. The Halpha images of these galaxies show an average star formation rate lower than is found for similar samples with higher surface brightness disks. Additionally, the galaxies studied have both higher gas mass-to-luminosity and diffuse Halpha emission than is found in higher surface brightness samples.

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