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arXiv 0908.4091astro-ph.CO
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M81中的候选星团

Star Cluster Candidates in M81

J. B. Nantais, J. P. Huchra, B. McLeod, J. Strader, J. P. Brodie

摘要:

我们提出了一个目录的扩展对象在附近的M81的基础上,一组24哈勃空间望远镜先进的巡天相机(ACS)宽视场相机(WFC)F814 W(I波段)的图像。我们已经发现了233个好的球状星团候选者; 92个候选的HII区,OB协会,或弥漫疏散星团; 489个可能的背景星系;和1719个未分类的对象。我们有彩色数据从地面的g-和r-波段MMT Megacam图像的79个星系,125个球状星团候选人,7个HII地区,和184个未分类的对象。球状星团候选者的色图显示,大多数落在0.25 < g-r < 1.25和0.5 < r-I < 1.25的范围内,与银河系球状星团的颜色范围相似。未分类的天体通常是蓝色的,这表明它们中的许多可能是HII区和疏散星团,尽管少数星系和球状星团可能在其中。

英文摘要:

We present a catalog of extended objects in the vicinity of M81 based a set of 24 Hubble Space Telescope Advanced Camera for Surveys (ACS) Wide Field Camera (WFC) F814W (I-band) images. We have found 233 good globular cluster candidates; 92 candidate HII regions, OB associations, or diffuse open clusters; 489 probable background galaxies; and 1719 unclassified objects. We have color data from ground-based g- and r-band MMT Megacam images for 79 galaxies, 125 globular cluster candidates, 7 HII regions, and 184 unclassified objects. The color-color diagram of globular cluster candidates shows that most fall into the range 0.25 < g-r < 1.25 and 0.5 < r-I < 1.25, similar to the color range of Milky Way globular clusters. Unclassified objects are often blue, suggesting that many of them are likely to be HII regions and open clusters, although a few galaxies and globular clusters may be among them.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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