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arXiv 0806.3049astro-ph
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麦哲伦星系扩展天体的总目录

A general catalogue of extended objects in the Magellanic System

Eduardo Bica, Charles Bonatto, Carlos Dutra, Joao F. C. Santos

摘要:

我们更新的SMC,桥,和LMC目录的扩展对象,由我们的小组成员从1995年到2000年。除了前面的课程的丰富的后续文献,我们现在还包括HI壳和超壳。共有9305个物体被交叉识别,而我们以前的目录总计7900个条目,增加了$\approx12%$。我们提出的结果,在子目录包含1445发射星云,3740星团,3326协会,和794 HI壳和超壳。角和表观尺寸分布的扩展对象进行了分析。我们的结论是,对象,在一般情况下,出现响应所产生的潮汐效应从LMC,SMC,和桥梁。沿平行和垂直于LMC条的方向提取的数密度分布可以用两个指数圆盘来描述。一个单一的指数磁盘适合等效的SMC配置文件。有趣的是,当考虑大多数扩展对象的角平均数密度时,两个云的轮廓并不遵循指数盘。相反,它们最好用潮汐截断的核心/晕轮廓来描述,尽管云显然是受干扰的盘。另一方面,孤立的老星团呈指数盘状分布。目前的目录是一个重要的工具,可用来明确地查明目前CCD调查中以前的物体,并确定新的发现。

英文摘要:

We update the SMC, Bridge, and LMC catalogues of extended objects that were constructed by members of our group from 1995 to 2000. In addition to the rich subsequent literature for the previous classes, we now also include HI shells and supershells. A total of 9305 objects were cross-identified, while our previous catalogues amounted to 7900 entries, an increase of $\approx12%$. We present the results in subcatalogues containing 1445 emission nebulae, 3740 star clusters, 3326 associations, and 794 HI shells and supershells. Angular and apparent size distributions of the extended objects are analysed. We conclude that the objects, in general, appear to respond to tidal effects arising from the LMC, SMC, and Bridge. Number-density profiles extracted along directions parallel and perpendicular to the LMC bar, can be described by two exponential-disks. A single exponential-disk fits the equivalent SMC profiles. Interestingly, when angular-averaged number-densities of most of the extended objects are considered, the profiles of both Clouds do not follow an exponential-disk. Rather, they are best described by a tidally-truncated, core/halo profile, despite the fact that the Clouds are clearly disturbed disks. On the other hand, the older star clusters taken isolately, distribute as an exponential disk. The present catalogue is an important tool for the unambiguous identification of previous objects in current CCD surveys and to establish new findings.

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