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arXiv 0710.1786astro-ph
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IC 65星系群的光度学研究

Photometric study of the IC 65 group of galaxies

J. Vennik, U. Hopp

摘要:

我们对IC 65周围的一个晚型星系群进行了光度研究,目的是:(a)寻找新的矮成员并测量其光度特征;(b)寻找相互作用对发光和暗淡星系群成员的形态和恒星形成特征的可能影响;(c)评估这一特殊星系群的演化状况。我们利用我们的BRI CCD观测,DPOSS蓝色和红色框架,以及2 MASS JHK框架。此外,我们还使用了文献中的HI成像数据、远红外和射电数据。搜索矮星系是使用SExtractor软件进行的。详细的表面光度测定是用MIDAS软件包进行的。四个LSB星系被归类为可能的矮成员的集团和BRI的物理和模型参数推导出第一次为所有真正的和可能的集团成员。在IC 65周围新发现的dIrr星系包含许多H II区域,这些区域显示了一系列的年龄和恒星形成的传播。在几个群成员中发现了轻微扰动的气体和/或恒星形态。各种结构,动力学和恒星形成的特点,让我们得出结论,IC 65集团是一个典型的穷人组装的晚型星系在其动力学演化的早期阶段,有一些证据表明,集团内(潮汐)的相互作用。

英文摘要:

We carry out a photometric study of a poor group of late-type galaxies around IC 65, with the aim: (a) to search for new dwarf members and to measure their photometric characteristics; (b) to search for possible effects of mutual interactions on the morphology and star-formation characteristics of luminous and faint group members; (c) to evaluate the evolutionary status of this particular group. We make use of our BRI CCD observations, DPOSS blue and red frames, and the 2MASS JHK frames. In addition, we use the HI imaging data, the far-infrared and radio data from the literature. Search for dwarf galaxies is made using the SExtractor software. Detailed surface photometry is performed with the MIDAS package. Four LSB galaxies were classified as probable dwarf members of the group and the BRI physical and model parameters were derived for the first time for all true and probable group members. Newly found dIrr galaxies around the IC 65 contain a number of H II regions, which show a range of ages and propagating star-formation. Mildly disturbed gaseous and/or stellar morphology is found in several group members. Various structural, dynamical, and star-forming characteristics let us conclude that the IC 65 group is a typical poor assembly of late-type galaxies at an early stage of its dynamical evolution with some evidence of intragroup (tidal) interactions.

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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