Multi-wavelength study of a new sample of blue compact dwarf galaxies IV. Optical multi-pupil spectroscopy of 18 objects ?
Multi-wavelength study of a new sample of blue compact dwarf galaxies IV. Optical multi-pupil spectroscopy of 18 objects ?
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蓝致密矮星系新样本的多波长研究 IV。
DOI：
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发表时间：
2002
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通讯作者：
S. Dodonov
中科院分区：
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作者：
A. Petrosian;T. Movsessian;G. Comte;D. Kunth;S. Dodonov
本文介绍了在俄罗斯天文台6米望远镜上对18颗蓝致密矮星系进行的多光瞳积分场光谱观测。我们产生的H，（OIII），（SII）的发射线强度分布，激发参数（（OIII）/H比），连续映射在蓝色和红色和速度场的二维光谱导出的图集。我们提供了详细的个人描述的对象与表的光谱特性。从图集和速度图，我们已经分类的样品根据以下方案：-九个对象显示空间上一致的分布，相对于他们的发射线，激发参数和contin- uum。在这种情况下，这些星系是在同一空间位置重复恒星形成序列。Mrk 1416也属于这类BCDG，但有一个次级星星形成点。- 八个天体的发射谱线亮度分布、激发参数分布和连续谱强度分布有不同程度的差异。这些天体是具有不同年龄和空间位置的几个星星形成地点的星系。它们可以作为检验星星形成模型的理想模板。- 从2-D（SII）的发射线分布，我们发现一个对象中的超级气泡结构，并可能在其他2个。- 10个物体显示出总体上相当规则的径向速度梯度。另一方面，在8个物体中，这一规则速度场的运动学主轴与光度学主轴不一致，表明存在动力学扰动、气体/星星解耦和/或不稳定性。- 六个物体有不规则的速度场，这意味着气体盘的旋转不是它们的主要动力学特征。- SBS 1723+ 565 B不是一个矮星系，而是一个巨大的不规则星系，或者是一个具有高星星形成率的相互作用系统。
We present the multi-pupil integral field spectroscopy of 18 Blue Compact Dwarf Galaxies performed at the 6 m telescope of the SAO (Russia). We produce an atlas of the H, (OIII), (SII) emission-line intensity distributions, the excitation parameter ((OIII)/H ratio), the continuum maps in blue and red and the velocity fields as derived from the 2D spectra. We provide detailed individual descriptions of the objects with a table of their spectroscopic properties. From the atlas and the velocity maps, we have classified the sample according to the following scheme: - Nine objects show spatially coincident distributions with respect to their emission lines, excitation parameter and the contin- uum. In this case, these galaxies are repeating star-formation sequences at the same spatial location. Mrk 1416 also belongs to this class of BCDG but has a secondary site of star formation. - Eight objects in which the distributions in emission lines brightness, excitation parameter and in continuum strength dier from each other at various degrees. These objects are galaxies with several sites of star formation of various ages and spatial locations. They can be ideal templates for testing the models of star formation. - From the 2-D (SII) emission-line distribution we find a superbubble structure in one object and possibly in 2 others. - Ten objects show an overall quite regular radial velocity gradient. On the other hand, in 8 objects, the kinematical major axis of this regular velocity field does not align with the photometric major axis, suggesting dynamical disturbances, gas/star decoupling and/or instabilities. - Six objects have irregular velocity fields, implying that the rotation of a gaseous disk is not their dominant dynamical signature. - SBS 1723+565B is not a dwarf galaxy but a giant irregular galaxy or an interacting system experiencing a high star formation rate.