恒星形成星系的深层多波段表面测光：I。24个蓝色致密星系的样本
Deep multiband surface photometry on star forming galaxies: I. A sample of 24 blue compact galaxies
摘要：
[摘要]我们提出了24个蓝色紧凑星系（BCGs）的深光学和近红外UBVRIKs成像数据。该样本包含发光的矮和中等质量的BCGs，它们主要是贫金属的，尽管少数具有近太阳的金属丰度。我们分析了样品中每个星系的等照度线和椭圆积分表面亮度和颜色轮廓，极深（μ B<29 mag arcsec^{-2}）等高线图和RGB图像。的颜色进行比较，不同的光谱演化模型。我们探测到了在Holmberg半径以外占主导地位的极扩展的低表面亮度（LSB）分量，以及在μ V~ 28等角秒^{-2}等光度线水平上的伴星系之间的光学桥。中心表面亮度μ_0和标度长度h_r来自两个径向范围，这两个径向范围通常被认为是由下面的宿主星系主导的。我们发现BCGs的mu_0和h_r与矮椭圆星系（dE）和矮不规则星系（dI）的mu_0和h_r的偏离仅仅是由于强烈的爆发对表面亮度轮廓的贡献几乎下降到Holmberg半径。在我们的样本中，从较暗的区域（μ B=26-28 mag arcsec^{-2}）获得的结构参数与恒星爆发的BCGs的真实LSB星系一致，与恒星形成不太活跃的BCGs的dEs和dIs一致。
英文摘要：
[Abridged] We present deep optical and near-infrared UBVRIHKs imaging data for 24 blue compact galaxies (BCGs). The sample contains luminous dwarf and intermediate-mass BCGs which are predominantly metal-poor, although a few have near-solar metallicities. We have analyzed isophotal and elliptical integration surface brightness and color profiles, extremely deep (mu_B<29 mag arcsec^{-2}) contour maps and RGB images for each galaxy in the sample. The colors are compared to different spectral evolutionary models. We detect extremely extended low surface brightness (LSB) components dominant beyond the Holmberg radius as well as optical bridges between companion galaxies at the mu_V~28th mag arcsec^{-2} isophotal level. The central surface brightness mu_0 and scale length h_r are derived from two radial ranges typically assumed to be dominated by the underlying host galaxy. We find that mu_0 and h_r of the BCGs host deviate from those of dwarf ellipticals (dE) and dwarf irregulars (dI) solely due to a strong burst contribution to the surface brightness profile almost down to the Holmberg radius. Structural parameters obtained from a fainter region, mu_B=26-28 mag arcsec^{-2}, are consistent with those of true LSB galaxies for the starbursting BCGs in our sample, and with dEs and dIs for the BCGs with less vigorous star formation.
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