论文标题
中央分子区和远尘车道的交点处的不寻常的银河HII区域
Unusual Galactic HII Regions at the Intersection of the Central Molecular Zone and the Far Dust Lane
论文作者
论文摘要
SGR E是向银河系中心发现的巨大恒星形成络合物，由许多离散的紧凑型HII区组成。它位于中央分子区域（CMZ）和银河杆的远尘埃之间的交点，类似于外部星系中的“热点”。与其他银河恒星形成络合物相比，SGR E配合物是不寻常的，因为其HII区域都具有相似的无线电发光性和角度范围，并且它们从其光解离区域（PDRS）中不足于〜10micron发射。我们的绿色银行望远镜（GBT）无线电重组线观测值将SGR E的已知成员资格增加到19个HII地区。在SGR E方向上有43个HII区域候选者，其中26个使用Meerkat 1.28GHz数据首次检测到其中26个。因此，SGR E的真实HII地区人口可能> 60。使用Apex Sedigism 13CO 2-1数据，我们发现了与SGR E相关的3.0x10^5太阳质量分子云，但在SGR E HII区域的位置发现了很少的分子或远红外浓度。与模拟和对其无线电连续性特性的分析进行比较表明，SGR E在几乎没有Myr之前的银河杆远场上形成，并将超过CMZ，坠入近尘埃车道。我们建议，Sgr e HII区域的异常红外特性是由它们在银河中心轨道上造成的，该中心可能剥离了其PDR。
Sgr E is a massive star formation complex found toward the Galactic center that consists of numerous discrete, compact HII regions. It is located at the intersection between the Central Molecular Zone (CMZ) and the far dust lane of the Galactic bar, similar to "hot spots" seen in external galaxies. Compared with other Galactic star formation complexes, the Sgr E complex is unusual because its HII regions all have similar radio luminosities and angular extents, and they are deficient in ~10micron emission from their photodissociation regions (PDRs). Our Green Bank Telescope (GBT) radio recombination line observations increase the known membership of Sgr E to 19 HII regions. There are 43 additional HII region candidates in the direction of Sgr E, 26 of which are detected for the first time here using MeerKAT 1.28GHz data. Therefore, the true HII region population of Sgr E may number >60. Using APEX SEDIGISM 13CO 2-1 data we discover a 3.0x10^5 Solar mass molecular cloud associated with Sgr E, but find few molecular or far-infrared concentrations at the locations of the Sgr E HII regions. Comparison with simulations and an analysis of its radio continuum properties indicate that Sgr E formed upstream in the far dust lane of the Galactic bar a few Myr ago and will overshoot the CMZ, crashing into the near dust lane. We propose that the unusual infrared properties of the Sgr E HII regions are caused by their orbit about the Galactic center, which have possibly stripped their PDRs.
