M33中原型巨大HII区域NGC604的HST/NICMOS视图
An HST/NICMOS view of the prototypical giant HII region NGC604 in M33
摘要：
我们提出了第一个高空间分辨率的近红外（NIR）成像的NGC 604，获得与NICMOS相机搭载哈勃太空望远镜（HST）。这些NICMOS宽带图像揭示了新的近红外点源，集群和扩散结构。我们发现8.4GHz射电连续谱与2.2 μ m星云辐射之间存在很好的空间相关性。此外，大质量的年轻恒星候选者似乎与这些射电峰值对齐，加强了这些地区是恒星形成区的想法。在NICMOS图像中识别出三种不同比例的OB关联。我们图像中最亮的近红外光源具有表明它们是红超巨星的特性，其中一颗是以前已知的。对NICMOS图像的初步分析显示了NGC 604星云恒星成分的复杂性。
英文摘要：
We present the first high-spatial resolution near-infrared (NIR) imaging of NGC 604, obtained with the NICMOS camera aboard the Hubble Space Telescope (HST). These NICMOS broadband images reveal new NIR point sources, clusters, and diffuse structures. We found an excellent spatial correlation between the 8.4 GHz radio continuum and the 2.2mu-m nebular emission. Moreover, massive young stellar object candidates appear aligned with these radio peaks, reinforcing the idea that those areas are star-forming regions. Three different scaled OB associations are recognized in the NICMOS images. The brightest NIR sources in our images have properties that suggest that they are red supergiant stars, of which one of them was previously known. This preliminary analysis of the NICMOS images shows the complexity of the stellar content of the NGC 604 nebula.
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