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arXiv 2401.01985astro-ph.GAastro-ph.SR
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用 SOFIA 巡测银河系的巨型 HII 区域:VI. NGC 3603

Surveying the Giant HII Regions of the Milky Way with SOFIA: VI. NGC 3603

James M. De Buizer, Wanggi Lim, Nicole Karnath, James T. Radomski

AI总结:

本文利用 SOFIA 的中红外成像数据结合多波段观测,详细分析了银河系最明亮的巨型 HII 区域 NGC 3603,发现了 14 个大质量年轻恒星体,并证实该区域整体年龄较老且属于“空腔型”。

摘要:

我们展示了利用 SOFIA 对银河系巨型 HII 区域进行中红外成像巡天的第六批结果,详细分析了银河系中最明亮的 GHII 区域 NGC 3603。我们使用了平流层红外天文台(SOFIA)上 FORCAST 仪器在 20 和 37 微米处的成像数据,以 <~3" 的空间分辨率绘制了 NGC 3603 中心约 8.5'x8.5' 的红外发射区域。结合从近红外到射电的多波段观测数据,包括 Spitzer-IRAC 和 Herschel-PACS 的存档数据,我们研究了 NGC 3603 内各个红外源及子组分的物理性质。对于单个致密源,我们利用多波段测光数据构建了光谱能量分布(SED),并用大质量年轻恒星体(MYSO)的 SED 模型进行拟合,发现了 14 个很可能是 MYSO 的源。我们还探测到了来自 3 个大质量 proplyd 候选体的尘埃发射,以及演化中的蓝超巨星 Sher 25 的盘和外流的发射。利用多波段数据,我们推导了 NGC 3603 内恒星形成团块的光度质量比和位力参数,估计了它们的相对年龄,发现与我们之前研究的 GHII 区域相比,NGC 3603 整体上是一个较老的 GHII 区域。我们讨论了被归类为“空腔型”GHII 区域的 NGC 3603,与具有相似莱曼连续光子率的“分布型”GHII 区域相比,其 MYSO 和分子团块数量相对较少。

英文摘要:

We present our sixth set of results from our mid-infrared imaging survey of Milky Way Giant HII regions with our detailed analysis of NGC 3603, the most luminous GHII region in the Galaxy. We used imaging data from the FORCAST instrument on the Stratospheric Observatory For Infrared Astronomy (SOFIA) at 20 and 37 microns which mapped the central ~8.5'x8.5' infrared-emitting area of NGC 3603 at a spatial resolution of <~3". Utilizing these SOFIA data in conjunction with multi-wavelength observations from the near-infrared to radio, including Spitzer-IRAC and Herschel-PACS archival data, we investigate the physical nature of individual infrared sources and sub-components within NGC 3603. For individual compact sources we used the multi-wavelength photometry data to construct spectral energy distributions (SEDs) and fit them with massive young stellar object (MYSO) SED models, and find 14 sources that are likely to be MYSOs. We also detect dust emission from the 3 massive proplyd candidates, as well as from the disk and outflow of the evolved blue supergiant, Sher 25. Utilizing multi-wavelength data, we derived luminosity-to-mass ratio and virial parameters for the star-forming clumps within NGC 3603, estimating their relative ages and finding that NGC 3603 is an older GHII region overall, compared to our previously studied GHII regions. We discuss how NGC 3603, which we categorize as a 'cavity-type' GHII region, exhibits a more modest number of MYSOs and molecular clumps when compared to the 'distributed-type' GHII regions that share similar Lyman continuum photon rates.

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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