Extended mid-infrared aromatic feature emission in M82
Extended mid-infrared aromatic feature emission in M82
复制标题
DOI：
10.1086/504590
复制
发表时间：
2006-05-10
影响因子：
4.9
通讯作者：
Sheth, K.
中科院分区：
文献类型：
--
作者：
Engelbracht, C. W.;Kundurthy, P.;Sheth, K.
我们展示了原型星暴星系 M82 的新图像（来自斯皮策太空望远镜的地基光学和中红外 [MIR]）和光谱（来自斯皮策）。斯皮策数据显示，中红外辐射沿星系短轴延伸至少 6 kpc。我们使用光学和红外数据来证明扩展发射主要是灰尘发射。 MIR 发射的颜色和光谱表明存在很强的芳香族特征发射成分（MIR 特征通常归因于多环芳烃）。在这个星系著名的超级风区，尘埃连续体和芳香特征排放都很强；显然，芳香特征的载体可以在远离银河系、靠近风的地方生存。我们还看到超风区域之外的大量尘埃排放，提供了迄今为止该星系晕中尘埃分布的最清晰图像。
We present new images (ground-based optical and mid-infrared [MIR] from the Spitzer Space Telescope) and spectra (from Spitzer) of the archetypal starburst galaxy M82. The Spitzer data show that the MIR emission extends at least 6 kpc along the minor axis of the galaxy. We use the optical and infrared data to demonstrate that the extended emission is dominated by emission from dust. The colors of the MIR emission and the spectra indicate that there is a strong component of aromatic feature emission (the MIR features commonly attributed to polycyclic aromatic hydrocarbons). The dust continuum and aromatic feature emission are both strong in the well-known superwind region of this galaxy; clearly, the carrier of the aromatic features can survive in close proximity to the wind, far from the plane of the galaxy. We also see significant emission by dust well outside the superwind region, providing the clearest picture to date of the dust distribution in the halo of this galaxy.