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arXiv 1005.4248astro-ph.CO
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带有斯皮策IRS的椭圆星系尘埃带的PAH辐射

PAH emission from the dust lane of an elliptical galaxy with the Spitzer IRS

Hidehiro Kaneda, Takashi Onaka, Itsuki Sakon, Tetsu Kitayama, Yoko Okada, Toyoaki Suzuki, Daisuke Ishihara, Mitsuyoshi Yamagishi

摘要:

斯皮策和AKARI的观测发现,多环芳烃(PAHs)存在于附近的椭圆星系中,但其空间分布仍然未知。为了研究它们的分布,我们对PAH探测到的椭圆星系NGC4589进行了深光谱测绘观测,NGC4589是一个具有短轴光学尘埃带的合并遗迹。因此,我们得到明确的证据表明,PAH 11.3 μ m的发射主要来自星系的尘埃带。我们还探测到尘埃带的氢分子谱线发射。PAH 17 μ m发射的分布与PAH 11.3 μ m发射的分布不同,而与尘埃连续谱发射的分布更相似。从其独特的分布,我们认为,负责11.3微米功能的多环芳烃是通过合并带来的ISM的演变的次级产品。

英文摘要:

Spitzer and AKARI observations have found that polycyclic aromatic hydrocarbons (PAHs) are present in nearby elliptical galaxies, but their spatial distributions are still unknown. In order to investigate their distributions, we performed deep spectral mapping observations of the PAH-detected elliptical galaxy NGC4589, a merger remnant with a minor-axis optical dust lane. As a result, we obtain clear evidence that the PAH 11.3 um emission comes predominantly from the dust lane of the galaxy. We also detect molecular hydrogen line emissions from the dust lane. The PAH 17 um emission is distributed differently from the PAH 11.3 um emission, and more similarly to the dust continuum emission. From their distinctive distributions, we suggest that the PAHs responsible for the 11.3 um feature are secondary products through the evolution of the ISM brought in by the merger.

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