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arXiv 0810.0802astro-ph
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超新星遗迹3C 396的近红外[Fe II ]和H2谱线观测:探测超新星前的星周物质

Near-Infrared [Fe II] and H2 Line Observations of the Supernova Remnant 3C 396: Probing the Pre-supernova Circumstellar Materials

Ho-Gyu Lee, Dae-Sik Moon, Bon-Chul Koo, Jae-Joon Lee, Keith Matthews

摘要:

我们提出的近红外[Fe II]和H2线成像和光谱观测的超新星遗迹3C 396使用Palomar 5米海尔望远镜的结果。我们检测到长期的,间接的[Fe II]发射描绘的无线电发射的内边缘在西部边界的残留物在成像观测,连同一个明亮的[Fe II]发射团靠近残留物中心。似乎有微弱的,弥漫的[Fe II]发射之间的中央团块和西方的间接排放。光谱观测确定了中央团块的膨胀速度约为56 km/s。这远远小于从X射线观测中获得的3C 396的膨胀速度,这意味着周围介质的不均匀性。[Fe II]发射气体的电子数密度<2,000 cm-3。另一方面,H2线发射位于西部边界的非连续[Fe II]发射之外,并形成一个相当直的灯丝。我们认为,[Fe II]的排放代表密集的团块风的材料从红超巨星阶段的IIL/b型祖3C 396已被席卷的超新星遗迹冲击。H2的排放可能代表在主序阶段的祖细胞或分子团留在气泡内产生的风泡的边界。我们提出,在几个超新星遗迹中观察到的近红外[Fe II]和H2发射的类型IIL/b SNe可能有相同的起源。

英文摘要:

We present the results of near-infrared [Fe II] and H2 line imaging and spectroscopic observations of the supernova remnant 3C 396 using the Palomar 5 m Hale telescope. We detect long, filamentary [Fe II] emission delineating the inner edge of the radio emission in the western boundary of the remnant in imaging observations, together with a bright [Fe II] emission clump close to the remnant center. There appears to be faint, diffuse [Fe II] emission between the central clump and the western filamentary emission. The spectroscopic observations determine the expansion velocity of the central clump to be ~56 km/s. This is far smaller than the expansion velocity of 3C 396 obtained from X-ray observations, implying the inhomogeneity of the ambient medium. The electron number density of the [Fe II] emission gas is < 2,000 cm-3. The H2 line emission, on the other hand, lies slightly outside the filamentary [Fe II] emission in the western boundary, and forms a rather straight filament. We suggest that the [Fe II] emission represents dense clumps in the wind material from the red supergiant phase of a Type IIL/b progenitor of 3C 396 which have been swept up by the supernova remnant shocks. The H2 emission may represent either the boundary of a wind bubble produced during the main-sequence phase of the progenitor or molecular clumps left over inside the bubble. We propose that the near-infrared [Fe II] and H2 emission observed in several supernova remnants of Type IIL/b SNe likely has the same origin.

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