Dust in the Tycho, Kepler and Crab supernova remnants
Dust in the Tycho, Kepler and Crab supernova remnants
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第谷、开普勒和蟹状超新星遗迹中的尘埃
DOI：
10.1051/0004-6361:20010447
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发表时间：
2001
影响因子：
6.5
通讯作者：
E. Dwek
中科院分区：
文献类型：
--
作者：
T. Douvion;P. Lagage;C. Cesarsky;E. Dwek
超新星遗迹（SNR）在无线电、X射线和光学方面得到了广泛的研究，但在红外（IR）方面几乎没有研究。从IRAS观测，SNR是已知的红外发射器，但发射的起源是难以评估的，因为有限的角度和光谱分辨率的IRAS观测。ISO对仙后座-A SNR的后续观测表明，来自该残骸的中红外辐射主要是由SN材料制成的硅酸盐冷凝物的热辐射。这些凝聚体构成了一个探针，可以提供有关SN内部元素混合的独特信息。在本文中，我们提出了ISOCAM观测的其他三个年轻的SNR的已知在我们的银河系：开普勒SNR，第谷SNR和蟹状星云。从开普勒SNR观测到的辐射主要是尘埃热辐射。尘埃在红外辐射的起源是拱星，而不是从SN凝聚。“天文学”硅酸盐，碰撞加热到107 K的温度，可以占中红外ISO数据和红外天文台的数据。来自第谷的红外辐射可能也是由星周或星际尘埃发出的。为了再现中红外ISO数据和IRAS数据，需要一个具有两个尘埃成分的模型，一个在107 K的温度下，另一个在55 K。蟹状星云的中红外辐射主要是同步辐射，没有探测到尘埃。
SuperNova Remnants (SNR) have been extensively studied in radio, X-rays and optical, but barely in the InfraRed (IR). From IRAS observations, SNR are known to be IR emitters, but the origin of the emission is difficult to assess because of the limited angular and spectral resolution of IRAS observations. ISO follow-up observations of the Cassiopeia-A SNR have shown that the mid-IR radiation from this remnant was dominated by thermal emission from silicate condensates made from SN material. These condensates constitute a probe which can provide unique information about element mixing inside a SN. In this paper, we present ISOCAM observations of the three other young SNR's known in our galaxy: the Kepler SNR, the Tycho SNR and the Crab Nebula. The emission observed from the Kepler SNR is dominated by dust thermal emission. The dust at the origin of the IR emission is circumstellar, not from SN condensates. "Astronomical" silicates, collisionally heated to a temperature of 107 K, can account for both the mid-IR ISO data and the IRAS data. The IR emission from Tycho is probably also emitted by circumstellar or interstellar dust. In order to reproduce both the mid-IR ISO data and the IRAS data, a model with two dust components, one at a temperature of 107 K and the other at 55 K, is needed. The mid-IR emission from the Crab is dominated by synchrotron radiation; no dust is detected.