论文标题
Spitzer和Herschel对小麦芽云中超新星残留物中的灰尘研究
Spitzer and Herschel studies of dust in supernova remnants in the Small Magellanic Cloud
论文作者
论文摘要
通过由Spitzer空间望远镜和Herschel空间天文台绘制的整个小麦芽云（SMC），我们能够搜索8-250微米的图像，以识别与SMC超新星残留物（SNRS）相关的红外发射（IR）发射。有效的检测必须与SNRS的已知X射线，HALPHA和无线电发射相对应。从已知的24个SNR中，我们用另外5个可能的检测进行了5个阳性检测。两种检测与脉冲星或脉冲星风星云有关，另外三个检测是SNRS延长的脉络膜发射的一部分。我们对尘埃发射进行了建模，其中预计快速移动的电子会发生碰撞和热粉尘晶粒，然后在IR中辐射。具有已知距离（62.44+-0.47KPC），测得的SNR尺寸，电子密度，X射线发射的温度以及氢密度，SMC SNR的建模很简单。 如果要接受较高的氢和电子密度范围，我们预计至少在24微米时会在IR中检测到几乎所有SMC SNR，但实际检测率仅为25％。这一差异的一种可能且常见的解释是，SNRS Shockwave已经破坏了小谷物。但是，在氢和电子密度的不确定性中，我们发现红外粉尘发射可以很好地解释，而不会引起粉尘破坏。没有结论性的证据表明SNR摧毁了扫除的ISM尘埃。
With the entire Small Magellanic Cloud (SMC) mapped by the Spitzer Space Telescope and Herschel Space Observatory, we were able to search 8-250 micron images in order to identify infrared (IR) emission associated with SMC supernova remnants (SNRs). A valid detection had to correspond with known X-ray, Halpha and radio emission from the SNRs. From the 24 known SNRs, we made 5 positive detections with another 5 possible detections. Two detections are associated with pulsars or pulsar wind nebula, and another three detections are part of the extended nebulous emission from the SNRs. We modelled dust emission where fast moving electrons are predicted to collide and heat dust grains which then radiate in IR. With known distance (62.44+-0.47kpc), measured SNR sizes, electron densities, temperatures from X-ray emission as well as hydrogen densities, the modelling of SMC SNRs is straightforward. If the higher range of hydrogen and electron densities were to be accepted, we would expect almost all SMC SNRs to be detected in the IR, at least at 24 micron, but the actual detection rate is only 25%. One possible and common explanation for this discrepancy is that small grains have been destroyed by the SNRs shockwave. However, within the uncertainties of hydrogen and electron densities, we find that infrared dust emission can be explained reasonably well, without invoking dust destruction. There is no conclusive evidence that SNRs destroy swept-up ISM dust.
