Tycho SN 1572：一个没有关联环境分子云的Ia超新星遗迹
Tycho SN 1572: A Naked Ia Supernova Remnant without Associated Ambient Molecular Cloud
摘要：
历史上的超新星遗迹（SNR）第谷SN 1572起源于一颗正常的Ia型超新星的爆炸，这颗超新星被认为起源于一个双星系统中的碳氧白矮星。本文分析了加拿大银道巡天在SN 1572及周围地区的21 cm连续谱、HI和12 CO线资料。我们构造了SN 1572及其附近三个致密源的HI吸收谱。我们的结论是SN 1572没有分子云相互作用，这与以前的说法，分子云与SNR相互作用。这一新结果并不支持最近的一种说法，即AKARI新探测到的尘埃起源于这样的SNR-云相互作用。根据非线性旋转曲线模型，我们认为SNR具有2.5 - 3.0 kpc的运动学距离。VERITAS望远镜已经探测到来自残骸的非常高能量的伽马射线发射，因此我们的结果表明它的起源不应该是SNR-云的相互作用。射电和X射线观测都支持SN 1572是孤立的Ia型信噪比。
英文摘要：
The historical supernova remnant (SNR) Tycho SN 1572 originates from the explosion of a normal Type Ia supernova which is believed to have originated from a carbon-oxygen white dwarf in a binary system. We analyze the 21cm continuum, HI and 12CO-line data from the Canadian Galactic Plane Survey in the direction of SN 1572 and surrounding region. We construct HI absorption spectra to SN 1572 and three nearby compact sources. We conclude that SN 1572 has no molecular cloud interaction, which argues against previous claims that a molecular cloud is interacting with the SNR. This new result does not support a recent claim that dust, newly detected by AKARI, originates from such a SNR-cloud interaction. We suggest that the SNR has a kinematic distance of 2.5 - 3.0 kpc based on a nonlinear rotational curve model. Very-high-energy Gamma-ray emission from the remnant has been detected by the VERITAS telescope, so our result shows that its origin should not be an SNR-cloud interaction. Both radio and X-ray observations support that SN 1572 is an isolated Type Ia SNR.
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