超新星遗迹G346 .6-0.2中风吹气泡的发现：对等离子体起源的一个提示
Discovery of a Wind-Blown Bubble Associated with the Supernova Remnant G346.6-0.2: A Hint for the Origin of Recombining Plasma
摘要：
我们报告的CO和HI研究的混合形态超新星遗迹（SNR）G346.6 $-$ 0.2。我们发现一个风吹泡沿无线电连续壳的膨胀速度为$\sim10$公里秒$^{-1}$，这可能是由强大的恒星风从高质量的SNR祖。CO/HI泡在$V_\mathrm{LSR} = -82$ - $-59$ km s $^{-1}$的径向速度也与激波激发的1720 MHz OH脉泽的径向速度一致。东北壳层的分子云显示出$\sim60$ K的高动力学温度，表明发生了激波加热。HI吸收研究表明，G346.6 $-$ 0.2位于银河系中心的远侧，SNR的运动学距离为$11.1_{-0.3}^{+0.5}$ kpc。我们发现CO谱线强度与复合等离子体的电子温度没有特定的相关性，这意味着G346.6 $-$ 0.2中的复合等离子体可能是绝热冷却产生的。通过对星际质子密度280 cm $^{-3}$和γ射线光度$< 5.8 \times 10^{34}$ erg s $^{-1}$的估算，得到了加速宇宙线总能量$W_{\rm p} < 9.3 \times 10^{47}$ erg。年龄- $W_{\rm p}$关系与其他SNR的比较表明，G346.6 $-$ 0.2中的大部分加速宇宙射线已经从SNR壳层逃逸。
英文摘要：
We report on CO and HI studies of the mixed-morphology supernova remnant (SNR) G346.6$-$0.2. We find a wind-blown bubble along the radio continuum shell with an expansion velocity of $\sim10$ km s$^{-1}$, which was likely formed by strong stellar winds from the high-mass progenitor of the SNR. The radial velocities of the CO/HI bubbles at $V_\mathrm{LSR} = -82$-$-59$ km s$^{-1}$ are also consistent with those of shock-excited 1720 MHz OH masers. The molecular cloud in the northeastern shell shows a high-kinetic temperature of $\sim60$ K, suggesting that shock-heating occurred. The HI absorption studies imply that G346.6$-$0.2 is located on the far side of the Galactic center from us, and the kinematic distance of the SNR is derived to be $11.1_{-0.3}^{+0.5}$ kpc. We find that the CO line intensity has no specific correlation with the electron temperature of recombining plasma, implying that the recombining plasma in G346.6$-$0.2 was likely produced by adiabatic cooling. With our estimates of the interstellar proton density 280 cm$^{-3}$ and gamma-ray luminosity $< 5.8 \times 10^{34}$ erg s$^{-1}$, the total energy of accelerated cosmic rays $W_{\rm p} < 9.3 \times 10^{47}$ erg is obtained. A comparison of the age-$W_{\rm p}$ relation to other SNRs suggests that most of the accelerated cosmic rays in G346.6$-$0.2 have been escaped from the SNR shell.
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