论文标题
Supernova残留物附近的OH MASERS碰撞抽水
Collisional Pumping of OH Masers near Supernova Remnants
论文作者
论文摘要
考虑到Supernova残留物附近的非分离性C型冲击中OH MASERS的碰撞泵送。研究了OH线中MASER发射的出现，以获得各种冲击参数 - 冲击速度，前气体密度，宇宙射线电离速率和磁场强度。以高气离子化速率达到1720 MHz线中最大的光学深度$ζ\ geq 10^{ - 15} $ s $^{ - 1} $，一个初始密度$ n _ {\ rm h，0} \ rm h，0} \ leq \ leq 2 \ leq 2 \ times 10^4 $ cm $^4 $ cm $^{ - 3} $ s s $ s s $ s s $ s s ym s s $ s s s $ s s s $ s s s ym s s s $ s s s ym s s ym s s s $ s s s s $ s s ym s s ym s s ym s s ym___ km s $^{ - 1} $。根据我们的计算，激发OH旋转状态的6049和4765 MHz过渡也有水平的种群反转。但是，对于所有研究的休克参数，这些线中的光学深度很小，这解释了超新星残留物中这些线中Maser发射的未检测。
The collisional pumping of OH masers in non-dissociative C-type shocks near supernova remnants is considered. The emergence of maser emission in OH lines is investigated for various shock parameters - the shock speed, the preshock gas density, the cosmic-ray ionization rate, and the magnetic field strength. The largest optical depth in the 1720 MHz line is reached at high gas ionization rates $ζ\geq 10^{-15}$ s$^{-1}$, an initial density $n_{\rm H,0} \leq 2 \times 10^4$ cm$^{-3}$, and a shock speed $u_{\rm s} \geq 20$ km s$^{-1}$. According to our calculations, there is also a level population inversion for the 6049 and 4765 MHz transitions of excited OH rotational states. However, the optical depth in these lines is small for all of the investigated shock parameters, which explains the non-detection of maser emission in these lines in supernova remnants.
