Kes 69和G21 .5-0.9的信噪比与HI和~（13）CO光谱的距离
The Distances of SNRs Kes 69 and G21.5-0.9 from HI and 13CO Spectra
摘要：
我们获得了新的HI和$^{13}$ CO图像周围的超新星遗迹（SNR）Kes 69和G21.5-0.9。通过比较HI谱和$^{13}$ CO发射谱，我们将Kes 69的运动学距离修正为$\sim$ 5.5 kpc，即11.2 kpc，并将G21.5-0.9的运动学距离修正为~4.8 kpc。对于Kes 69，最高吸收速度为~86 km/s，在~ 112 km/s处的显著HI发射特征没有相应的吸收。这些新的结果表明，Kes 69与一个新探测到的扩展的1720 MHz OH脉泽有关，其速度约为85 km/s，起源于Kes 69明亮的南部射电壳层内。对于G21.5-0.9，最高吸收速度约为67 km/s。附近亮源PMN J1832-1035和Kes 69的HI吸收光谱在~69 km/s的速度下显示出共同的吸收特征，这在G21.5-0.9中没有看到。由此得到的速度约为68 km/s，给出了G21.5-0.9和相关年轻脉冲星J1833-1034的最佳距离估计约为4.8 kpc。
英文摘要：
We obtain new HI and $^{13}$CO images around Supernova Remnants (SNR) Kes 69 and G21.5-0.9. By comparing HI spectra with $^{13}$CO emission spectra, we significantly revise the kinematic distance for Kes 69 to $\sim$ 5.5 kpc, which was 11.2 kpc, and refine the kinematic distance for G21.5-0.9 to ~4.8 kpc. For Kes 69, the highest velocity of absorption is ~86 km/s and a prominent HI emission feature at ~ 112 km/s has no respective absorption. These new results suggest that Kes 69 is associated with a newly detected extended 1720 MHz OH maser at velocity of ~85 km/s that originates from within the bright southern radio shell of Kes 69. For G21.5-0.9, the highest velocity of absorption is ~67 km/s. The HI absorption spectra of the nearby bright source PMN J1832-1035 and of Kes 69 show a common absorption feature at velocity of ~69 km/s, which is not seen for G21.5-0.9. The resulting velocity of ~68 km/s gives the best distance estimate of ~4.8 kpc for G21.5-0.9 and associated young pulsar J1833-1034.
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