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A Systematic Observational Study on Galactic Interstellar Ratio 18 O/ 17 O. I. C 18 O and C 17 O J = 1–0 Data Analysis
The Astrophysical Journal Supplement Series ( IF 8.7 ) Pub Date : 2020-06-25 , DOI: 10.3847/1538-4365/ab9112
J. S. Zhang 1 , W. Liu 1 , Y. T. Yan 1, 2 , H. Z. Yu 1 , J. T. Liu 1 , Y. H. Zheng 1 , D. Romano 3 , Z.-Y. Zhang 4 , J. Z. Wang 5 , J. L. Chen 1 , Y. X. Wang 1 , W. J. Zhang 1 , H. H. Lu 1 , L. S. Chen 1 , Y. P. Zou 1 , H. Q. Yang 1 , T. Wen 1 , F. S. Lu 1
Affiliation  

The interstellar oxygen isotopic ratio of 18 O/ 17 O can reflect the relative amount of the secular enrichment by ejecta from high-mass versus intermediate-mass stars. Previous observations found a Galactic gradient of 18 O/ 17 O, i.e., low ratios in the Galactic center and large values in the Galactic disk, which supports the inside-out formation scenario of our Galaxy. However, there are not many observed objects and, in particular, there are not many at large galactocentric distances. For this reason, we started a systematic study on Galactic interstellar 18 O/ 17 O, through observations of C 18 O and C 17 O multi-transition lines toward a large sample of 286 sources (at least one order of magnitude larger than previous ones), from the Galactic center region to the far outer Galaxy (∼22 kpc). In this article, we present our observations of J = 1–0 lines of C 18 O and C 17 O, wi...

中文翻译:

银河星际比18 O / 17 OI C 18 O和C 17 OJ = 1–0的系统观测研究

18 O / 17 O的星际氧同位素比可以反映高质量恒星与中等质量恒星的喷射所产生的世俗富集的相对量。先前的观察发现银河系梯度为18 O / 17 O,即银河系中心的比率低而银河系盘中的值较大,这支持了我们银河由内而外的形成情况。但是,观察到的物体并不多,特别是在大的半视距内没有很多。因此,我们通过对286个源的大样本观测C 18 O和C 17 O多跃迁线(至少比先前的星系大一个数量级),开始对银河系星际18 O / 17 O进行系统研究。 ),从银河系中心区域到遥远的外星系(〜22 kpc)。在这篇文章中,
更新日期:2020-06-26
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