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Systematic observations on Galactic Interstellar isotope ratios

Published online by Cambridge University Press:  03 March 2020

J. S. Zhang ,
Y. T. Yan ,
W. Liu ,
H. Z. Yu ,
J. L. Chen  and
C. Henkel
J. S. Zhang
Affiliation:
Center for Astrophysics, Guangzhou University, Guangzhou 510006, China email: jszhang@gzhu.edu.cn
Y. T. Yan
Affiliation:
Center for Astrophysics, Guangzhou University, Guangzhou 510006, China email: jszhang@gzhu.edu.cn
W. Liu
Affiliation:
Center for Astrophysics, Guangzhou University, Guangzhou 510006, China email: jszhang@gzhu.edu.cn
H. Z. Yu
Affiliation:
Center for Astrophysics, Guangzhou University, Guangzhou 510006, China email: jszhang@gzhu.edu.cn
J. L. Chen
Affiliation:
Center for Astrophysics, Guangzhou University, Guangzhou 510006, China email: jszhang@gzhu.edu.cn
C. Henkel
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany Astron. Dept., King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
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Abstract

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We are performing systematic observation studies on the Galactic interstellar isotopic ratios, including 18O/17O, 12C/13C, 14N/15N and 32S/34S. Our strategy focuses on combination of multi-transition observation data toward large samples with different Galactocentric distances. Our preliminary results show positive Galactic radial gradients of 18O/17O and 12C/13C. In both cases, the ratio increases with the Galactocentric distance, which agrees with the inside-out scenario of our Galaxy. Observations of other isotopes such as 14N/15N and 32S/34S are on-going.

Keywords

ISMisotopic ratiossystematic observationsgradient

References

Zhang, et al. 2015, ApJS, 219, 2, 28 Google Scholar
Li, et al. 2016, RAA, 16, 47 Google Scholar