Interstellar Nitrogen Isotope Ratios: New NH3 Data from the Galactic Center out to the Perseus Arm
J. L. Chen,
J. S. Zhang,
C. Henkel
et al.
Abstract:Our aim is to measure the interstellar 14 N/ 15 N ratio across the Galaxy, to establish a standard data set on interstellar ammonia isotope ratios and to provide new constraints on the Galactic chemical evolution. The (J, K) = (1, 1), (2, 2) and (3, 3) lines of 14 NH 3 and 15 NH 3 were observed with the Shanghai Tianma 65 m radio telescope (TMRT) and the Effelsberg-100 m telescope toward a large sample of 210 sources. 141 of these sources were detected by the TMRT in 14 NH 3 . 8 out of them were also detected … Show more
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