69 citations · 220 across the 12 of their papers we have counts for
12 papers
Interstellar Nitrogen Isotope Ratios: Measurements on tracers of CN and CN
J. L. Chen, J. S. Zhang, C. Henkel +6
The nitrogen isotope ratio 14N/15N is a powerful tool to trace Galactic stellar nucleosynthesis and constraining Galactic chemical evolution. Previous observations have found lower…
An ALCHEMI inspection of sulphur-bearing species towards the central molecular zone of NGC 253
M. Bouvier, S. Viti, E. Behrens +19
Sulphur-bearing species are detected in various environments within Galactic star-forming regions and are particularly abundant in the gas phase of outflows and shocks, and photo-d…
Discovery of widespread non-metastable ammonia masers in the Milky Way
Y. T. Yan, C. Henkel, K. M. Menten +8
We present the results of a search for ammonia maser emission in 119 Galactic high-mass star-forming regions (HMSFRs) known to host 22 GHz HO maser emission. Our survey has led…
Molecular isotopologue measurements toward super star clusters and the relation to their ages in NGC253 with ALCHEMI
J. Butterworth, S. Viti, P. P. Van der Werf +18
Determining the evolution of the CNO isotopes in the interstellar medium (ISM) of starburst galaxies can yield important constraints on the ages of superstar clusters (SSCs), or on…
A Systematic Observational Study on Galactic Interstellar Ratio 18O/17O. II. C18O and C17O J=2-1 Data Analysis
Y. P. Zou, J. S. Zhang, C. Henkel +7
To investigate the relative amount of ejecta from high-mass versus intermediate-mass stars and to trace the chemical evolution of the Galaxy, we have performed with the IRAM 30m an…
Direct measurements of carbon and sulfur isotope ratios in the Milky Way
Y. T. Yan, C. Henkel, C. Kobayashi +7
With the IRAM 30 meter telescope, we performed observations of the = 2-1 transitions of CS, CS, CS, CS, CS, CS, and CS a…
Interstellar Nitrogen Isotope Ratios: New NH3 Data from the Galactic Center out to the Perseus Arm
J. L. Chen, J. S. Zhang, C. Henkel +10
Our aim is to measure the interstellar 14N/15N ratio across the Galaxy, to establish a standard data set on interstellar ammonia isotope ratios, and to provide new constraints on t…
Cyanopolyyne line survey towards high-mass star-forming regions with TMRT
Y. X. Wang, J. S. Zhang, Y. T. Yan +8
We carried out a cyanopolyyne line survey towards a large sample of HMSFRs using the Shanghai Tian Ma 65m Radio Telescope (TMRT). Our sample consisted of 123 targets taken from the…
Discovery of ammonia (9,6) masers in two high-mass star-forming regions
Y. T. Yan, C. Henkel, K. M. Menten +8
Molecular maser lines are signposts of high-mass star formation, probing excitation and kinematics of very compact regions in the close environment of young stellar objects and pro…
Galactic interstellar sulfur isotopes: A radial SS gradient?
H. Z. Yu, J. S. Zhang, C. Henkel +9
We present observations of CS, CS, CS and CS J=21 lines toward a large sample of massive star forming regions by using th…
A systematic observational study on Galactic interstellar ratio 18O/17O: I. C18O and C17O J=1-0 data analysis
J. S. Zhang, W. Liu, Y. T. Yan +15
The interstellar oxygen isotopic ratio of 18O/17O can reflect the relative amount of the secular enrichment by ejecta from high-mass versus intermediate-mass stars. Previous observ…
A systematic TMRT observational study of Galactic C/C ratios from Formaldehyde
Y. T. Yan, J. S. Zhang, C. Henkel +10
We present observations of the C-band (4.8 GHz) and Ku-band (14.5 GHz) K-doublet lines of HCO and the C-band (4.6 GHz) line of H…