Zobrazeno 1 - 10
of 309
pro vyhledávání: '"Yan, Y. T."'
Autor:
Chen, J. L., Zhang, J. S., Henkel, C., Yan, Y. T., Yu, H. Z., Wang, Y. X., Zou, Y. P., Zhao, J. Y., Wang, X. Y.
Publikováno v:
The Astrophysical Journal (2004)
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 14N/15N ratios in the Galactic center and higher values in the Galact
Externí odkaz:
http://arxiv.org/abs/2406.09683
Autor:
Bouvier, M., Viti, S., Behrens, E., Butterworth, J., Huang, K. -Y., Mangum, J. G., Harada, N., Martín, S., Rivilla, V. M., Muller, S., Sakamoto, K., Yoshimura, Y., Tanaka, K., Nakanishi, K., Herrero-Illana, R., Colzi, L., Gorski, M. D., Henkel, C., Humire, P. K., Meier, D. S., van der Werf, P. P., Yan, Y. T.
Publikováno v:
A&A 689, A64 (2024)
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-dissociation regions. In this work, we aim to investigate the nature of
Externí odkaz:
http://arxiv.org/abs/2405.08408
Autor:
Yan, Y. T., Henkel, C., Menten, K. M., Wilson, T. L., Wootten, A., Gong, Y., Wyrowski, F., Yang, W., Brunthaler, A., Kraus, A., Winkel, B.
Publikováno v:
A&A 686, A205 (2024)
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 H$_2$O maser emission. Our survey has led to the discovery of non-metastable NH$_3$ inversion line masers towar
Externí odkaz:
http://arxiv.org/abs/2403.18001
Autor:
Butterworth, J., Viti, S., Van der Werf, P. P., Mangum, J. G., Martín, S., Harada, N., Emig, K. L., Muller, S., Sakamoto, K., Yoshimura, Y., Tanaka, K., Herrero-Illana, R., Colzi, L., Rivilla, V. M., Huang, K. Y., Bouvier, M., Behrens, E., Henkel, C., Yan, Y. T., Meier, D. S., Zhou, D.
Publikováno v:
A&A 686, A31 (2024)
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 other aspects and contributing factors of their evolution. Due to the
Externí odkaz:
http://arxiv.org/abs/2402.10721
Autor:
Zou, Y. P., Zhang, J. S., Henkel, C., Romano, D., Liu, W., Zheng, Y. H., Yan, Y. T., Chen, J. L., Wang, Y. X., Zhao, J. Y.
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 and the SMT 10m telescopes a systematic study of Galactic interstellar 1
Externí odkaz:
http://arxiv.org/abs/2311.00547
Autor:
Gong, Y., Henkel, C., Menten, K. M., Chen, C. -H. R., Zhang, Z. Y., Yan, Y. T., Weiss, A., Langer, N., Wang, J. Z., Mao, R. Q., Tang, X. D., Yang, W., Ao, Y. P., Wang, M.
Publikováno v:
A&A 679, L6 (2023)
Sulfur isotope ratios have emerged as a promising tool for tracing stellar nucleosynthesis, quantifying stellar populations, and investigating the chemical evolution of galaxies. While extensively studied in the Milky Way, in extragalactic environmen
Externí odkaz:
http://arxiv.org/abs/2309.15155
Autor:
Wang, Y. X., Zhang, J. S., Yu, H. Z., Wang, Y., Yan, Y. T., Chen, J. L., Zhao, J. Y., Zou, Y. P.
Publikováno v:
2023ApJS..264...48W
We conducted observations of multiple HC3N (J = 10-9, 12-11, and 16-15) lines and the N2H+ (J = 1-0) line toward a large sample of 61 ultracompact (UC) H II regions, through the Institutde Radioastronomie Millmetrique 30 m and the Arizona Radio Obser
Externí odkaz:
http://arxiv.org/abs/2302.09577
Autor:
Yan, Y. T., Henkel, C., Kobayashi, C., Menten, K. M., Gong, Y., Zhang, J. S., Yu, H. Z., Yang, K., Xie, J. J., Wang, Y. X.
Publikováno v:
A&A 670, A98 (2023)
With the IRAM 30 meter telescope, we performed observations of the $J$ = 2-1 transitions of CS, C$^{33}$S, C$^{34}$S, C$^{36}$S, $^{13}$CS, $^{13}$C$^{33}$S, and $^{13}$C$^{34}$S as well as the $J$ = 3-2 transitions of C$^{33}$S, C$^{34}$S, C$^{36}$S
Externí odkaz:
http://arxiv.org/abs/2212.03252
Autor:
Yan, Y. T., Henkel, C., Menten, K. M., Gong, Y., Nguyen, H., Ott, J., Ginsburg, A., Wilson, T. L., Brunthaler, A., Belloche, A., Zhang, J. S., Budaiev, N., Jeff, D.
Publikováno v:
A&A 666, L15 (2022)
We report the discovery of widespread maser emission in non-metastable inversion transitions of NH$_3$ toward various parts of the Sagittarius B2 molecular cloud/star forming region complex: We detect masers in the $J,K = $ (6,3), (7,4), (8,5), (9,6)
Externí odkaz:
http://arxiv.org/abs/2209.11786
Autor:
Chen, J. L., Zhang, J. S., Henkel, C., Yan, Y. T., Yu, H. Z., Qiu, J. J., Tang, X. D., Wang, J., Liu, W., Wang, Y. X., Zheng, Y. H., Zhao, J. Y., Zou, Y. P.
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 the Galactic chemical evolution. The (J, K ) = (1, 1), (2, 2), and (3,
Externí odkaz:
http://arxiv.org/abs/2208.03977