1. Instituto de Física y Astronomía, Universidad de Valparaíso, Avda. Gran Bretaña 1111 Valparaíso, Chile
2. Chinese Academy of Sciences South America Center for Astronomy, China-Chile Joint Center for Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
3. CAS Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Hefei 230026, China
4. School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, China
5. Steward Observatory, University of Arizona, 933 N. Cherry Avenue, Tucson, AZ 85721, USA
6. European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Santiago 19, Chile
7. Purple Mountain Observatory/Key Lab of Radio Astronomy, Chinese Academy of Sciences, Nanjing 210008, China
8. Institute d'Astrophysique Spatiale, CNRS, Univ. Paris-Sud, Université Paris-Saclay, Bât. 121, F-91405 Orsay Cedex, France