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Title: ALMA OBSERVATIONS OF THE IRDC CLUMP G34.43+00.24 MM3: 278 GHz CLASS I METHANOL MASERS

We have observed a molecular clump (MM3) associated with the infrared dark cloud G34.43+00.24 in the CH{sub 3}OH J{sub K}  = 9{sub –1}-8{sub 0} E, 5{sub 0}-4{sub 0} E, and 5{sub –1}-4{sub –1} E lines at sub-arcsecond resolution by using the Atacama Large Millimeter/submillimeter Array. By comparing the CH{sub 3}OH J{sub K}  = 9{sub –1}-8{sub 0} E emission with the CH{sub 3}OH 5{sub 0}-4{sub 0} E and 5{sub –1}-4{sub –1} E emission, we have found that the CH{sub 3}OH J{sub K}  = 9{sub –1}-8{sub 0} E emission is masing. We have clearly shown that the CH{sub 3}OH J{sub K}  = 9{sub –1}-8{sub 0} masers arise from the post shocked gas in the interacting regions between the outflows and ambient dense gas. Toward the strongest peak of the CH{sub 3}OH maser emission, SiO J = 6-5 emission is very weak. This indicates that the CH{sub 3}OH maser emission traces relatively old shocks or weak shocks.
Authors:
;  [1] ; ;  [2] ; ;  [3] ;  [4] ;  [5] ;  [6] ;  [7]
  1. Graduate School of Informatics and Engineering, The University of Electro-Communications, Chofu, Tokyo 182-8585 (Japan)
  2. National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo 181-8588 (Japan)
  3. Department of Physics, Graduate School of Science, The University of Tokyo, Tokyo 113-0033 (Japan)
  4. Yale Center for Astronomy and Astrophysics, Yale University, New Haven, CT 06520 (United States)
  5. Institute for Astrophysical Research, Boston University, Boston, MA 02215 (United States)
  6. Leiden Observatory, P.O. Box 9513, 2300 RA Leiden (Netherlands)
  7. Department of Earth and Planetary Sciences, Kobe University, Kobe 657-8501 (Japan)
Publication Date:
OSTI Identifier:
22364939
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 794; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COMPARATIVE EVALUATIONS; EMISSION; GHZ RANGE; INFRARED RADIATION; MASERS; METHANOL; MOLECULES; PHOTON EMISSION; RESOLUTION; SILICON OXIDES; STARS