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Title: ALMA OBSERVATIONS OF THE IRDC CLUMP G34.43+00.24 MM3: HOT CORE AND MOLECULAR OUTFLOWS

We have observed a cluster forming clump (MM3) associated with the infrared dark cloud G34.43+00.24 in the 1.3 mm continuum and the CH{sub 3}OH, CS, {sup 13}CS, SiO, CH{sub 3}CH{sub 2}CN, and HCOOCH{sub 3} lines with the Atacama Large Millimeter/submillimeter Array and in K-band with the Keck telescope. We have found a young outflow toward the center of this clump in the SiO, CS, and CH{sub 3}OH lines. This outflow is likely driven by a protostar embedded in a hot core, which is traced by the CH{sub 3}CH{sub 2}CN, HCOOCH{sub 3}, {sup 13}CS, and high excitation CH{sub 3}OH lines. The size of the hot core is about 800 × 300 AU in spite of its low mass (<1.1 M {sub ☉}), suggesting a high accretion rate or the presence of multiple star system harboring a few hot corinos. The outflow is highly collimated, and the dynamical timescale is estimated to be less than 740 yr. In addition, we have also detected extended emission of SiO, CS, and CH{sub 3}OH, which is not associated with the hot core and the outflow. This emission may be related to past star formation activity in the clump. Although G34.43+00.24 MM3 is surrounded by amore » dark feature in infrared, it has already experienced active formation of low-mass stars in an early stage of clump evolution.« less
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. Department of Physics, Graduate School of Science, The University of Tokyo, Tokyo 113-0033 (Japan)
  3. Yale Center for Astronomy and Astrophysics, Yale University, New Haven, CT 06520 (United States)
  4. Institute for Astrophysical Research, Boston University, Boston, MA 02215 (United States)
  5. W. M. Keck Observatory, 65-1120 Mamalahoa Highway, Kamuela, HI 96743 (United States)
  6. Department of Earth and Planetary Sciences, Kobe University, Kobe 657-8501 (Japan)
  7. National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo 181-8588 (Japan)
Publication Date:
OSTI Identifier:
22215443
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 775; 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; CARBON 13; EMISSION; EVOLUTION; EXCITATION; MASS; METHANOL; MOLECULES; SILICON OXIDES; STARS; TELESCOPES