Search: id:"swepub:oai:research.chalmers.se:f66ba4b3-1ad9-478a-8b94-0215688e5897" >
The ALMA Survey of ...
The ALMA Survey of 70 mu m Dark High-mass Clumps in Early Stages (ASHES). II. Molecular Outflows in the Extreme Early Stages of Protocluster Formation
-
- Li, Shanghuo (author)
- Chinese Academy of Sciences,Korea Astronomy and Space Science Institute,Harvard-Smithsonian Center for Astrophysics
-
- Sanhueza, Patricio (author)
- National Institutes of Natural Sciences (NINS),The Graduate University for Advanced Studies (SOKENDAI)
-
- Zhang, Qizhou (author)
- Harvard-Smithsonian Center for Astrophysics
-
show more...
-
- Nakamura, Fumitaka (author)
- The Graduate University for Advanced Studies (SOKENDAI),National Institutes of Natural Sciences (NINS)
-
- Lu, Xing (author)
- National Institutes of Natural Sciences (NINS)
-
- Wang, Junzhi (author)
- Chinese Academy of Sciences
-
- Liu, Tie (author)
- Chinese Academy of Sciences
-
- Tatematsu, Ken'ichi (author)
- National Institutes of Natural Sciences (NINS)
-
- Jackson, James M. (author)
- NASA Ames Research Center
-
- Silva, Andrea (author)
- National Institutes of Natural Sciences (NINS)
-
- Guzman, Andres E. (author)
- National Institutes of Natural Sciences (NINS)
-
- Sakai, Takeshi (author)
- University of Electro-Communications
-
- Izumi, Natsuko (author)
- National Institutes of Natural Sciences (NINS),Ibaraki University
-
- Tafoya, Daniel, 1981 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
-
- Li, Fei (author)
- Chinese Academy of Sciences
-
- Contreras, Yanett (author)
- Universiteit Leiden (UL),Leiden University (UL)
-
- Morii, Kaho (author)
- University of Tokyo, Japan,National Institutes of Natural Sciences (NINS)
-
- Kim, Kee-Tae (author)
- Korea Astronomy and Space Science Institute,University of Science and Technology (UST)
-
show less...
-
(creator_code:org_t)
- 2020-11-09
- 2020
- English.
-
In: Astrophysical Journal. - : American Astronomical Society. - 1538-4357 .- 0004-637X. ; 903:2
- Related links:
-
https://iopscience.i...
-
show more...
-
https://doi.org/10.3...
-
https://research.cha...
-
show less...
Abstract
Subject headings
Close
- We present a study of outflows at extremely early stages of high-mass star formation obtained from the ALMA Survey of 70 mu m dark High-mass clumps in Early Stages (ASHES). Twelve massive 3.6-70 mu m dark prestellar clump candidates were observed with the Atacama Large Millimeter/submillimeter Array (ALMA) in Band 6. Forty-three outflows are identified toward 41 out of 301 dense cores using the CO and SiO emission lines, yielding a detection rate of 14%. We discover six episodic molecular outflows associated with low- to high-mass cores, indicating that episodic outflows (and therefore episodic accretion) begin at extremely early stages of protostellar evolution for a range of core masses. The time span between consecutive ejection events is much smaller than those found in more evolved stages, which indicates that the ejection episodicity timescale is likely not constant over time. The estimated outflow dynamical timescale appears to increase with core masses, which likely indicates that more massive cores have longer accretion timescales than less massive cores. The lower accretion rates in these 70 mu m dark objects compared to the more evolved protostars indicate that the accretion rates increase with time. The total outflow energy rate is smaller than the turbulent energy dissipation rate, which suggests that outflow-induced turbulence cannot sustain the internal clump turbulence at the current epoch. We often detect thermal SiO emission within these 70 mu m dark clumps that is unrelated to CO outflows. This SiO emission could be produced by collisions, intersection flows, undetected protostars, or other motions.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)
Keyword
- Massive stars
- Protoclusters
- Protostars
- Star formation
- Infrared dark clouds
- Interstellar line emission
- Interstellar medium
- Stellar jets
- Stellar winds
Publication and Content Type
- art (subject category)
- ref (subject category)
Find in a library
To the university's database
- By the author/editor
-
Li, Shanghuo
-
Sanhueza, Patric ...
-
Zhang, Qizhou
-
Nakamura, Fumita ...
-
Lu, Xing
-
Wang, Junzhi
-
show more...
-
Liu, Tie
-
Tatematsu, Ken'i ...
-
Jackson, James M ...
-
Silva, Andrea
-
Guzman, Andres E ...
-
Sakai, Takeshi
-
Izumi, Natsuko
-
Tafoya, Daniel, ...
-
Li, Fei
-
Contreras, Yanet ...
-
Morii, Kaho
-
Kim, Kee-Tae
-
show less...
- About the subject
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Earth and Relate ...
-
and Meteorology and ...
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Physical Science ...
-
and Astronomy Astrop ...
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Earth and Relate ...
-
and Environmental Sc ...
- Articles in the publication
-
Astrophysical Jo ...
- By the university
-
Chalmers University of Technology